Breakfast at 7-8 a.m., lunch at 1-4 p.m. and dinner at 7-20 p.m. This eating pattern has been familiar to us since childhood, but it is not a biological necessity, as one might think when looking at its widespread use. People did not always eat three meals a day. This regimen was formed under the influence of culture, more specifically, the eight-hour workday. Let's see if three meals a day has any advantages beyond convenience.