The benefits of eating egg yolk: 1. It provides the body with rich vitamin A, which is an important raw material for the photoreceptors of the retina. Therefore, eating egg yolks can improve the level of vision, especially the level of dark vision, the benefits will be very obvious. 2, can provide the body with rich vitamin D, and vitamin D can promote the intestinal mucosa on the absorption of calcium, can also promote the renal tubules on the absorption of calcium, so the benefits in improving calcium absorption, metabolism, utilization will be very obvious. The downside of eating egg yolk is that it can easily cause excessive cholesterol intake, which in turn may lead to a high risk of chronic diseases such as atherosclerosis and coronary heart disease.