It takes a lot more effort for your body to digest protein than fats or carbs—some evidence suggest that as much as 30% more. This means you can eat 100 calories of protein and your body will only have access to 70. Protein is also essential for building lean muscle which is metabolically active and makes your weight-loss goals more manageable. Use this to your advantage by including lean protein EVERY time you eat. That means eggs for breakfast, turkey for lunch, a post workout protein shake and beef for dinner.