Health & Fitness

By Dr. Mercola

Reaching puberty is a rite of passage that we've all been through, but children are now reaching it earlier than ever before, and while precocious puberty in girls has received most of the attention, we now know the trend applies to boys as well.

In the 19th century, the onset of menstruation in girls occurred around the age of 15. Now the average age of the first period is around 12. Some girls develop breasts as early as age seven¹ .

According to a recent study in the journal Pediatrics², boys are now beginning sexual development anywhere from six months to two years earlier than the medically accepted standard based on previous studies.

African-American boys were found to hit the onset of puberty the soonest, starting around the age of nine. Caucasian and Hispanic boys begin developing around the age of 10.

"The causes and public health implications of this apparent shift in US boys to a lower age of onset for the development of secondary sexual characteristics in US boys needs further exploration," the authors write.

Indeed, while some may shrug off the trend of earlier maturation, it's actually pretty significant, as it can affect both physical and psychological health in a number of ways, including raising the future risk for hormone-related cancers. Girls who enter puberty earlier are at an increased risk of breast cancer, for example, due to the early rise in estrogen.

The trend also raises serious questions about environmental factors spurring this development. Lead researcher Marcia Herman-Giddens told CNN Health³:

"The changes are too fast. Genetics take maybe hundreds, thousands of years. You have to look at something in the environment. That would include everything from (a lack of) exercise to junk food to TV to chemicals."

Environmental Chemicals a Likely Factor

Scientists have brought forth a number of potential explanations for the rising rates of early puberty, but one that deserves special attention is environmental chemicals, and particularly xeno-estrogens, i.e. estrogen-mimicking chemicals. These compounds behave like steroid hormones and can alter the timing of puberty, and affect disease risk throughout life.

In adults, xeno-estrogens have been linked to decreased sperm quality, stimulation of mammary gland development in men, disrupted reproductive cycles and ovarian dysfunction, obesity, cancer and heart disease, among numerous other health problems.

We're surrounded by hormone-disrupting chemicals these days, many of which are plasticizers. Bisphenol A (BPA) for example, is an industrial petrochemical that acts as a synthetic estrogen, and can be found plastics and tin can linings, in dental sealants, and on cash-register receipts. Three years ago, laboratory tests commissioned by the Environmental Working Group (EWG) detected BPA in the umbilical cord blood of 90 percent of newborn infants tested -- along with more than 230 other chemicals!

In September 2010, Canada declared BPA a toxic substance, but to date no other country has followed suit, although BPA has been banned in baby bottles in Canada, Europe and the United States. Frustratingly, the US FDA has denied the request to ban BPA, however many American companies have voluntarily removed the chemical from their products, in response to consumer demand. So, if you check around, you can find a lot of BPA-free products.

However, buyer beware, as it recently came to light that some companies are simply replacing the offending BPA with another less known but equally toxic chemical called bisphenol-S (BPS)! Not only does BPS appear to have similar hormone-mimicking characteristics to BPA, but research suggests it is actually significantly less biodegradable, and more heat-stable and photo-resistant, than BPA.

10 Top Offenders that Can Disrupt Your Hormones

Beside BPA and BPS, other top offenders you should be aware of, and watch out for, include:

Phthalates, a group of industrial chemicals used to make plastics like polyvinyl chloride (PVC) more flexible and resilient. They're also one of the most pervasive of the endocrine disrupters, found in everything from processed food packaging and shower curtains to detergents, toys and beauty products like nail polish, hair spray, shampoo, deodorants, and fragrances. Exposure to phthalates can lead to incomplete testicular descent in fetuses, reduced sperm counts, testicular atrophy or structural abnormality and inflammation in newborns.	Fluoride, which is added to the majority of public water supplies in the United States. Research has shown that animals treated with fluoride had lower levels of circulating melatonin, as reflected by reduced levels of melatonin metabolites in the animals' urine. This reduced level of circulating melatonin was accompanied -- as might be expected -- by an earlier onset of puberty in the fluoride-treated female animals.
Perfluorooctanoic acid (PFOA), a likely carcinogen found in grease- and water-resistant coatings and non-stick cookware.	Methoxychlor and Vinclozin, an insecticide and a fungicide respectively, have been found to cause changes to male mice born for as many as four subsequent generations after the initial exposure.
Nonylphenol ethoxylates (NPEs). Known to be potent endocrine disrupters, these chemicals affect gene expression by turning on or off certain genes, and interfere with the way your glandular system works.	Bovine growth hormones (rBGH) commonly added to commercial dairy have been implicated as a contributor to premature adolescence.
MSG, a food additive that's been linked to reduced fertility.	Non-fermented soy products, which are loaded with hormone-like substances.
DDE (a breakdown product of the pesticide DDT)	PCBs

New Concern: Metalloestrogens

Recent research has also confirmed the existence of a previously unknown class of cancer-causing estrogen-mimicking compounds: "metalloestrogens." The following metals, which are added to thousands of consumer products, including vaccines, have been identified as being capable of binding to cellular estrogen receptors and then mimicking the actions of physiological estrogens:⁴

Aluminum	Antimony	Arsenite	Barium	Cadmium	Chromium	Cobalt
Copper	Lead	Mercury	Nickel	Selenite	Tin	Vanadate

Tips to Reduce Exposure to Hormone-Disrupting Substances

While young girls and boys may show obvious signs of exposure to hormone-disrupting substances via early puberty, other signals are more insidious and may not show up until a disease is already present. You can cut back on your family's exposure to these dangerous chemicals by following these 12 guidelines. Pregnant women and women who may become pregnant should pay particular attention to reducing their exposure as much as possible to protect the health of their unborn baby:

1. Eat whole, preferably organic, produce and free-range, organic meats to reduce your exposure to added hormones, pesticides and fertilizers. Also avoid milk and other dairy products that contain the genetically engineered recombinant bovine growth hormone (rBGH or rBST)
2. Eat mostly raw, fresh foods. Processed, prepackaged foods (of all kinds) are a major source of soy and chemicals such as BPA and phthalates.
3. Store your food and beverages in glass rather than plastic, and avoid using plastic wrap and canned foods (which are often lined with BPA-containing liners).
4. Use glass baby bottles and BPA-free sippy cups for your little ones.
5. Make sure your baby's toys are BPA-free, such as pacifiers, teething rings and anything your child may be prone to suck on.
6. Only use natural cleaning products in your home to avoid phthalates.
7. Switch over to natural brands of toiletries such as shampoo, toothpaste, antiperspirants and cosmetics. The Environmental Working Group's Skin Deep Database⁵ is a great resource for finding personal care products that are free of phthalates, parabens and other potentially dangerous chemicals.
8. Avoid using artificial air fresheners, dryer sheets, fabric softeners or other synthetic fragrances.
9. Replace your non-stick pots and pans with ceramic or glass cookware.
10. When redoing your home, look for "green," toxin-free alternatives in lieu of regular paint and vinyl floor coverings.
11. Replace your vinyl shower curtain with one made of fabric.
12. Avoid non-fermented soy, especially if you're pregnant. Also, never use soy-based infant formula.

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By Dr. Mercola

Reaching puberty is a rite of passage that we've all been through, but children nowadays are reaching it earlier than ever before -- a trend that has both health experts and parents alarmed.

Precocious puberty, which is the appearance of secondary sex characteristics like pubic hair or breast growth before age 8, or the onset of menarche before age 9, impacts at least 1 in 5,000 U.S. children, and the rate is on the rise.¹

Even in the last three decades, children (particularly girls) are maturing at younger and younger ages (precocious puberty is 10 times more common in girls than in boys).

Puberty, Once the Norm at Age 15, Now Occurring in 7-, 8- and 9-Year-Olds

In the 19th century the onset of menstruation occurred around the age of 15. Now the average age of the first period, or menarche, is around 12. The time during and before puberty is one of rapid development and change, which is why even months matter when it comes to first menstruation. Before menstruation, girls will show beginning signs of development, such as breast "budding" and growth of pubic hair.

These signs are now becoming unsettlingly common among 7-, 8- and 9-year-old girls, to the extent that many health care providers, rather than labeling these children with a diagnosis that something is wrong, have simply changed the definition of what's normal... but is it really "normal" for girls to mature at such a young age?

There are more questions than answers in the case of precocious puberty, but what is certain is that girls are developing earlier than they have even 10, 20 or 30 years ago.

One study in the journal Pediatrics revealed that by age 7, 10 percent of white girls, 23 percent of black girls, 15 percent of Hispanic girls and 2 percent of Asian girls had started developing breasts, with researchers noting:²

"The proportion of girls who had breast development at ages 7 and 8 years, particularly among white girls, is greater than that reported from studies of girls who were born 10 to 30 years earlier."

Early puberty can set the stage for emotional and behavioral problems, and is linked to lower self-esteem, depression, eating disorders, alcohol use, earlier loss of virginity, more sexual partners and increased risk of sexually transmitted diseases. There is also evidence that suggests these girls are at increased risk of diabetes, heart disease and other cardiovascular diseases, as well as cancer, later in life.

Environmental Chemicals a Likely Factor

Scientists have brought forth a number of potential explanations for the rising rates of early puberty, but one that deserves special attention is environmental chemicals, and particularly estrogen-mimicking, "gender-bending" chemicals that easily leach out of the products that contain them, contaminating everything they touch, including food and beverages.

As the featured New York Times article reported:

" ...animal studies show that the exposure to some environmental chemicals can cause bodies to mature early. Of particular concern are endocrine-disrupters, like "xeno-estrogens" or estrogen mimics. These compounds behave like steroid hormones and can alter puberty timing.

For obvious ethical reasons, scientists cannot perform controlled studies proving the direct impact of these chemicals on children, so researchers instead look for so-called "natural experiments," one of which occurred in 1973 in Michigan, when cattle were accidentally fed grain contaminated with an estrogen-mimicking chemical, the flame retardant PBB.

The daughters born to the pregnant women who ate the PBB-laced meat and drank the PBB-laced milk started menstruating significantly earlier than their peers."

This is an extreme case, but the truth is we are all part of a "secret experiment" of sorts, because hormone-disrupting chemicals are all around us. Bisphenol A (BPA), an industrial petrochemical that acts as a synthetic estrogen, is found in our plastics and our tin can linings, in dental sealants and on cash-register receipts. Laboratory tests commissioned by the Environmental Working Group (EWG) detected BPA in the umbilical cord blood of 90 percent of newborn infants tested -- along with more than 230 other chemicals. As written in the New York Times:

"One concern, among parents and researchers, is the effect of simultaneous exposures to many estrogen-mimics, including the compound BPA, which is ubiquitous."

No one knows what happens when a developing fetus or young child is exposed to hundreds of chemicals, many of which mimic your body's natural hormones and can trigger major changes in your body even as an adult, let along during the most rapid and vulnerable periods of development (in utero and as a young child).

BPA is, unfortunately, but one example. Others include phthalates, a group of industrial chemicals used to make plastics like polyvinyl chloride (PVC) more flexible and resilient. They're also one of the most pervasive of the endocrine disrupters, found in everything from processed food packaging and shower curtains to detergents, toys and beauty products like nail polish, hair spray, shampoo, deodorants, and fragrances.

Other environmental chemicals like PCBs and DDE (a breakdown product of the pesticide DDT) may also be associated with early sexual development in girls. Both DDE and PCBs are known to mimic, or interfere with, sex hormones.

Perfluorooctanoic acid (PFOA), found in non-stick cookware, also falls into this dangerous category, as does fluoride, which is added to the majority of public water supplies in the United States. Research showed that animals treated with fluoride had lower levels of circulating melatonin, as reflected by reduced levels of melatonin metabolites in the animals' urine. This reduced level of circulating melatonin was accompanied -- as might be expected -- by an earlier onset of puberty in the fluoride-treated female animals.

These Chemicals Also Increase Your Risk of Cancer and Heart Disease

If a chemical is capable of influencing the rate of your reproductive development, it stands to reason that it would be capable of influencing other hormone-sensitive growth processes as well, and this is indeed the case.

For instance, new research has detected the presence of paraben esters in 99 percent of breast cancer tissues sampled.³ Parabens are chemicals with estrogen-like properties, and estrogen is one of the hormones involved in not only puberty but also the development of breast cancer. They are widely used in household products such as:

✓ Deodorants and antiperspirants	✓ Shampoos and conditioners	✓ Shaving gel	✓ Toothpaste
✓ Lotions and sunscreens	✓ Make-up / cosmetics	✓ Pharmaceutical drugs	✓ Food additives

Recent research has also confirmed the existence of a previously unknown class of cancer-causing estrogen-mimicking compounds: metals. Yes, a broad range of metals have been shown to act as "metalloestrogens" with the potential to add to the estrogenic burden of the human body, thereby increasing the risk of breast cancer and also possibly early puberty. The following metals, which are added to thousands of consumer products, including vaccines, have been identified as being capable of binding to cellular estrogen receptors and then mimicking the actions of physiological estrogens:⁴

✓ Aluminum	✓ Antimony	✓ Arsenite	✓ Barium	✓ Cadmium	✓ Chromium	✓ Cobalt
✓ Copper	✓ Lead	✓ Mercury	✓ Nickel	✓ Selenite	✓ Tin	✓ Vanadate

Data from a long-running British health survey, meanwhile, has shown that if you have high levels of the chemical BPA in your urine, you may be at an increased risk of heart disease. Some of the greatest concern surrounds early-life, in utero exposure to BPA, which can lead to chromosomal errors in your developing fetus, causing spontaneous miscarriages and genetic damage. But evidence is also very strong showing these chemicals are influencing adults and children, too, and leading to decreased sperm quality, early puberty, stimulation of mammary gland development, disrupted reproductive cycles and ovarian dysfunction, obesity, cancer and heart disease, among numerous other health problems.

Avoiding Hormone-Disrupting Substances is Crucial for Children and Adults Alike

While young girls may show obvious signs of exposure to hormone-disrupting substances via early puberty, other signals are more insidious and may not show up until a disease is already present. Here are 11 measures you can implement right away to help protect yourself and your children from common toxic substances that could cause precocious puberty and other long-term health problems:

1. As much as possible, buy and eat organic produce and free-range, organic meats to reduce your exposure to added hormones, pesticides and fertilizers. Also avoid milk and other dairy products that contain the genetically engineered recombinant bovine growth hormone (rBGH or rBST)
2. Eat mostly raw, fresh foods. Processed, prepackaged foods (of all kinds) are a major source of soy and chemicals such as BPA and phthalates.
3. Store your food and beverages in glass rather than plastic, and avoid using plastic wrap and canned foods (which are often lined with BPA-containing liners).
4. Use glass baby bottles and BPA-free sippy cups for your little ones.
5. Make sure your baby's toys are BPA-free, such as pacifiers, teething rings and anything your child may be prone to suck on.
6. Only use natural cleaning products in your home to avoid phthalates.
7. Switch over to natural brands of toiletries such as shampoo, toothpaste, antiperspirants and cosmetics. The Environmental Working Group has a great safety guide to help you find personal care products that are free of phthalates, parabens and other potentially dangerous chemicals.
8. Avoid using artificial air fresheners, dryer sheets, fabric softeners or other synthetic fragrances, many of which can also disrupt your hormone balance.
9. Replace your non-stick pots and pans with ceramic or glass cookware.
10. When redoing your home, look for "green," toxin-free alternatives in lieu of regular paint and vinyl floor coverings.
11. Replace your vinyl shower curtain with one made of fabric.
12. Avoid non-fermented soy, especially if you're pregnant and in infant formula.

Theo Colburn's book Our Stolen Future is a great source for further investigation as it identifies the numerous ways in which environmental pollutants are disrupting human reproductive patterns. I believe it is one of the best resources on this topic and highly recommend it.

Vitamin D Also Linked to Early Puberty

It has been suggested that girls who live closer to the equator start puberty at a later age than girls who live in Northern regions. Since this indicates a potential connection with sun exposure, researchers decided to investigate whether vitamin D was, in fact, related. Upon measuring vitamin D levels in 242 girls aged 5-12, researchers from the University of Michigan School of Public Health found that those who were deficient were twice as likely to start menstruation during the study period as those with higher levels.⁵

Specifically, among the vitamin-D-deficient girls, 57 percent started their period during the study, compared to 23 percent with adequate vitamin D. However, researchers defined adequate vitamin D as ≥ 30 ng/mL, which is actually still a deficiency state! For optimal health, vitamin D levels should be a minimum of 50 ng/mL, which means the number of vitamin-D-deficient girls with early puberty was probably much higher than the study reported.

The earlier you enter puberty, the longer you're exposed to elevated levels of the female hormone estrogen, which is a risk factor for certain cancers such as breast cancer. This has been the primary "link" between early puberty and cancer that has been explored, but it's important to understand that vitamin D deficiency is also a major risk factor for cancer, heart disease and many other diseases. So it could be that some of the increased risks that come from early puberty are linked to low vitamin D levels.

What You Should Know About Obesity, Stress and Exercise

Obesity (which exposes girls to more estrogen because estrogen is both stored and produced in fat tissue) is another likely factor in early puberty. The New York Times reported:

"As Robert Lustig, a professor of clinical pediatrics at the University of California, San Francisco's Benioff Children's Hospital, explains, fatter girls have higher levels of the hormone leptin, which can lead to early puberty, which leads to higher estrogen levels, which leads to greater insulin resistance, causing girls to have yet more fat tissue, more leptin and more estrogen, the cycle feeding on itself, until their bodies physically mature."

As for stress, this, too, has been linked to early puberty, with girls whose parents divorced when they were between 3- and 8-years-old significantly more likely to experience precocious puberty. "Evolutionary psychology offers a theory," the New York Times reports. "A stressful childhood inclines a body toward early reproduction; if life is hard, best to mature young. But such theories are tough to prove." Interestingly, in addition to avoiding environmental chemicals, obesity and stress, and optimizing your vitamin D, regular exercise appears to be one of the best known ways to help prevent early puberty.

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As plastic ages or is exposed to heat or stress, it can release trace amounts of some of its ingredients. Of particular concern are bisphenol-a (BPA), used to strengthen some plastics, and phthalates, used to soften others.

These chemicals are used in hundreds of household items; BPA is in everything from baby bottles to can linings, while phthalates are found in children‘s toys as well as vinyl shower curtains. They enter your body through the food, water and bits of dust you consume, or are simply absorbed through your skin.

BPA and phthalates are endocrine disrupters, which mimic hormones. Estrogen and other hormones in relatively tiny amounts can cause vast changes, so researchers worry that BPA and phthalates could do the same, especially in young children.

To cut down on your exposure, avoid plastic bottles and toys labeled with the numbers 3 or 7, which often contain BPA or phthalates, and canned foods, especially those with acidic contents like tomatoes. You should also avoid heating plastic in microwaves.

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More than three decades of scientific research suggests that repeatedly telling children that they are especially smart or talented leaves them vulnerable to failure, and fearful of challenges.

Children raised this way develop an implicit belief that intelligence is innate and fixed, making striving to learn seem less important than seeming smart; challenges, mistakes, and effort become threats to their ego rather than opportunities to improve.

However, teaching children to have a “growth mind-set,” which encourages effort rather than on intelligence or talent, helps make them into high achievers in school and in life. This results in “mastery-oriented” children who tend to think that intelligence is malleable and can be developed through education and hard work.

This can be done by telling stories about achievements that result from hard work. Talking about math geniuses who were born that way puts students in a fixed mind-set, but descriptions of great mathematicians who developed amazing skills over time creates a growth mind-set.

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More than 80 percent of schools in America use toxic pesticides as a preventative measure, whether it‘s needed or not.

Mark Lame, an entomologist and professor at Indiana University‘s School of Public and Environmental Affairs, believes this is an entirely unnecessary practice that carries more risks than benefits to students and faculty.

The most widely used pesticides are, in fact, nerve poisons. They cause uncontrolled nerve firing, and disrupt the delicate hormone systems.

The link between pesticide exposure and health problems in children is already well established. Research has connected these endocrine-disrupting pesticides to health problems such as ADHD, autism, and infertility -- all of which are on the rise.

Professor Lame says pest problems are better managed through an integrated approach -- by preventing the conditions that attract pests into school facilities in the first place.

Lame serves as a consultant for schools around the country, helping them reduce the toxic load by implementing his Integrated Pest Management (IPM) process.

Science Daily July 21, 2007

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Chrissy Teigen has thrown diet culture out the window and is now focusing on the things that make her happy. And we are bowing down to our queen.

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A new study helps to explain how leptin, a hormone produced by fat tissue, influences your motivation to eat.

The researchers described for the first time a collection of leptin-responsive neurons in the brain's lateral hypothalamic area (LHA). Those LHA neurons feed directly into the mesolimbic dopamine system, which controls the rewarding properties assigned to things.

The study therefore adds to growing evidence that leptin doesn't turn your appetite on and off just by controlling whether you feel hungry or full. It can also make you want food more or less regardless of hunger.

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By Ron Rosedale, M.D.

It is amazing how the little twists and turns of researchers can have such a profound impact on what we generally come to realize as “scientific truth.” Let me share a recent fascinating example of how this impacted one of the most powerful hormones in your body.

The Ob mouse is a strain of mouse that has a genetic mutation that makes it obese and unhealthy. It has been used for many years as a model of obesity to do research on, though the reason that it was obese had eluded scientists.

This changed when, in 1994, Jeffrey Friedman discovered that this mouse lacked a previously unknown hormone called leptin, and when it was injected with leptin it became thin, vibrant, and very healthy within weeks. This made headlines around the world, "the cure for obesity found" and pharmaceutical companies started tripping over themselves with trillion dollar signs in their eyes to be the first to genetically manufacture leptin on a large-scale.

This did not last long. When people were tested for leptin, it was found that, unlike the Ob mouse, they did not lack leptin; on the contrary almost all overweight and obese people have excess leptin.

These people were ^"leptin resistant^" and giving extra leptin did little good.

The financial disappointment was extreme and scientists working for pharmaceutical companies said that leptin wasn't important anymore since they could not find a drug to control it, and therefore the industry couldn't make money on it. To make big money in medicine one needs a patent and this generally means remedies which are not commonly or easily available -- that are not natural.

This illustrates two extremely unfortunate principles in modern medicine; only those therapies that will make lots of money (generally for the pharmaceutical industry or hospitals), ever get pursued and then taught to physicians (since most of medical education after medical school takes place by drug reps), and these therapies, almost by definition, will be unnatural.

This inhibition of extremely important knowledge is not only unfortunate, it is deadly, and is exemplified by how few people, including doctors, know anything about leptin, though I would consider it to be the most important chemical in your body that will determine your health and lifespan.

Two Hormones that are Vital for Optimal Health

Each and every one of us is a combination of lives within lives. We are made up of trillions of individual living cells that each must maintain itself. Even more significantly, the cells must communicate and interact with each other to form a republic of cells that we call our individual self.

Our health and life depends on how accurately instructions are conveyed to our cells so that they can act in harmony. It is the communication among the individual cells that will determine our health and our life.

The communication takes place by hormones. Arguably therefore, the most important molecules in your body that ultimately will decide your health and life are hormones.

Many would say that genes and chromosomes are the most important molecules, however once born your genes pretty much just sit there; hormones tell them what to do. Certainly, the most important message that our cells receive is how and what to do with energy, and therefore life cannot take place without that.

The two most important hormones that deliver messages about energy and metabolism are insulin and leptin.

Metabolism can roughly be defined as the chemistry that turns food into life, and therefore insulin and leptin are critical to health and disease. Both insulin and leptin work together to control the quality of your metabolism (and, to a significant extent, the rate of metabolism).

Insulin works mostly at the individual cell level, telling the vast majority of cells whether to burn or store fat or sugar and whether to utilize that energy for maintenance and repair or reproduction. This is extremely important as we shall see, for on an individual cell level turning on maintenance and repair equates to increased longevity, and turning up cellular reproduction can increase your risk of cancer.

Leptin, on the other hand, controls the energy storage and utilization of the entire republic of cells allowing the body to communicate with the brain about how much energy (fat) the republic has stored, and whether it needs more, or should burn some off, and whether it is an advantageous time nutritionally-speaking for the republic --you-- to reproduce or not.

What Exactly is Leptin?

Leptin is a very powerful and influential hormone produced by fat cells that has totally changed the way that science (real science, outside of medicine) looks at fat, nutrition, and metabolism in general.

Prior to leptin^'s discovery, fat was viewed as strictly an ugly energy storage depot that most everyone was trying to get rid of. After it was discovered that fat produced the hormone leptin (and subsequently it was discovered that fat produced other very significant hormones), fat became an endocrine organ like the ovaries, pancreas and pituitary, influencing the rest of the body and, in particular, the brain.

Leptin, as far  as science currently knows, is the most powerful regulator that tells your brain what to do about life's two main biological goals: eating and reproduction. Your fat, by way of leptin, tells your brain whether you should be hungry, eat and make more fat, whether you should reproduce and make babies, or (partly by controlling insulin) whether to "hunker down" and work overtime to maintain and repair yourself.

I believe I could now make a very convincing and scientifically accurate statement that that rather than your brain being in control of the rest of your body, your brain is, in fact, subservient to your fat -- and leptin.

In short, leptin is the way that your fat stores speak to your brain to let your brain know how much energy is available and, very importantly, what to do with it. Therefore, leptin may be "on top of the food chain^" in metabolic importance and relevance to disease.

How Leptin Regulates Your Weight

It has been known for many years that fat stores are highly regulated. It appeared that when one tried to lose weight the body would try to gain it back. This commonly results in "yo-yo" dieting and in scientific circles one talks about the "set point" of weight. It has long been theorized that there must be a hormone that determines this.

Science points now to leptin as being that hormone.

In our ancestral history, it was advantageous to store some fat to call upon during times of famine. However, it was equally disadvantageous to be too fat. For most of our evolutionary history, it was necessary to run, to obtain prey and perhaps most importantly, to avoid being prey. If a lion was chasing a group of people it would most likely catch and eliminate from the gene pool the slowest runner and the one who could not make it up the tree -- the fattest one.

Thus, fat storage had to be highly regulated and this is done, as is any regulation, through hormones, the most significant being leptin.

If a person is getting too fat, the extra fat produces more leptin which is supposed to tell the brain that there is too much fat stored, more should not be stored, and the excess should be burned.

Signals are therefore sent to an area of the brain in the hypothalamus (the arcuate nucleus) to stop being hungry, to stop eating, to stop storing fat and to start burning some extra fat off.

Controlling hunger is a major (though not the only) way that leptin controls energy storage. Hunger is a very powerful, ancient, and deep-seated drive that, if stimulated long enough, will make you eat and store more energy. Asking somebody to not eat, to voluntarily restrict calories even though they are hungry, is asking the near impossible. The only way to eat less in the long-term is to not be hungry, and the only way to do this is to control the hormones that regulate hunger, the primary one being leptin.

How Leptin Resistance Leads to Disease

More recently, it has been found that leptin not only changes brain chemistry, but can also ^"rewire^" the very important areas of the brain that control hunger and metabolism. I'm not aware of any other chemical in the body that has been shown to accomplish this "mind bending" event.

This has really caught the attention of the scientific community. Further studies have now shown that leptin, or more correctly the inability of the body to properly hear leptin^’s signals, in other words leptin resistance, plays significant if not primary roles in heart disease, obesity, diabetes, osteoporosis, autoimmune diseases, reproductive disorders, and perhaps the rate of aging itself.

It helps to control the brain areas that regulate thyroid levels and the sympathetic nervous system which also has huge impacts on blood pressure, heart disease, diabetes, osteoporosis and aging. Leptin's stimulatory effect on the sympathetic nervous system also helps determine the adrenal stress response including cortisol levels.

Leptin May Be Even More Critical Than Insulin

The importance of insulin in health and disease is becoming well-known. Aside from its obvious role in diabetes, it plays a very significant role in hypertension, cardiovascular disease, and cancer.

I was one of the first to speak publicly to doctors about insulin’s critical role in health well over a decade ago (see the transcribed talk Insulin and its Metabolic Effects) and I am even more convinced now.

However leptin may even supersede insulin in importance, for new research is revealing that in the long run glucose and therefore insulin levels may be largely determined by leptin.

It had been previously believed that the insulin sensitivity of muscle and fat tissues were the most important factor in determining whether one would become diabetic or not. Elegant new studies are showing that the brain and liver are most important in regulating a person’s blood sugar levels especially in type 2 or insulin resistant diabetes.

It should be noted again that leptin plays a vital role in regulating your brain^’s hypothalamic activity which in turn regulates much of a person’s ^"autonomic^" functions; those functions that you don't necessarily think about but which determines much of your life (and health) such as body temperature, heart rate, hunger, the stress response, fat burning or storage, reproductive behavior, and newly discovered roles in bone growth and blood sugar levels.

Another very recent study reveals leptin's importance in directly regulating how much sugar that the liver manufactures via gluconeogenesis.

Many chronic diseases are now linked to excess inflammation such as heart disease and diabetes. High leptin levels are very pro-inflammatory, and leptin also helps to mediate the manufacture of other very potent inflammatory chemicals from fat cells that also play a significant role in the progression of heart disease and diabetes. It has long been known that obesity greatly increased risk for many chronic diseases including heart disease and diabetes, but no one really knew why.

Leptin appears to be the missing link.

Could Leptin Also Affect  How Fast You Age?

Leptin will not only determine how much fat you have, but also where that fat is put. When you are leptin resistant you put that fat mostly in your belly, your viscera, causing the so-called "apple shape" that is linked to much disease. Some of that fat permeates the liver, impeding the liver's ability to listen to insulin, and further hastening diabetes.

 

Leptin plays a far more important role in your health than, for instance, cholesterol, yet how many doctors measure leptin levels in their patients, know their own level, even know that it can be easily measured, or even what it would mean?

Leptin appears to play a significant role in obesity, heart disease, osteoporosis, autoimmune diseases, inflammatory diseases and cancer. These are the so-called ^"chronic diseases of aging^".

Could it perhaps affect the rate of aging itself?

The Biology of Aging

Scientists who study the biology of aging are beginning to look at that question. There are two endeavors, two drives that life has been programmed, since its inception, to succeed at and to succumb to. These are to eat and to reproduce.

If every one of our ancestors had not succeeded in eating and reproducing we would not be here, and this paper would be moot. All of your morphological characteristics from your hair to your toenails are designed to help you succeed at those two activities. That is what nature wants us to do. Nature's purpose is not necessarily to have you live a long and healthy life, but to perpetuate the instructions, the genes that tell how to perpetuate life.

Even so-called "paleolithic" diets, though undoubtedly far better than what is generally eaten today, were not necessarily designed by nature to help us live a long and healthy life but, at best, to maximize reproduction. Nature appears to not care much about what happens to us after we have had a sufficient chance to reproduce. That is why we die.

But there are clues as to how to live a long and healthy life. And that brings us once again to fat--and leptin.

It takes energy to make babies; lots of it. Energy was and always will be a coveted commodity. Nature, and evolution, hates wasting it. It makes no sense to try and make babies when it appears that there's not enough energy available to successfully accomplish that goal.

Instead, it seems that virtually all living forms can ^"switch gears^" and direct energy away from reproduction and towards mechanism that will allow it to "hunker down" for the long haul and thus be able to reproduce at a future more nutritionally opportune time. In other words nature will then let you live longer to accomplish its primary directive of reproduction.

It does this by up regulating maintenance and repair genes that increase production of intracellular antioxidant systems, heat shock proteins (that help maintain protein shape), and DNA repair enzymes. This is what happens when you restrict calories (without starvation) in animals, and that has been shown convincingly for 70 years to greatly extend the life span of many dozens of species. Thus, there is a powerful link between reproduction, energy stores, and longevity.

Genetic studies in simple organisms have shown that that link is at least partially mediated by insulin (which in simple organisms also functions as a growth hormone), and that when insulin signals are kept low, indicating scarce energy availability, maximal lifespan can be extended--- a lot; several hundred percent in worms and flies.

Glucose is an ancient fuel used even before there was oxygen in the atmosphere, for life can burn glucose without oxygen; it is an anaerobic fuel. The use of fat as fuel came later, after life in the form of plants soaked the earth in oxygen, for you cannot burn fat without oxygen.

The primary source of energy stores in people by far is fat, as many unfortunately are all too aware of. The primary signal that indicates how much fat is stored is leptin, and it is also leptin that allows for reproduction, or not.

It has long been known that women with very little body fat, such as marathon runners, stop ovulating. There is not enough leptin being produced to permit it. Paradoxically, the first pharmaceutical use of leptin was recently approved to give to skinny women to allow them to reproduce.

Leptin’s Role in Improving Your Metabolism

Leptin also is instrumental in regulating body temperature, partly by controlling the rate of metabolism via its regulation of the thyroid.

 

Metabolic rate and temperature has long been connected with longevity. Almost all mechanisms that extend lifespan in many different organisms result in lower temperature. Flowers are refrigerated at the florist to extend their lifespan. Restricting calories in animals also results in lower temperature, reduced thyroid levels, and longer life.

 

It should be noted that reduced thyroid levels in this case are not synonymous with hypothyroidism. Here, the body is choosing to lower thyroid hormones because the increased efficiency of energy use and hormonal signaling (including perhaps thyroid) is allowing this to happen.

Anything will dissolve faster in hot water than cold water. Extra heat will dissolve, disrupt and disorganize. This is not what I try to do to make someone healthy. It is commonly advised to "increase metabolism" and increase "thermogenesis" for health and weight loss.

Yet how many of you would put a brand of gasoline in your car that advertised that it would make your engine run hotter? What would that do to the life of your car? It is not an increase in metabolism that I am after; it is improved metabolic quality.

That will be determined at the quality of your leptin signaling.

If it is poor, if you are insulin and leptin resistant, your metabolism is unhealthy and high in what I call "metabolic friction". If you then increase its rate you will likely accelerate your demise. To increase the quality of your metabolism you must be able to properly listen to insulin and especially to leptin.

If your fasting blood serum level of leptin is elevated you are likely leptin resistant and you will not be healthy unless you correct it.

How Do You Become Leptin Resistant?

This is the subject of much research. I believe people become leptin-resistant by the same general mechanism that people become insulin-resistant; by overexposure to high levels of the hormone.

High blood glucose levels cause repeated surges in insulin, and this causes one's cells to become "insulin-resistant^" which leads to further high levels of insulin and diabetes. It is much the same as being in a smelly room for a period of time. Soon, you stop being able to smell it, because the signal no longer gets through.

I believe the same happens with leptin. It has been shown that as sugar gets metabolized in fat cells, fat releases surges in leptin, and I believe that those surges result in leptin-resistance just as it results in insulin-resistance.

The only known way to reestablish proper leptin (and insulin) signaling is to prevent those surges, and the only known way to do that is via diet and supplements.

As such, these can have a more profound effect on your health than any other known modality of medical treatment.

When leptin signaling is restored, your brain can finally hear the message that perhaps should have been delivered decades ago; high leptin levels can now scream to your brain that you have too much fat and that you better start burning some off for your life is in danger.

Your brain will finally allow you access into your pantry that you have been storing your fat in. Your cells will be fed the food from that fat and they will be satisfied. They will not know whether that food came from your belly fat or from your mouth; nor will they care. They will be receiving energy that they need and will not have to ask for more. You will not be hungry.

This also makes counting calories irrelevant, for the calories that you put into your mouth today are not necessarily what your cells will be eating; that will be determined primarily by leptin. Whether or not you put food into your mouth, your cells will be eating, and if they cannot eat fat they must eat sugar.

Since little sugar is stored, that sugar will be had by making you crave it, or by turning the protein in your muscle and bone into sugar. This contributes in a major way to weakness and osteoporosis. Whether or not this lean tissue wasting happens is determined by your capacity, or incapacity, to burn fat, and that is determined by your ability to listen to leptin.

A strategic diet that emphasizes good fats and avoids blood sugar spikes coupled with targeted supplements (as recommended in my Rosedale Diet and Dr. Mercola’s Take Control of Your Health), will enhance insulin and leptin sensitivity so that you can once again hear their music, allowing your life to be the symphony it was meant to be.

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