Want a big fat belly? Eat lots of fast food fried in trans fats. The primary source of trans fat in Americans' diet is fast food.
Trans fats make you fatter than other foods with the same number of calories -- but that's not all. Researchers at Wake Forest University find that trans fats increase the amount of fat around the belly. They do this not just by adding new fat, but also by moving fat from other areas to the belly.
"Trans fat is worse than anticipated," Wake Forest researcher Lawrence L. Rudel, PhD, says in a news release. "Diets rich in trans fat cause a redistribution of fat tissue into the abdomen and lead to a higher body weight even when the total dietary calories are controlled."