The trans fat fight got a little hotter on Monday when the American Heart Association became the first big health group to push a specific limit on trans fats in the diet.

The organization urged that trans fat should be less than 1 percent of a person's total calories, according to its new guidelines. The group also recommended lifestyle changes, including an emphasis on getting exercise and not smoking.

Other recommendations include eating fruits and vegetables that are deep in color, such as spinach, carrots, peaches and berries and choosing whole-grain, high-fiber foods.

Just last week, a consumer group sued KFC to try the chain to stop frying its chicken in trans fats. Wendy's also announced that it was switching to a healthier oil.

To get the complete guidelines, visit http://www.americanheart.org.