Old people eat 1 egg every day, and cholesterol only increases by 0.0 1% mg, which will not cause arteriosclerosis. In addition, there is a substance in eggs that can be absorbed by the brain and converted into acetylcholine. Acetylcholine is a chemical substance that transmits information in the nervous system. The greater their content in the brain, the faster the information is transmitted. Therefore, it is of great benefit for the elderly to eat one or two eggs a day.