There may be many reasons like psychological factors some anxiety or stress or low food intake in between main meals or low fibre diet or any physiological factor. Eat salad or light healthy snacks as pre lunch or dinner. Take whole less processed food in your diet Start your main meals with salad only to satisfy your hunger. Drink 1 glass water 15 mnts before meals

Take more water to supress overeating or take cucumber and carrot slices when you feel like eating more.

Things like these usually happen because of an erratic dietary regime and indulging oneself in unnecessary snacking. You must:- a) Set your metabolism levels right by following a strict dietary regime and setting your body clock right, having meals at the same time everyday b) Have 6-8 small frequent meals instead of 3 big meals and do not skip meals