Egg nutritional benefit: In essence, there are two parts of an egg which are distinctly different from each other: the yolk and the white. In order to understand egg nutrition facts properly, let's understand the nutritional difference between the both parts. The yolk is a storehouse of cholesterol, saturated fat, vitamins and minerals. One egg yolk contains 55 calories, 4.5 grams of total fat, 1.6, grams of saturated fat, 184 milligrams of cholesterol, and small amounts of vitamin A, vitamin D, vitamin B6, Iron and vitamin B12. The egg white is mainly a storehouse of protein. One egg white contains 17 calories, 0 grams of total fat, 0 grams of saturated fat, 0 milligrams of cholesterol, 0 grams of carbohydrate, and about 4 grams of protein. In addition, the egg white contains no appreciable vitamins or minerals.