It would be great if there were one magic formula everyone could follow and know what, when, and how much to eat to look and feel their best, so no one has to guess and face possible side effects such as weight gain. But there isn’t. Making a snack healthy means making it balanced, Lisa Moskovitz, RD, CDN at New York Nutrition Group, says. You should ideally include protein, carbs and healthy fats. A 100-calorie snack should contain at least of these macronutrients, she adds.