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* If you normally run on an empty stomach, try a little carbohydrate just before you run. I've found that one or two Gu Chomps (or similar) can help settle my stomach if it's feeling particularly empty. Take it within 5 minutes of starting your run to avoid a blood sugar crash.
* If you normally run after eating, try eating less, or leaving a longer gap between eating and running.
* Record what you eat for your previous meal, which might be the night before, and see if different things make things better or worse. Foods that cause digestive gas can cause problems for some time as can some carb-loading approaches like pasta. I had an intolerance for soy protein [[Protein]] that took me months to track down.
* Try taking a Gas-x before running. It removes the bubbles in your stomach (anti-foaming) and is not absorbed into the blood stream, so there should be no downsides.
* Many people find a little ginger can help settle the stomach, so a little ginger ale or ginger beer could help. Ginger chews also help, or some crystallized ginger. Like the chomps, take it within 5 minutes of starting your run to avoid a blood sugar crash.
* NSAIDs, such as ibuprofen and aspirin irritate the stomach and should be avoided. They prevent healing as well – [[NSAIDs and Running]]
* If you take a drink with too much salt, it can upset your stomach. However, in my experience, the drink becomes unpalatable well before it upsets the stomach.
* If you're taking electrolyte capsules[[Electrolyte Capsules]], these can take time to dissolve, and build up in your stomach. See [[Electrolyte Capsules]] for more details.
* On ultramarathons, eating what you believe you should eat, rather than being guided by your appetite and eating what appeals can cause stomach problems.
* Anti-acids can settle your stomach, but too much can prevent digestion. Taking regular anti-acids also tends to cause your stomach to produce more acid over time (up regulation).