Obese teenage boys are at risk for more than diabetes and heart disease, a new study has found. They also have alarmingly low levels of testosterone - between 40 to 50% less than males of the same age with a normal body mass index.
The study, published this week in the journal Clinical Endocrinology, investigated the effect of obesity on testosterone levels in young males.
It has its origins in earlier research, which showed that type II diabetes and obesity in older men are linked to a high rate (25-33%) of hypogonadism, or low testosterone levels. According to the new study, the rate of hypogonadism in type II diabetic men ages 18-35 is greater than 50%.
Obesity can lead to diabetes and heart disease. What’s more, low testosterone can slow or stop sexual maturation — and there’s nothing more hurtful than “a male not having his maleness,” Dandona said.
Originally posted by nidstav
In the common genome that you observe in species after fish there are some lines of code that contain a self-destruct mechanism for species that reach the point of rodent-level. Those will decrease the level of testosterone in populations given that there are no natural signals entering the genome. It's basically a self-destruct mechanism that blocks evolution in one species for the common good of all. It's been activated. Check worldwide decreasing levels of testosterone among newer generations. This is one of the few reasons for optimism for humanity.
HEALTH AND THE ENVIRONMENT: Testosterone Levels Fall Worldwide
By Washington's Blog
Global Research, April 04, 2012
Men’s testosterone levels across all age groups have been plummeting over the last couple of decades, probably due to environmental factors. As Reuters reported in 2006:
A new study has found a “substantial” drop in U.S. men’s testosterone levels since the 1980s, but the reasons for the decline remain unclear. This trend also does not appear to be related to age.
The average levels of the male hormone dropped by 1 percent a year, Dr. Thomas Travison and colleagues from the New England Research Institutes in Watertown, Massachusetts, found. This means that, for example, a 65-year-old man in 2002 would have testosterone levels 15 percent lower than those of a 65-year-old in 1987. This also means that a greater proportion of men in 2002 would have had below-normal testosterone levels than in 1987.
“The entire population is shifting somewhat downward we think,” Travison told Reuters Health. “We’re counting on other studies to confirm this.” Travison and his team analyzed data from the Massachusetts Male Aging Study, a long-term investigation of aging in about 1,700 Boston-area men. Data from the men were collected for three time intervals: 1987-1989, 1995-1997, and 2002-2004.
The researchers observed a speedier decline in average testosterone levels than would have been expected with aging alone.
It’s likely that some sort of environmental exposure is responsible for the testosterone decline, Travison said, although he said attempting to explain what this might be based on the current findings would be “pure conjecture.”
Men’s Health wrote in 2007:
In the summer of 2006, Travison attended an Endocrine Society meeting where another researcher, Antti Perheentupa M.D., Ph.D., from the University of Turku, in Finland, presented evidence of a similar decline. The Finnish results suggested the change was happening among younger men, too. A man born in 1970 had about 20 percent less testosterone at age 35 than a man of his father’s generation at the same age. “When I saw another group reproducing our results,” says Travison, “that was convincing to me that we were seeing a true biological change over time, as opposed to just some measurement error.”
Mitch Harman M.D., Ph.D., an endocrinologist at the University of Arizona college of medicine and the director of the Kronos Longevity Research Institute, sees the shadow of Silent Spring. Back in 1962, when Rachel Carson published her environmental classic, estrogen-like substances in the insecticide DDT were making eggshells so thin that they were crushed by nesting parents; populations of eagles and other large birds plummeted. And today? Dr. Harman says, “I’m concerned that we’re just pouring chemicals out into our environment that are endocrine-suppressing, estrogen-like compounds,” possibly causing similar disruptions in human reproduction. The authors of a recent article in the Medical Journal of Australia likewise suggest that from early fetal life onward, male hormonal and reproductive functions are under “xenobiotic attack,” meaning chemicals not naturally found in the body appear to be disrupting normal biological development.
For instance, 90 percent of American men have evidence of chlorpyrifos in their urine. This shouldn’t be surprising, since up to 19 million pounds of the stuff was distributed across the United States in 1999 alone, much of it in household products like tick-and-flea powder for pets, lawn treatments, and common insecticides. Though residential use is now restricted, chlorpyrifos is still common in agriculture, as well as in some professional applications; for most people, diet is now the main source of exposure. In a recent Harvard study, men with the highest chlorpyrifos exposure typically had 20 percent less testosterone than those with the lowest exposure.
Carbaryl is another possible culprit. Detectable levels turn up in 75 percent of American men, and having it in your urine appears to be associated with reduced sperm count and liveliness, or motility, as well as increased DNA damage. And yet we still apply carbaryl to lawns and gardens at a rate of up to 4 million pounds a year, mostly by way of an insecticide known as Sevin. There should be a bumper sticker: Honey, the lawn shrunk my testicles.
Originally posted by sheepslayer247
Perhaps a little less testosterone is a good thing. As an athlete for many years, I have seen too many young men get so pumped on their own testosterone that they become the dumbest meatheads you could possibly imagine.
Higher levels of testosterone seems to impede the natural brain process of "thinking" and all too often we here stories of young men doing dumb and destructive things.
So I am not worried about it. Nature will continue to run it's course and there is nothing we can do about it.edit on 17-10-2012 by sheepslayer247 because: (no reason given)
Originally posted by kosmicjack
Linked to obesity and hormone disruption.