The Best Foods for Runners with Sensitive Stomachs: What to Eat Before, During, and After a Run

In my last article, we explored why digestive issues are so common among runners. Between changes in blood flow, the impact of running, and the stress exercise places on the body, it's no surprise that many runners experience bloating, cramping, nausea, or an urgent need to find a bathroom.

The good news? Nutrition can make a big difference.

What you eat before, during, and after a run can help support energy levels, reduce digestive discomfort, and improve recovery. And despite what social media might suggest, there isn't one perfect fueling plan for every runner.

The best fueling strategy is the one that supports your performance while feeling good in your body.

The First Rule: Don't Wait Until Race Day

One of the biggest contributors to digestive issues is trying something new during an important workout or race.

Your digestive system can adapt to exercise nutrition just like your muscles adapt to training. This process is often called "gut training."

The more consistently you practice eating and drinking around workouts, the better your digestive system becomes at handling fuel during exercise.

Think of fueling as a skill—not just a nutrition recommendation.

What to Eat Before a Run

The goals of pre-run nutrition are to:

• Provide energy

• Reduce hunger during exercise

• Minimize digestive discomfort

• Support performance

• Protect muscles from breakdown

In general, carbohydrates are your body's preferred fuel source for running.

For many runners, foods that are lower in fiber and fat tend to be easier to digest immediately before exercise.

30-60 Minutes Before a Run

If you're heading out soon, keep it simple.

Examples:

• Banana

• Applesauce pouch

• Graham crackers

• Pretzels

• Toast with jam

• Sports drink (with real sugar)

• Fig bars

• Fruit gummies

• Low-fiber granola bar

• Bagel

• Toaster waffle

1-2 Hours Before a Run

You may tolerate a larger snack or small meal.

Examples:

• Oatmeal with banana

• Bagel with peanut butter

• Yogurt and cereal

• Toast with eggs and fruit

• Rice with scrambled eggs

2-4 Hours Before a Long Run or Race

Many runners feel best with a balanced meal that includes carbohydrates, protein, and some fat.

Examples:

• Bagel, eggs, and fruit

• Oatmeal with nuts and berries

• Rice bowl with chicken and vegetables

• Pancakes with peanut butter and banana

Foods That Sometimes Cause Problems

Not everyone reacts the same way, but some runners notice more symptoms when they eat large amounts of:

• High-fiber foods

• Greasy or fried foods

• Large portions

• Alcohol

• Very spicy foods

This doesn't mean you need to avoid these foods altogether. Instead, consider whether timing adjustments may help.

Using sports drinks or powders can be a great way to consume carbohydrates, sodium and water before, during and after a run.

Fueling During a Run

Many runners can comfortably complete shorter runs without fueling during exercise.

As duration increases, however, carbohydrate intake becomes increasingly important for both performance and comfort. Ironically, under-fueling can sometimes contribute to nausea, fatigue, dizziness, and GI distress.

Runs Under 60 Minutes

Most runners can rely on stored glycogen and simply focus on hydration as needed.

Runs Lasting 60-90 Minutes

Runners benefit from various amounts of carbohydrates, particularly if intensity is high.

Examples:

• Sports drink (with sugar!)

• Chews

• Sports gels

• Dried fruit

Runs Longer Than 90 Minutes

Carbohydrate intake becomes much more important.

A general target is:

• 30-60 grams carbohydrate per hour for many runners

• Up to 90 grams per hour for experienced athletes who have trained their gut

Examples:

• Energy gels

• Sports chews

• Sports drinks

• Bananas

• Applesauce packets

• Dates

• Low-fiber bars

Practice Your Race Fuel (seriously, it’s as important as your training)

The goal of long training runs isn't just building endurance, it’s to train your gut as well.

• Try various gels, chews, snacks and hydration mixes. Which ones taste good? Which ones are easiest for you to eat and drink

• As you increase mileage, increase the frequency and amount of carbohydrate from both food and fluids

The more often you practice, the fewer surprises you'll encounter on race day.

Half Marathon Runners

Training runs often range from 60 minutes to 2+ hours.

Focus on:

• Practicing pre-run meals

• Hydration strategies

• Taking carbohydrates during longer runs

Example long-run fueling:

• Bagel with peanut butter and water 2 hours before

• Graham crackers and juice 30 minutes before

• Gel every 30 minutes

• Water + sports drink throughout

Marathon Runners

The marathon is often where fueling becomes performance-limiting.

Many GI issues occur because runners attempt to consume more carbohydrates than they've practiced.

Focus on:

• Consistent carbohydrate intake; endurance runners need a lot of carbohydrates

• Gut training

• Race-day hydration strategy

Example:

• Oatmeal, banana, and sports drink before race

• 30-60+ grams carbohydrate per hour during race

• Variety of gels, chews, sports drink

• Recovery meal afterward

Oatmeal with honey or sugar and fruit can be a yummy breakfast and pre-run meal to give you lots of energy.

Ultra-Endurance Runners

Ultra runners face unique challenges because events last for many hours.

In addition to carbohydrates, they may benefit from:

• More variety in foods (food fatigue can lead runners to unintentionally underfuel)

• Salty options

• Foods with different textures

• Strategic protein intake during very long events

Examples:

• Potatoes

• Pretzels

• Rice balls

• Bananas

• Energy chews

• Sandwich pieces

• Sports drinks

Ultra fueling is highly individual, which makes training your gut especially important.

Don't Forget Recovery

Recovery nutrition isn't just about muscle repair. It also helps replenish energy stores and prepares you for your next workout. Aim to include both carbohydrates and protein after training.

Examples:

• Chocolate milk and fruit

• Greek yogurt with granola

• Smoothie with fruit and protein

• Rice bowl with chicken or tofu

• Sandwich and fruit

Many athletes feel best when they eat within 30 minutes after exercise rather than delaying food for extended periods.

The Bottom Line

Digestive comfort and performance go hand in hand.

For many runners, the key is not finding the "perfect" food but developing a fueling strategy through practice, curiosity, and consistency. Eating enough, timing meals appropriately, staying hydrated, and training your gut can all help reduce GI distress while supporting your energy and recovery.

Remember: the goal isn't to eat less, avoid entire food groups, or earn your food through exercise. The goal is to fuel your body in a way that helps you run strong, recover well, and enjoy the process.

In the next article, we'll explore what happens when digestive symptoms persist, including practical strategies for runners living with IBS, bloating, food sensitivities, and other chronic digestive concerns.