Different Types Of Proteins Proteins are needed by our body for muscle building and repairing worn-out tissues. Our muscles, organs, and even blood are made up of mostly proteins. If we do not eat proteins, our body will not be able to repair damaged cells, or build new ones. Proteins in our diet come from both animal and plant sources. Meat, fish, egg, and milk are some … [Read more...] about How Many Different Types Of Proteins Are There