Why do we need carbohydrates? Because these carbohydrates actually protect the proteins in our body. If there are not enough carbohydrates in the diet, the body will seek to other sources for energy, usually fats and proteins. Carbohydrates are our body more efficient source of energy. While we can use fats for energy, they are terribly less efficient, which is why having a low-carbs diet with no exercise is an extremely slow method to lose weight. Then there’re the proteins. We don’t want the proteins to be our use in our energy. The main role of proteins is to supply amino acid which leads to muscle development, which is why bodybuilders are encouraged to consume more meats that are rich in protein. If the proteins are instead redirected to replace the usual role of the glucose, they aren’t able to provide as much for the muscles and hinder the growth. It’s all about the balance, where all the nutrients support each other and having their own roles to fulfill, with carbohydrates being the main source of our energy.