January 13, 2012 |
Remember this name: irisin. A newly described polypeptide hormone named after the Greek messenger goddess Iris, irisin may one day play a role in defeating the twin epidemics of obesity and Type 2 diabetes. It made its debut on Thursday in the journal Nature . To understand how irisin might help the lumbering masses lose mass, it helps to remember that mammalian fat comes in (at least) two colors. Brown is the new black: It's what you want more of. Unlike the white fat that lards the thighs and jiggles dangerously across the belly, brown fat's the stuff that boosts a mammal's energy expenditure.
December 1, 2011 |
Reporting from New York - The head of the World Anti-Doping Agency chided the NFL Players Assn. on Thursday for not giving a green light to testing players for human growth hormone. "It seems [the union's objection] is not based on science," WADA chief David Howman said. "You're better [off] to expose yourself to a test than decline it, because the impression you leave is that you have something to hide. " The new NFL labor contract allowed HGH testing as early as this season but only if the players' union approved the tests.
November 22, 2011 |
Live long enough, you'll see everything. One of America's major sports just announced a new collective bargaining agreement. It is the same one that is expanding its drug testing program to become the first to include blood testing for human growth hormone. And that sport is baseball. Where have you gone, Pete Rozelle? You too, the young David Stern? Baseball lost the 1994 World Series to civil strife between small-market clubs and large-market clubs and a 25-year war with the players union.
November 14, 2011 |
Around the time of menopause, many women complain of mental slippage. But, as if to inflict some perverse trick upon them, cognitive scientists have found that they actually perform no more poorly than women who do not have such complaints. (Reassuring in a way: You're not losing your memory, but you may be losing your mind.) A new study finds that both the women who complain of memory problems and the cognitive scientists are right. These women haven't fallen behind -- not yet at least-- because their brains are working harder to keep up. The study, presented Sunday at the Society for Neuroscience's yearly confab -- held this year in Washington, D.C. -- recruited 22 healthy women with an average age of 57, all post-menopausal.
November 4, 2011 |
A significant rise in hip fractures among women is one result of the decade-long slide in the popularity of hormone replacement therapy, researchers report in a new study. The landmark Women's Health Initiative study showed unequivocally that hormone therapy helps strengthen women's bones and prevents fractures of hip, wrist and spine by 27% to 35%. However, hormone use fell out of favor after studies in 2002 showed it raised the risk of breast cancer and did not lower heart-disease risk and, in fact, may elevate the risk in some women.
October 27, 2011 |
As if Americans needed any reminder that weight loss is hard and maintaining weight loss even harder, a study has found that for at least a year, subjects who shed weight on a low-calorie diet were hungrier than when they started and had higher levels of hormones that tell the body to eat more, conserve energy and store away fuel as fat. The report, published Wednesday in the New England Journal of Medicine, helps explain why roughly 4 in 5...
October 4, 2011 |
Brown fat has been a hot topic in obesity research in recent years. So has a hormone produced in the brain called orexin. Now scientists have linked these two concepts in a theory that may lead to new weight-loss therapies. Brown fat is a healthy substance that contains blood vessels and helps burn fat. People who are obese are thought to have less-active brown fat. Orexin is a hormone that is known to play a role in controlling appetite. In a paper published Tuesday, scientists have shown that orexin also activates brown fat to burn calories.
October 3, 2011 |
A new test that can detect the use of human growth hormone for up to 21 days has been endorsed by international anti-doping officials, moving a step closer to a potential breakthrough against doping at next year's London Olympics. U.S. Anti-Doping Agency Chief Executive Travis Tygart told the Associated Press on Monday that the "biomarker" test for HGH won strong consensus among doping scientists and experts from around the world who attended a London symposium on detecting growth factors.
October 3, 2011 |
Use of hormonal contraceptives may double the risk of catching or transmitting HIV-1 (the most common and dangerous strain of HIV), according to a new study of thousands of heterosexual couples in sub-Saharan Africa. In each case, just one of the couple -- the woman or the man -- was HIV-positive. Some took hormonal contraceptives and some didn't. The 3,790 couples in seven countries were tracked for about 18 months, and the rates at which the other member of the couple became HIV-positive were carefully noted.
September 15, 2011 |
Healthy women who go through menopause naturally may lower their risk of heart disease if they take hormone therapy in the early years of menopause, according to a new study. The research is the latest contribution to the longstanding controversy on the merits of hormone therapy after menopause. Previous studies show that hormone therapy in women who are 10 or more years past menopause raises the risk of cardiovascular problems. However, the question of whether hormone therapy may prevent or slow the development of heart disease in younger menopausal women has been a subject of continued debate.