Running Fuel for a Sensitive Stomach

Stomach trouble during long runs is common, and it usually has more than one cause. The variables below are the ones runners can actually adjust. None of this is medical advice — if symptoms are severe or persistent, talk to a doctor or a sports dietitian.

• Concentration — a very concentrated carb dose taken without enough fluid can sit heavily. Gels are designed to be taken with water.
• Hydration — under-drinking slows things down; over-drinking can leave fluid sloshing. Both feel like a stomach problem.
• Carbohydrate type — different sources and blends are tolerated differently from runner to runner.
• Ingredient tolerance — sugar alcohols, caffeine, high fiber, or high fat in a fueling product can each be a culprit.
• Sweetness — intense sweetness repeated every 30 minutes can trigger nausea even when digestion is fine.
• Texture — if a product makes you gag, you'll skip servings, and under-fueling has its own consequences.
• Fueling too aggressively — jumping straight to a high carbs-per-hour target without training your gut is a frequent cause.

Change one variable at a time on training runs and keep short notes. A single bad race tells you very little; three consistent long runs tell you a lot.

Tolerance for carbohydrate during exercise improves with practice. Start at a conservative amount per hour, hold it for a few weeks of long runs, then step up. Use the same fuel, at the same pace, that you plan to use on race day.

GoDough is a soft rice-dough bite with 20g of carbohydrate and 100 calories per serving, made with a short ingredient list and no wheat, gluten, or dairy ingredients. It's less sweet than a typical gel and eaten in about four bites rather than gulped.

We're not going to tell you it will settle your stomach — we don't have evidence for that, and GI response is highly individual. What we can say is that if sweetness and gel texture are what put you off fueling, GoDough is a different option to test in training.