Protein Rich Diet On Keto What Is Protein? Protein is made up of several small units known as amino acids. The three types of proteins are fibrous, globular and membrane. What Does Protein Do? The amino acids in Protein repairs muscles and helps in tissue growth. This helps in maintaining good skin, nails and hair health. Protein in our body helps in maintaining and functioning of hormones. Where Does Protein Come From? Proteins should come from fatty sources, for most of the time (80%), such as eggs, bacon, pork, steak, ground beef and lamb. The remaining 20% should be coming from cheese, chicken, nuts and fish. Poultry: Free-range Cornish hen, quail, goose, pheasant, chicken, duck, and turkey. Fish and Seafood: Cod, tuna, scrod, anchovies, mackerel, flounder, catfish, trout, mahi-mahi, halibut, sole, sardines, salmon...