Fact : Proteins are macronutrients that constitute around approximately 17% of our body composition. Since a large portion of our body comprises protein, the nutrient can easily provide the energy it produces to these areas. Overall, protein provides the human body with 12-15% of the total energy it requires. Typically, if a person consumes approximately 1 gram of protein, they would gain around 4 calories. Therefore, in terms of energy gain, protein is actually necessary.