Egg yolks are a major source of cholesterol, with a single large egg containing more than half of the recommended daily amount of cholesterol. The cholesterol in egg yolks comes from lecithin, a phospholipid that is essential for proper cell structure and function. Egg yolks also contain essential fatty acids, vitamins, and minerals necessary for a healthy diet. However, because of the high cholesterol content, it is recommended to limit egg yolk consumption to a few times a week. Additionally, eating the whole egg is better than eating just the yolk, as the egg white contains important proteins and other nutrients.