We can obtain a lot of protein from whole-foods, one such easily available source is the egg protein. Whole eggs have a very high protein content. Egg white protein is a pure protein source while whole eggs contain protein as well as fats. A medium sized whole egg has about 6 grams of protein and 78 calories. Another very popular source of protein is lean and red meat, one roasted chicken breast has only 284 calories and contains about 53 grams of protein. Lean beef or any other red meat source is known to contain mostly protein and some fats.