I find that my need to eat frequently is very well correlated with the percentage of calories that I receive from carbohydrates. I used to eat 4-5 times a day to avoid that low blood sugar feeling (light headed and weak). I have switched to a ketogenic diet and get most of my calories from fat. This has had an enormous impact on when I have to eat. I can now, if I have to, skip a meal and not feel like I might pass out.