From broccoli to bananas, plenty of vegan foods are packed with fiber. This nutrient supports healthy digestion, but there are downsides to consuming a lot, especially for runners. But can runners eat too much fiber? Here are the facts to keep in mind as you plan your vegan diet to support your running endeavors. 

What Is Fiber?

In a nutshell, dietary fiber is a type of carbohydrate that our bodies can’t break down, so it exits our systems relatively intact. There are two main types of fiber:

• Soluble fiber
• Insoluble fiber

Soluble fiber dissolves in water and takes on a gel-like consistency in our digestive tract. Bananas are a great example of a soluble-fiber-rich food.

On the other hand, as you might be able to guess, insoluble fiber doesn’t dissolve in water. It adds substance to our stool and promotes healthy bowel movements.

The Benefits of Fiber

Fiber’s main job is supporting intestinal and digestive health. Here’s a breakdown of its main benefits:

• Helps you poop regularly
• Lowers LDL cholesterol levels
• Makes you feel fuller
• Promotes a healthy digestive tract

The Problems Too Much Fiber Can Cause for Runners

So what’s the problem? Everything up until this point makes fiber seem like the best. 

Well, the saying “too much of a good thing” holds true for fiber. Here are the main problems it can cause: 

• Stomach pain/gassiness 
• Constipation
• Diarrhea 

It might seem odd that fiber can cause the very issues it also prevents, but it makes sense. For example, fiber absorbs water and adds substance to stool, but too much fiber can make the stool back up and lead to constipation. Likewise, an appropriate amount of fiber helps stool pass through the body smoothly, but too much fiber makes the body do this too well, leading to diarrhea.

Why the Issue Is Harder for Vegan Runners

Everyone can eat too much fiber. However, the problem is trickier for vegans and runners, and especially for vegan runners.

Vegans eating a lot of whole foods are probably consuming a fiber-rich diet. This is because they are eating a ton of whole grains, fruits, vegetables, and legumes, all of which contain lots of dietary fiber. Therefore, though it’s easier for vegans to meet their recommended fiber intake, it’s just as easy to exceed it.

Now let’s talk about runners. Ever been trotting along when, all of a sudden, your stomach pinches and tightens, causing you to grimace with each stride? These unfortunate cramps can have many causes, and one of them is fiber. Because our bodies can’t digest fiber, it takes up space in our stomachs and slows the release of glucose, both of which can cause discomfort while running. 

So what hope is there for vegan runners if we’re eating a lot of fiber and running a lot? The good news is that you might not have to restrict your fiber intake to enjoy cramp-free running.

How To Regulate Your Fiber Intake

Here are the best tips to regulate your fiber intake, helping you stay comfortable on runs and gastrointestinally healthy.

Know the Recommended Fiber Intake

Aim to consume 25–30 grams of fiber a day. If you plan your meals with a fiber-rich base (such as whole-grain rice) and a vegetable or fruit, you’ll almost definitely meet this marker. Try to plan tasty recovery meals around this principle. However, remember that it is just a guideline; you should discuss with your healthcare provider or dietician to modify your ideal fiber intake for your needs.

Balance Fiber Consumption With Water

Fiber won’t make you constipated if you balance your intake with plenty of water. So drink up!

Avoid High-Fiber Foods 1-2 Hours Before a Run

Maybe it’s when you’re eating fiber, not how much of it you’re eating. If you’re snacking on salads and whole grains before your runs, no wonder you’re feeling gassy and cramped! Give your body time to process fiber before jostling your stomach around on a run.

Make Sure You’re Eating Enough Calories

Since fiber helps you feel full, you might not eat enough calories by the end of the day if most of your meals are fiber-based. This can hamper your athletic performance and recovery, and we don’t want that. If you notice you’re not eating enough throughout the day, maybe consider lowering your fiber intake and consuming more affordable, protein-rich foods.

Overall, it’s definitely possible for runners to eat too much fiber. However, there’s no need to worry. Now that you know the facts, you can tailor your diet to include plenty of fiber-rich foods without having them impede your runs.

Keep in mind that this is not meant to be medical advice. As I mentioned, you should consult with your healthcare provider for professional, tailored advice. This blog is merely to inform you and give you a starting point to explore this facet of your health.