It is relatively appropriate to eat only one egg yolk per day for the following reasons: 1. If too much egg yolk is eaten, it will cause an excessive intake of cholesterol, because the amount of cholesterol contained in each egg yolk is between 250-300 mg, which will cause an increased risk of chronic metabolic diseases such as atherosclerosis and hyperlipidemia if too much is consumed. 2. Egg yolk is also rich in fat-soluble Vitamins A and D. If too much egg yolk is eaten, it can cause excessive accumulation of fat-soluble vitamins in the body, which may cause metabolic disorders of liver function, which can manifest as yellowing of the skin mucosa and endanger health.