Fibermaxxing Explained: The 2026 Food Trend That Dietitians Actually Like

For years, the loudest voice in nutrition was protein. Protein bars, protein coffee, protein everything, on the theory that more was always better. In 2026, a rival has muscled onto the menu, and for once the experts are not rolling their eyes. It is called fibermaxxing, and unlike most things that go viral on TikTok, this one has the science behind it.

Here is what fibermaxxing means, why dietitians are cautiously cheering it on, and how to do it without making yourself miserable in the process.

What Fibermaxxing Actually Is

Fibermaxxing is the practice of intentionally maximizing the fiber in your diet — building meals and snacks around fiber-rich foods like vegetables, fruit, beans, lentils, nuts, and seeds, and in some cases adding fiber supplements on top. The name is a TikTok creation, born from millions of views under the hashtag, but the underlying idea is as old as nutrition advice itself.

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What makes it notable is the contrast with last year’s obsession. The protein craze fixated on a nutrient most Americans already get plenty of. Fiber is the opposite: roughly 95% of Americans fail to meet the recommended intake, according to figures cited in coverage of the trend. So a viral push toward more fiber is, unusually, a viral push toward something people genuinely lack.

Even the food giants have noticed. PepsiCo’s CEO told analysts in late 2025 that “fiber will be the next protein,” and McDonald’s CEO named fiber the top food trend he expects to shape the industry. New fiber-fortified products are already hitting shelves.

Why Dietitians are on Board (Mostly)

The enthusiasm from nutrition experts is real, if measured. Hannah Holscher, a nutrition professor at the University of Illinois Urbana-Champaign, told NPR she appreciates the trend precisely because fiber is “just not really a sexy nutrient that people are paying attention to,” and almost no one eats enough. Yasi Ansari, a senior dietitian at UCLA Health, framed it as encouraging people to do something most of us actually need to do.

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The benefits are well documented. Fiber lowers LDL cholesterol, slows carbohydrate absorption to help with blood-sugar control, and feeds the gut microbiome. Falling short is linked to higher risk of heart disease, diabetes, and certain cancers. The Dietary Guidelines for Americans recommend roughly 22 to 34 grams a day depending on age and sex, and most adults land well under that.

The Catch, and Why “more” can Backfire

Here is where the experts add their asterisk. The danger of any “maxxing” framing is the implication that there’s no upper limit, and with fiber there practically is one — at least for your comfort.

Dietitian Rosanne Rust warns that, like many TikTok trends, this one can do harm if approached carelessly. The classic mistake: most people have no idea how much fiber they currently eat, then add 20 grams or more overnight to fix bloating, which tends to produce exactly the bloating and gas they were trying to avoid. The fix is unglamorous but simple — increase fiber gradually and drink enough water as you do, so your digestive system can adjust.

There is also a quieter correction underway in the expert conversation, away from sheer quantity and toward variety. Mintel’s 2026 food report describes the focus moving “from maximization to balance.” The reasoning, as dietitian Melanie Murphy Richter explains, is that different plant fibers feed different bacterial species in your gut, and a diverse microbiome tracks with better health across multiple measures. In other words, eating 40 grams of fiber all from one source is less useful than spreading it across beans, oats, berries, nuts, and vegetables.

Candace Pumper, a dietitian at Ohio State, offered maybe the cleanest reframe: the goal should be “fibermeeting,” not fibermaxxing — hitting the recommended amount most people miss, rather than chasing an ever-higher number.

How to Do it Sensibly

If the trend nudges you toward more plants, that is a good thing. A few grounded principles keep it healthy rather than faddish:

• Find out where you’re starting. Before adding anything, get a rough sense of your current intake. The whole bloating problem comes from people who don’t know their baseline making big jumps.
• Go gradual, and hydrate. Build up over days and weeks, not in a single ambitious grocery haul, and drink more water as your fiber climbs.
• Prioritize diversity over a single big number. A range of plant sources beats a mountain of one. Beans, lentils, oats, berries, leafy greens, nuts, and seeds each bring something different.
• Favor food over supplements where you can. Whole foods deliver fiber alongside other nutrients; powders and supplements can fill gaps but work best as a supplement to a varied diet, not a replacement for it.
• Aim to meet, not to max. The recommended 22 to 34 grams a day is a target most people miss. Hitting it is the win. Pushing far past it mostly buys discomfort, not extra health.

The Bottom Line

Fibermaxxing is that rare viral trend that points people toward something they need more of. The science on fiber is solid, the deficit is real, and any movement that gets people eating more beans and berries is hard to argue with. The only trap is the “maxxing” mindset itself — treat it as a push to meet your fiber needs with a variety of plants, raise your intake gradually, and drink your water, and you get the upside without the bloated downside.

If you have a digestive condition or any concerns about your diet, talk to a doctor or registered dietitian before making big changes.

Sources

• NPR — “The ‘fibermaxxing’ trend has health benefits worth the hype“ (Hannah Holscher, University of Illinois)
• U.S. News & World Report — “Fibermaxxing: A Dietitian Explains“ (Rosanne Rust)
• Ohio State University Health — “What’s fibermaxxing, and is it good for you?“ (Candace Pumper)
• Johns Hopkins Center for a Livable Future — 2026 food trends and fiber data
• Business Insider — PepsiCo’s CEO says fiber will be the next protein
• UCLA Health (Yasi Ansari) — Is ‘fibermaxxing’ a sound nutrition trend?

Disclaimer: This article is informational and not medical or nutritional advice. Fiber needs and tolerances vary; consult a doctor or registered dietitian for guidance specific to you, especially if you have a digestive or other health condition.