When asked registered dietitian Leslie Langevin, MS, RD, CD Whole Health Nutrition to answer that question, he said: It is better to eat when hungry. This is the concept of mindful eating. Every time you put something in your mouth, ask yourself if you're hungry.
It also adds that it is important to know what is hunger, because hunger is important for weight loss. Some people are stomach growling, some are increased salivation and thought of food. You want to eat when you're around a three on the scale of hunger, a hunger growling belly. And the most important thing here is to eat enough until at about six on the scale of hunger, where you feel satisfied but not stuffed or tired of eating too much.
Eat when hungry and eat only enough to feel satiated is the key. That could mean eating three times a day, and that could mean eating six times a day.
Leslie does that say, I think if you are a person who is a patron of food or someone who does not really seem to hunger. Some people forget to eat because they were busy, or your work schedule are only allowed to take breaks at certain times, so it is important for these cases, schedule snacks and meals. But overall, if you're schedule permits go for the approach of eating hunger / conscious.