50 foods under 100 calories. Eating 5-6 times a day (3 meals with a snack in between each meal) keeps your metabolism going! If you're trying to lose weight 100 calories is a good snack. If you're working out you may need more than a 100 calorie snack. The best snack is natural/not processed (fruit/nuts/veggie/yogurt) and has protein with the carbs to keep you full!