Athletes & Sports
Do elimination diets actually improve performance?
High-profile athletes like Novak Djokovic have made gluten-free and elimination diets look like a performance secret. Controlled research tells a more boring story.
What the research actually shows
In athletes without celiac disease or a diagnosed gluten sensitivity, controlled trials have found that a short-term gluten-free diet produces no measurable change in performance, gastrointestinal symptoms, or inflammatory markers compared to a normal mixed diet.[9] That holds despite gluten-free eating being popular among endurance athletes specifically for perceived performance and gut-comfort benefits.
So why do some athletes swear by it?
A few likely explanations that don't require gluten itself being the problem: cutting gluten usually means cutting a lot of processed food, refined sugar, and low-fiber packaged carbs at the same time — the same changes that show up in a lot of "clean eating" diets that improve digestion and energy regardless of gluten. There's also a real placebo effect in sports performance, and undiagnosed non-celiac gastrointestinal sensitivity does exist in a minority of people, even without full celiac disease.
The actual risk
Going gluten-free (or removing any other whole food group) without medical guidance can crowd out fiber, B vitamins, and iron that are otherwise easy to get from whole grains and fortified foods — see our fiber benefits guide and micronutrients vs. macronutrients for what's actually at stake. If you suspect a real gluten or food sensitivity, that's worth testing for directly rather than guessing with a self-imposed elimination diet.