Egg yolk is the yellow part inside the egg, and the main minerals, vitamins and phospholipids in the egg are all in the egg yolk. The main components of egg yolk are 17, 5% protein, 32,5% fat, about 48% water, 2% minerals and multivitamins.

1. Most of the fat in eggs is concentrated in the yolk. Monounsaturated fatty acids are the main fat in egg yolk, and more than half of them are oleic acid, the main component of olive oil.

2. Vitamins are mostly concentrated in egg yolk. Egg yolk contains valuable vitamins A and D, as well as vitamins E and K, which belong to "fat-soluble vitamins";

3. Various trace elements are also concentrated in egg yolk. Egg yolk contains a lot of phosphorus and iron.

4. Egg yolk is a good source of lutein and zeaxanthin. Studies have shown that more than one third of the fat-soluble yellow substances in egg yolk come from these two components and are easily absorbed by the human body.