1. Because the metabolism of the human body accelerates from 4 am and reaches its peak at 16 in the afternoon; Therefore, the human body must supplement nutrition. This is why we have to have breakfast and lunch. However, from the afternoon of 16 to 4 am, the metabolism of the human body gradually declined; So you can't replenish your metabolism at night. Otherwise, the body will turn them into waste fat,

2. Because the biological clock of the human body requires the human body to move during the day and sleep at night; In other words, all organs of the body should exercise during the day and rest at night; Furthermore, the gastrointestinal tract should rest rather than work; Therefore, eating dinner is against the laws of nature.

I hope my answer can help you. Thank you.