But science has just taken a major step towards explaining why – and it's not about how many six-packs you knock back.

Wondering why staying slim feels harder after your teens? Science explains how your metabolism, hormones, muscle mass, and ...

What if you could eat whatever you want and never worry about your waistline? It may not be as far-fetched as it sounds. Researchers at the University of Colorado Boulder may have found the mechanisms ...

Learn why a pound of muscle weighs the same as a pound of fat, why muscle looks different, and why the scale doesn’t tell the ...

Add Yahoo as a preferred source to see more of our stories on Google. And as it turns out, some of the sneakiest reasons for sudden weight gain are related to your hormones. Here, the top culprits and ...

Losing weight can be tricky. Gaining muscle isn't exactly a walk in the park, either. So, losing weight and gaining muscle at the same time? Impossible, right? Not necessarily. Losing weight can be ...

With the holidays behind us, many Americans are seeing the numbers on the scale go up a pound or two. In fact, data shows that many American midlife and older adults gain 1 to 1.5 pounds over the ...

Muscle loss with ageing, known as sarcopenia, is a natural process that begins around the age of 30 and accelerates after 50 ...

Find out what causes menopausal weight gain and learn ways to help minimize it.