how many times, when and how much should we eat - eating food rules

 Manusmriti Verse 4.62 explains this.

https://www.wisdomlib.org/hinduism/book/manusmriti-with-the-commentary-of-medhatithi/d/doc200166.html

one can eat up to 75% of his capacity including fluids. so that there will be enough room to mix food with gases very easily

one can eat two times a day max if not eaten full at once. if he fills his stomach once he should not eat second time.

best time to eat for weaker person is minimum 3 hours after sunrise. for stronger people he should eat at mid day. But there is also one thing that we should not eat at twilight time at mid day

Brahmapurāṇa (Do., p. 476).—‘One should not eat while there is indigestion,... nor during the twilights, or at midday or at midnight.’

https://www.wisdomlib.org/hinduism/book/manusmriti-with-the-commentary-of-medhatithi/d/doc200166.html

sunset sunrise mid day or abhijith abijith muhoortha