Eggs are one of nature's most perfectly balanced foods, containing all the protein, vitamins (except vitamin C) and minerals essential for good health.Eggs have a high nutrient density because they provide significant amounts of vitamins and minerals yet contain only 71 calories. They are an excellent source of high quality protein (i.e. they contain all the essential amino acids) as well as many B vitamins. The nutritional value of an egg is divided between the egg white and the egg yolk.