Compared with ordinary fresh eggs, braised eggs are more delicious and more elastic in taste, but some nutrients are lost due to long cooking time. Tannic acid is produced in the process of making marinated eggs. Tannic acid is similar to protein in food. Once they meet, solidified substances will be deposited in the body, which will seriously affect the human body's absorption and utilization of protein, and a lot of vitamins will be lost, and the nutritional value of eggs will also be wasted. Marinated eggs are preserved foods. The longer they are preserved, the better their taste will be, and the more nutrients will be lost. Because marinated eggs are preserved for a long time, they contain nitrite substances. If they are eaten frequently, they will be wasted. Eating too much boiled eggs in tea leaves is very irritating to the stomach. Over time, it will affect the digestion and absorption of nutrients and is not conducive to health.