The ancients ate several meals a day, largely not for health, but because of material conditions and social behavior. In an era of insufficient materials, the ancients often adopted the system of "two meals a day". Until the pre-Qin period, the homes of ordinary people were "two-meal system". Of these two meals, the first one is called "eating" and the second one is called "feeding". The dietary custom of "three meals a day" began after Wei and Jin Dynasties, and it really became popular in Sui and Tang Dynasties. At this time, people basically eat three meals a day, which is no different from the "three-meal system" in modern concepts.