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.
January 3, 2012 |
Eating excess calories will add extra pounds, but eat too little protein and you could be putting more fat on your body, a study suggests. The study, released Tuesday in the Journal of the American Medical Assn. , looked at how three diets with different protein contents influenced weight gain and body composition. Those findings may have larger implications for combating obesity. Researchers, led by Dr. George Bray of the Pennington Biomedical Research Center in Louisiana, put 25 people age 18 to 35 on a weight maintenance diet for 13 to 25 days.
March 3, 2011 |
Move over, BMI. Researchers led by a University of Southern California physician have proposed "a better index of adiposity. " This one would require a tape measure and a calculator, but none of the stepping-up-on-the-scale drama featured on NBC's The Biggest Loser and replayed so often in the privacy of our own bathrooms. The new fat metric is called the Body Adiposity Index, and it's introduced in a study released Thursday in the journal Obesity . It uses a person's height and hip circumference to give a accurate reading of how much of a person's body is made up of fat. That's a measure that physical trainers and some physicians can get by ordering a dual-energy X-ray absorption test (also used to detect osteoporosis)
May 26, 2008 |
What is the secret to looking ripped? I lift weights, run and do yoga, but can't seem to get my body as ripped and lean as I would like. Any suggestions? Adam Santa Monica -- Most everyone has the ability to increase strength and muscle tone to some degree, but few have the genes to develop large muscles and the super-cut look often seen on models and actors. To achieve the physique you want, you need significant levels of muscle mass -- attainable through strength-training.
May 26, 2008 |
Depending on which Japanese conglomerate you believe, either I have the body of a 25-year-old or I'm pushing 70. Which is disconcerting either way, because I was a mess when I was 25, and I'd prefer to let 70 wait its turn. But according to the statisticians at such companies as Omron and Tanita, my "metabolic age" lies at one of those extremes. What's "metabolic age"?
May 10, 2008 |
Subcutaneous fat that accumulates around the hips and buttocks may offer some protection against diabetes, U.S. researchers reported Tuesday in the journal Cell Metabolism. They said the fat, which collects immediately under the skin, helped to improve sensitivity to the hormone insulin, which regulates blood sugar. In contrast, visceral fat, which accumulates in the abdomen, is known to exacerbate the effects of diabetes.