rules of weight lose.

& Vitamin D
Strive for three servings of calcium- and vitamin D-rich foods a day. These nutrients often occur together in foods, especially dairy.

Calcium and vitamin D work together in your body, primarily to strengthen your bones. But if the latest research is any indication, both of these nutrients may flex some muscle in your weight loss success. Dairy foods are the prime source of calcium and vitamin D in the diet. In a study from Johns Hopkins Bloomberg School of Public Health, college students who came closest to meeting the three-a-day dairy requirement while eating an otherwise healthy diet weighed less, gained less, and actually lost belly fat, compared with students who consumed little or no dairy.

Moreover, vitamin D by itself may play a role in weight control. Extra body fat holds on to vitamin D so that the body can’t use it. This perceived deficiency interferes with the action of the hormone leptin, whose job is to tell your brain that you’re full. And if you can’t recognize when you’re satiated, you’re more likely to overeat.

A study published in the journal Appetite shows how these fats—besides being good for your heart—can help you feel fuller longer after meals. The study participants with a higher intake of omega-3 fatty acids (more than 1,300 milligrams a day, either from foods or from supplements) reported feeling less hungry right after their meals, as well as 2 hours later, compared with a lower omega-3 intake (less than 260 milligrams a day). Less hunger means less munching and an easier time keeping calories in check.

Sip at least 3 cups of green tea every day. Catechins, the antioxidants found in high amounts in green tea, have been shown to be helpful in promoting weight loss, specifically belly fat. If caffeine is a concern, decaf tea is an option. Some decaffeination processes, however, can lower the antioxidant content so you might want to have an extra cup or two.

In a study at the USDA Human Nutrition Research Center on Aging at Tufts University, participants who drank the equivalent of 3 cups of green tea a day lost twice as much weight as those not drinking tea. The tea-drinking group also lost significantly more belly fat than the non-tea drinkers.

Men and women who consumed a postexercise protein drink gained more metabolism-revving muscle mass and lost 50% more body fat than those who didn't refuel after working out, found a study published in Fitness Management. "For about 30 minutes after exercise, muscles are especially receptive to amino acids," says Wayne Westcott, PhD, the lead study author. "The combo we used—about 24 g of protein and 36 g of carbs—helps speed muscle repair and growth. As long as you eat close to 20 g of protein and 30 g of carbs, you'll get similar results." Enjoy this snack—or something similar—soon after exercise.