What is the origin of vegetarianism on the fifteenth day of the first lunar month?

Vegetarianism on the fifteenth day of junior high school conforms to scientific laws.

According to the tidal theory, the influence of the moon on the earth is mainly the water exerted on the earth, which is often clearly reflected by the periodic fluctuation of ocean tides. The water in human body accounts for more than 80% of the body, and the salt concentration in human blood is almost the same as that in the ocean. Therefore, whenever the change of ocean tides reaches the maximum on the first and fifteenth day of the lunar calendar, the surging blood "tide" in our body also reaches the maximum. At this time, human blood gas is either the most abundant or the most declining. In short, emotions will fall into an extreme state.

From this point of view, we can understand why those prophets and saints say that vegetarian fasting will have greater merits at this time. The temple chose this day to recite the scriptures because people's physical and mental health is most vulnerable to the influence of the moon tide at this time.