22/10/2013
http://medidilug.com/
For many relatively fit men, developing a paunch around the middle appears to be a practically inevitable part of aging. Even if you've avoided any major weight gain until your 40s, that belly starts to expand. You cut back on calories, do some extra crunches at the gym, but still you notice a little bit of padding that wasn't there before. Yes, this does have to do with getting older, but the more specific reason scientists have found for it might surprise you. The answer appears to lie with estrogen, the hormone typically associated mainly with women.
According to the research, which took place at the Harvard Medical School in Boston, Massachusetts, dips in estrogen may have a major influence on the weight men often put on in middle age, very similar to the effect they are known to have on women's bodies. The changes that take place to many men's bodies--which often include some loss of muscle and a dampening of the libido as well as the development of a spare tire--have long been linked to the declining levels of testosterone. But the new study reveals that it is not just due to a lack of testosterone, but lower levels of estrogen too.
The subjects were 400 men between the ages of 20 and 50 who were willing to allow the scientists to halt their body's natural production of testosterone with injections for a 16-week period. They were randomly divided into two groups. The first group was given varying amounts of testosterone. The second group was provided with testosterone as well as a pharmaceutical medication that stopped all estrogen synthesis. This allowed the researchers to compare the volunteers with testosterone and estrogen with those who only had testosterone present. Those men who were "made" unable to produce any estrogen had more negative effects than their peers whose estrogen levels had not been tampered with, and these effects included the accumulation of fat and severe hot flashes.
This men's health issue actually parallels what happens to women as they age. Women have an abundance of estrogen but very low levels of testosterone. In other words, when it comes to testosterone, the margin of error for women is very small. Just a small drop in testosterone levels for women can make a huge difference physically and in quality of life. For men, the problem is that under normal circumstances, they maintain a very low, but very necessary level of estrogen in their bodies. When that level of estrogen drops even a little, the effects on men are equally profound both physically and in terms of quality of life as a small testosterone drop is for women