FWIW, eating once a day is recommended in the "Hacker Diet" book, written by the author of Autocad. The book says multiple (smaller) meals are fine too, but you have to read it yourself, I won't do it justice here.
Also, you need to try it yourself. Every body is different.
You should try things like multiple small meals, or one big meal, or no carbs, or no gluten and honestly evaluate how they impact your life.