Why Do Gels Upset My Stomach And How To Fix It

Energy gels are designed to provide a quick and convenient source of carbohydrates during training and racing. For some athletes, though, they can also bring unwanted side effects such as bloating, nausea, cramping or an urgent need for the toilet. If this sounds familiar, you are not alone. Understanding why gels can upset your stomach is the first step to solving the problem.

Why Gels Can Cause Digestive Problems

When you exercise at intensity, your body prioritises working muscles over digestion. This reduced blood flow to the gut means your digestive system has less capacity to break down and absorb food. Combine that with concentrated sugars, and problems can occur.

The most common triggers include:

• High sugar concentrations: If more carbohydrate arrives in the gut than can be absorbed, it lingers, drawing in water and fermenting. This leads to bloating and cramps.
• Lack of fluid: Taking gels without water can slow digestion. On the other hand, drinking too much plain water can dilute electrolytes and upset balance.
• Pre-exercise diet: High-fibre, fatty, or heavy meals before training can increase the risk of gut distress.
• Individual sensitivity: Some athletes are simply more prone to GI issues, and stress or nerves before a race can make things worse.

How To Reduce Stomach Upset From Gels

The best way to manage these issues is to take a structured approach to fuelling. Start with gut training: practise taking gels in training sessions so your digestive system adapts gradually to higher carb intakes.

Other practical fixes include:

• Pick gels with multiple carbohydrate sources such as glucose and fructose. This allows your body to use more than one absorption pathway and reduces the risk of sugar overload.
• Take small sips of water with gels rather than none at all or large gulps. This helps the gel absorb efficiently without sloshing in the stomach.
• Adjust your pre-race meals to focus on simple, low-fibre carbohydrates like rice, pasta, or white bread in the 24 hours before competition.
• Test in training, never in racing. Use long runs or rides to figure out which gels and timings work for your body.

Personalise Your Strategy

Every athlete’s carbohydrate needs are different, and so are their digestive tolerances. Our Nutrition Calculator can help you work out exactly how many grams of carbohydrate you should be aiming for each hour of training or racing. With this knowledge, you can build a fuelling strategy that matches your body, sport and event distance, while reducing the risk of stomach issues.

FAQ

1. How do I know if I’m using too many gels?
   If you feel bloated, nauseous, or develop cramps despite good hydration, you may be exceeding your personal carbohydrate tolerance. Using a nutrition calculator can help you find the right balance.
2. Are there gels for sensitive stomachs?
   Yes, there are a number of options that have been designed for athletes who struggle, including:
   Maurten Gel 100: Features hydrogel technology that helps reduce the risk of stomach upset and cramps.
   Hüma Chia Energy Gel: Made with 100% all-natural ingredients and real fruit, ideal for those sensitive to synthetic gels or prone to GI issues.
   GU Liquid Energy Gel: Contains a reliable formula of fast-absorbing carbohydrates in smooth and light texture for easy digestion
   Active Root Energy Gel: These gels feature ginger root extract that not only soothes the stomach but actively combats bloating and nausea.
3. Can I use real food instead of gels?
   Yes, many athletes use alternatives such as bananas, dried fruit, or energy chews. However, gels are often more practical and easier to carry during races.
   

Final Thoughts

Energy gels can upset the stomach if taken without a plan, but with the right approach they can become a reliable part of your fuelling strategy. By training your gut, choosing the right gels, managing fluid intake and testing your routine before race day, you can keep your stomach settled and your energy topped up. If you would like tailored advice on choosing or using gels, the XMiles team is always here to help, just get in touch.

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