This has something to do with everyone's different metabolism and endocrine system. In fact, although the whole grains we usually eat are healthy foods, they all contain too many harmful substances. After entering our body, our liver needs detoxification and digestion. Because everyone's liver has different detoxification ability, food that fails to detoxify enters our blood circulation system, which can easily cause adverse reactions or lead to diseases in a certain part. Therefore, not eating junk food is a condition of health preservation.