But if you're sensitive to gluten — about 1 in every 133 Americans — cutting it out of your diet is a necessity. Like with any other major change you make to what you're putting in your body, there could be side effects. A lot of the whole-grain foods you cut out on a gluten-free diet (like bread and pasta) are good sources of fiber. Digestion requires a lot of energy, and it takes even more of a toll when your body is trying to process something it can't. After going gluten-free, you'll be putting less of a strain on your gut, and there's a good chance your energy levels will benefit.