flexuline muscle builder all proteins are made up of amino acids. Certain amino acids can be made by the body, while others cannot. Your body doesn't need the amino acids it can make on its own. However, the amino acids that the body can't make must be taken in through your diet. The body must have all the essential amino acids in order to repair or build tissue.Many people make the mistake of cutting out carbs when they try to gain muscle, but you need those carbs to fuel the body when you're exercising. Carbs are the main source of energy for your body, and if you severely reduce your carbs, you'll also reduce your energy levels, making muscle building more difficult. Carbs are stored as glycogen in the body, and it's important to keep the glycogen levels high enough that the body never starts to use protein for energy.It's important to eat enough carbs each day to make sure your body has plenty of calories to use for energy. This ensures that the protein you eat is left to support the growth and repair of muscles.