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A new study finds that a drop in testosterone levels over time is more likely to result from a man’s behavioral and health changes than by aging. The study results will be presented Monday at The Endocrine Society’s 94th Annual Meeting in Houston.
“Declining testosterone levels are not an inevitable part of the aging process, as many people think,” said study co-author Gary Wittert, MD, professor of medicine at the University of Adelaide in Adelaide, Australia. “Testosterone changes are largely explained by smoking behavior and changes in health status, particularly obesity and depression.”
Many older men have low levels of the sex hormone testosterone, but the cause is not known. Few population-based studies have tracked changes in testosterone levels among the same men over time, as their study did, Wittert said.
In this study, supported by the National Health and Medical Research Council of Australia, the authors analyzed testosterone measurements in more than 1,500 men who had measurements taken at two clinic visits five years apart. All blood testosterone samples underwent testing at the same time for each time point, according to Wittert.
After the researchers excluded from the analysis any men who had abnormal lab values or who were taking medications or had medical conditions known to affect hormones, they included 1,382 men in the data analysis. Men ranged in age from 35 to 80 years, with an average age of 54.
On average, testosterone levels did not decline significantly over five years; rather, they decreased less than 1 percent each year, the authors reported. However, when the investigators analyzed the data by subgroups, they found that certain factors were linked to lower testosterone levels at five years than at the beginning of the study.
“Men who had declines in testosterone were more likely to be those who became obese, had stopped smoking or were depressed at either clinic visit,” Wittert said. “While stopping smoking may be a cause of a slight decrease in testosterone, the benefit of quitting smoking is huge.”
Past research has linked depression and low testosterone. This hormone is important for many bodily functions, including maintaining a healthy body composition, fertility and sex drive. “It is critical that doctors understand that declining testosterone levels are not a natural part of aging and that they are most likely due to health-related behaviors or health status itself,” he said.
Unmarried men in the study had greater testosterone reductions than did married men. Wittert attributed this finding to past research showing that married men tend to be healthier and happier than unmarried men. “Also, regular sexual activity tends to increase testosterone,” he explained.
The study findings were presented by Andre Araujo, PhD, who was a visiting professor at the University of Adelaide and is vice president of epidemiology at New England Research Institutes, Watertown, Mass.
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Founded in 1916, The Endocrine Society is the world’s oldest, largest and most active organization devoted to research on hormones and the clinical practice of endocrinology. Today, The Endocrine Society’s membership consists of over 15,000 scientists, physicians, educators, nurses and students in more than 100 countries. Society members represent all basic, applied and clinical interests in endocrinology. The Endocrine Society is based in Chevy Chase, Maryland. To learn more about the Society and the field of endocrinology, visit our site at The Endocrine Society – Devoted to Hormone Research and the Clinical Practice of Endocrinology. Follow us on Twitter at https://twitter.com/#!/EndoMedia.
What about these so called chemicals in plastics tht are said to even change either rna or dna to the point that it looks as if evolution is happening right before our eyes?
Don't know, but this subject bothers the head.
Good read bro thanks!
Or there keeping there mouth shut and playing dumb.
It's well known that EXenoestrogens (meaning foreign estrogens) environmental compounds (usually Petrochemical) that are extremely toxic, Chemical solvents of many kinds Xenoes with the same A-ring as Estrogen are found in Pesticides, industrial by products, *dioxins* and Plastics as well as many other chems, even ones used to make everyday cosmetics are extremely toxic in the body and lower test levels. (a-lot of these are even potent at nano-grams which is a billionth of a gram.
Besides being cancer causing Carcinogens they lower hormone levels.
Good reason not to use plastics in the microwave!
We all know or should know Estrogen is the main regulator of the HPTA in men, and these EXenoestrogens have the same effect on the HPTA and lower Test levels!
You single guys might stay up on your clomid/nolva and practice the 5 finger discount for better test levels no? lol
Last edited by SHINE; 07-23-2012 at 09:41 PM.
There was another good article on the long term affects of BPA's let me see if I can remember wher I read it.
This study does not provide much information relating to causation, rather it merely appears to identify correlation. Consequently, does obesity cause a decline in testosterone levels, or do a decline in testosterone cause increased weight gain? That's a pretty easy one to me. Many of us could eat like a horse when we were 18 and our test levels were through the roof, and we can't eat like that any more when we're in our forties.
I guess I wouldn't be surprised about smoking affecting test levels, but it would be nice to see something more than merely correlation, for example a controlled study that minimizes other factors.
The decline in test could be from all the BPA we drink/eat which comes from all the plastic bottles/containers.
I'm currently trying a new approach to the estrogen and dht reduction and block. It may work, it may not.
So the pit gland keeps it level, right, then in a male some test is converted to est?