5 Reasons the Fibermaxxing Trend Is Making You Feel Worse (and How to Fix Each One)

Fiber is having a moment.

The wellness trend known as fibermaxxing, where people aggressively ramp up their fiber intake in pursuit of better gut health, lower cholesterol and steadier blood sugar—has taken over social media.

The intention is good. Most Americans don’t eat nearly enough fiber. But “maxxing” anything comes with risks, and going too hard, too fast can leave you bloated, gassy and worse off than when you started.

That’s why most dietitians are both for it and against it.

The truth is that fiber genuinely works. It supports digestion, feeds beneficial gut bacteria, helps regulate blood sugar and lowers cholesterol. But the problem isn’t the goal—it’s the approach.

“Maxxing can be a bad idea for many people,” Sara Rosenkranz, professor of nutrition science at UNLV, said in an interview with TIME. “Optimization is what we really want, where we’re getting adequate fiber along with other nutrients.”

Heather Butscher, RDN, shared a similar sentiment with University Hospitals.

“When the goal is to naturally increase dietary fiber intake for health benefits, the intention is good,” Butscher said. “But in nutrition, excessive intake of any nutrient can have unintended consequences.”

The 5 mistakes most people make when fibermaxxing

So where does fibermaxxing go wrong? For most people, it’s not one big mistake, it’s a combination of small ones that compound quickly.

The bloating, cramping and uncomfortable digestive consequences that turn people off the trend entirely are almost always avoidable if you know how to increase your intake properly.

Here’s what dietitians say trips people up most often, and what to do about it.

1. You’re eating too much fiber at once

Here’s the thing about fiber: your gut bacteria love it, but moderation is key.

“When you eat more of it, a bunch of gut bacteria get to work fermenting it, which creates gases that cause bloating, abdominal pain, and cramping,” says Rekha Chaudhary, MD, per UC Health.

A more manageable approach is spreading your intake across the day, aiming for around 10 grams per meal with high-fiber snacks filling in the gaps.

2. You ramped up too quickly

The people most likely to feel the painful side of fibermaxxing aren’t seasoned whole-grain eaters.

“They are the people who are eating 10-15 grams of fiber a day or less. And now they’ve suddenly dropped a 14-gram fiber bomb into a gut that has no idea what’s about to happen,” Dr. Karan Rajan, a UK-based NHS surgeon, shared on Instagram.

Your digestive system needs time to adjust. If you’re currently under the recommended daily amount, try increasing by five grams per week until you get there.

3. You forgot about water

Fiber and water are a package deal. As fiber moves through your digestive tract, it absorbs water, and if there isn’t enough of it, things can get uncomfortably backed up.

“If you don’t have enough water in your system, the fiber can form a bulky stool that is difficult to pass,” says registered dietitian Ashlee Carnahan of Henry Ford Health.

The fix is simple: aim for at least eight cups a day and try to drink a glass with every fiber-containing meal or snack.

4. You’re eating the same high-fiber foods on repeat

Can you eat too much fiber from a single source? The real issue is that relying on just one or two high-fiber foods means you’re missing out on the variety your gut actually needs. Different fruits, vegetables, beans and whole grains feed different gut bacteria and bring different nutrients to the table.

Try swapping one low-fiber food for a high-fiber alternative each week and rotating what you pick. Don’t be afraid to try new things, if you don’t like something, there’s plenty more sources to try.

5. You’ve replaced whole foods with supplements

Fiber supplements aren’t a bad tool, but they’re a poor substitute for actually eating high-fiber foods.

“Food sources provide not just fiber, but also vitamins and minerals that supplements may not have,” says Carnahan. When you’re getting fiber from real food, your body benefits from everything that comes with it.

A good rule of thumb: aim for at least 25 grams from whole foods daily and let supplements top you off from there.

The bigger takeaway here is that fiber is worth prioritizing, just not obsessing over.

“Just try to be consistent with fiber and make sure you’re including it in meals throughout the day,” registered dietitian Yasi Ansari told TIME. Steady and strategic will always beat sudden and excessive.

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This story was originally published June 10, 2026 at 9:39 AM.