When maintaining, either eat the same amount of calories every day (for most men, this comes out to around 14 to 16 calories per pound of body weight per day) or eat more on the days that you’re more active and less on the days that you’re less active. When maintaining, 30 percent of your calories should come from protein, 45 percent should come from carbohydrate, and 25 percent should come from dietary fat. For most people, this comes out to around 1 gram of protein, 1.6 grams of carbohydrate, and 0.4 grams of dietary fat per pound of body weight per day.