My nutritionist recommended to eat the three meals at the same hour. She even told me to separate them evenly thru the day, e.g., breakfast at 10, lunch at 2 (4 hours later) and dinner at 6 (again 4 hours later).

This is pretty similar to sleep advice, go to bed and wake up at the same time, every day.

I read somewhere that when you do things at the same hour every day your body prepare for the activity. I can't find the link, but might be curious to know if there's any study to back it up.