PROTEINS (1 GRAM YIELDS 4 CALORIES) ARE USED TO BUILD AND REPAIR TISSUES AND STRUCTURES IN YOUR BODY. THEY ARE ALSO NEEDED TO SYNTHESIZE HORMONES, ENZYMES AND PEPTIDES, AND CAN ALSO BE USED FOR ENERGY IN DIETS LACKING CALORIES OR CARBS. EXCESSIVE AMOUNTS OF PROTEIN (AS IS IN MANY DIETS TODAY) ARE STORED AS BODY FAT FOR POTENTIAL ENERGY. CHOOSE LEAN OR LOW-FAT MEATS OVER REGULAR GROUND BEEF. GOOD SOURCES OF PROTEIN: MEATS (ANY THAT ARE LOW IN FAT), POULTRY (CHICKEN, TURKEY), FISH (TUNA, SALMON), EGGS (REAL OR EGG BEATERS), WHEY PROTEIN (ON WHEY SHAKE, LARA BAR, CLIFF BAR).