You know that protein can keep you full longer and burn more calories during digestion. Choose your protein carefully. Dark meat tends to be high in fat, which could cancel out some of the benefits. Skinless chicken breast is a great choice. And some cuts of beef can make the grade. Flank steak, eye of round, and top sirloin are extra-lean with less than 4 grams of saturated fat per serving. Stick with a 3- to 4-ounce portion.
Carb crazy? Consider this: Refined carbohydrates, such as bread, potatoes and rice, create a surge in insulin that in turn drives down your resting metabolic rate, explains Aronne. "It's important to keep carbohydrates in your diet, but really focus on fruits, vegetables and whole grains, which have less of an effect on insulin levels," he explains. And when buying whole-grain breads and cereals, make sure the first ingredient listed is whole wheat, whole oat or cracked wheat.
This may explain why the fat-burning effects of eating more protein were confirmed in a study published in the American Journal of Physiology. One group was fed a high-protein diet (just over 1 gram per pound of body weight per day) while the second group consumed an amount closer to the lower recommendation of the RDA (recommended dietary allowance). The group eating the higher-protein diet burned the most fat.