Do you mean to say that it is all right to eat twice but within a given period? I have read in one discussion about the window hours of 4 hours which means that I can eat so much and regardless of the frequency as long as it is within that window period. Am I right on my assumption?
Studies of dieters given the same amount of food , with one group eating it all in one meal, and the other group eating the same amount of calories of food, but eating it in several meals, discovered that the group that ate everything in one meal lost more weight, and felt better than the people that had their food divided into several meals.
The reason is because if you are only eating one meal, and fasting for 20+ hours, then your insulin level will drop, and when insulin goes down, then HGH (human growth hormone) goes up, and you will burn fat and lose weight more efficiently.
Some people do an IF plan called 16-8, which is where you would fast for 16 hours per day, and have an 8 hour eating window. Of course, you do not eat constantly during that time, but you could have a main meal and a small healthy snack meal during that time. This is sometimes a good way to work into eating only one meal a day, and this is how I did it; I just kind of “sneaked my way” into OMAD from IF.