I ended up down a runner forum rabbit hole late one night after the kids were asleep. Thread after thread described the same pattern from runners who had no celiac diagnosis: they cut wheat for a season, felt their stomach settle, watched their pace stay the same, and decided to stay gluten-free regardless. I recognized the impulse from my own kitchen, but my reason sits in a biopsy report tucked in a drawer. That night sent me looking.

Dana Lis and her colleagues at the University of Tasmania surveyed 910 athletes without celiac disease. Among them, 41 percent followed a gluten-free diet at least half the time. I read that number as a sign that wheat avoidance among athletes was common, but it did not tell me what those runners gained.

What 910 Athletes Told Researchers

For someone with celiac disease, gluten-free eating is a medical treatment. When gluten stops triggering the immune response, the small intestine gets a chance to heal. For everyone else, wheat avoidance is a choice, and that survey showed it was a common one among athletes.

From that survey, I could see how many athletes skipped gluten. What I could not see was whether those runners recovered faster, slept better, or held a faster pace. Dana Lis and her team took on that question directly in a controlled trial.

A Controlled Crossover in 13 Cyclists

Dana Lis and her team at the University of Tasmania recruited 13 competitive endurance cyclists without celiac disease for a randomized crossover trial. Each athlete spent one week eating gluten-containing meals and one week eating gluten-free versions. The researchers kept calories, carbohydrate, and protein matched across both weeks, and the athletes did not know which week was which.

Then the team measured what changed. Time-trial performance, gut symptoms, inflammation markers, and general well-being all stayed the same. The team published the results in Medicine & Science in Sports & Exercise.

That result pushed me toward a different question. If removing gluten did not change performance in a controlled setting, why did so many runners report a calmer stomach without wheat? I found gastroenterology research pointing toward a different component of wheat.

Fructans Show Up More Than Gluten

Wheat carries more than gluten. It also contains fructans, a type of fermentable short-chain carbohydrate found in onions, garlic, barley, and rye. In a sensitive gut, fructans can ferment quickly and pull water into the intestine. That leads to bloating, cramping, and urgent bathroom stops mid-run. A runner removes wheat, feels better, and credits gluten. In many cases, the fructan load was the trigger.

A 2018 trial published in Gastroenterology tested this. Researchers gave people with self-reported gluten sensitivity three kinds of bars. One bar contained gluten, one contained fructans, and one contained neither. The bars looked and tasted alike. The fructan bars provoked the most GI symptoms. The gluten bars performed no worse than the placebo.

That finding matters for race week. Fructans fall under the FODMAP umbrella, and a full low FODMAP diet is hard to sustain through training. If fructans are the issue, a short-term low FODMAP approach around race day is one tool a sports dietitian may use. The research does not apply to anyone with celiac disease, where gluten causes damage even when no obvious gut symptoms appear.

The Carbohydrate Gap

Gluten-free runners face a carbohydrate gap. Endurance athletes rely on stored glycogen, and glycogen comes from carbohydrate. The Academy of Nutrition and Dietetics and the American College of Sports Medicine recommend 5 to 7 grams of carbohydrate per kilogram of body weight each day for moderate endurance training. A 150-pound runner, roughly 68 kilograms, needs about 340 to 480 grams of carbohydrate daily. That number climbs on long run days.

Carbohydrate sources that work without wheat include:

• Rice
• Potatoes
• Corn
• Quinoa
• Certified gluten-free oats
• Rice-based pastas

I see the gap most often in packaged gluten-free swaps. When I compare labels in the bread aisle, some gluten-free loaves deliver less carbohydrate and more fat than the wheat loaf next to them. Swap your usual sandwich bread for a lower-carb gluten-free loaf and skip replacing the missing carbohydrate, and your training day drifts toward fat and protein without meaning to. You end up with lower glycogen than planned.

I felt this at home. On weeks when I traded wheat pasta for cauliflower rice and called it a training swap, my long runs turned sluggish. I added carbohydrate back using rice, sweet potatoes, and gluten-free oats. The sluggishness lifted.

Fueling Without Wheat

I now plan gluten-free training meals around carbohydrate first, then protein and fat. For a pre-long-run dinner, I cook Clean Monday Meals ramen noodles, which come from a single ingredient: organic brown rice flour. One 70-gram cake gives a dependable carbohydrate base without the wheat. I add chicken and vegetables, and I use Clean Monday Meals Chicken Bouillon for a broth free of MSG and seed oils. That dinner sits well the night before a hard run and leaves a full glycogen target for race morning.

Race-morning breakfasts rotate through rice cakes with honey and banana, certified gluten-free oats cooked with water and topped with maple syrup, or a smoothie with fruit and gluten-free protein powder. Each breakfast centers on carbohydrate from whole foods, eaten early enough to digest.

For workouts longer than 90 minutes, I pack fuel made from glucose or maltodextrin, both gluten-free by nature, and I pair it with water. I read the label because flavorings and thickeners sometimes contain wheat. That habit comes from living with celiac in the house, and it carries over to running fuel.

What I Landed On

I now talk to other moms and runners about gluten differently because of that research. Celiac disease requires strict gluten avoidance. For a newly diagnosed runner, that first year is hard, and the fear of cross-contact at races and aid stations is real. For a runner without celiac disease, the controlled studies I found showed no performance boost from going gluten-free. If wheat causes gut symptoms, fructans deserve a look before gluten takes the blame. And for every gluten-free athlete, the bigger risk is falling short on carbohydrate while chasing a clean label.

Our kitchen stays gluten-free because my family needs it. I keep my training fueled because my pace depends on carbohydrate, timing, and consistency. Those are the three I plan around.

If you need gluten-free dinner ideas that hold up through marathon training, the Clean Monday Meals Recipe App filters by gluten-free and dairy-free and builds the grocery list to match. That is where I keep our training meals organized when the week gets busy.