Carbohydrates are great food for energy but the problem is that the body converts them to sugar and then expects you to burn them. If you’re running a marathon, that’s ideal. If you’re just going back to your desk, you are going to get a bunch of calories turning to fat and a crash. Carbs make you want more carbs, which makes you fat. But eventually carbs make you feel fatigued, tired, worn out. This generally does not help your youthful appearance. The ideal snacks are veggies or some protein.