Gut health expert warns "fibermaxxing" trend could backfire with dangerous side effects
By isabelle // 2025-09-30
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  • Fiber is essential for digestion, heart health, and cancer prevention but extreme intake can cause bloating, constipation, and nutrient deficiencies.
  • Experts warn against fibermaxxing, a trend of consuming 40 to 50g daily, which is far beyond the recommended 30g.
  • Sudden fiber increases without hydration can lead to mineral malabsorption and worsen symptoms for those with gut conditions.
  • Whole foods like fruits, vegetables, and whole grains are better fiber sources than processed powders or supplements.
  • Gradual fiber increases, proper hydration, and consulting a healthcare provider are recommended for optimal gut health.
For years, dietary fiber was dismissed as little more than roughage—something that passed through the body without much benefit. But now, science confirms its critical role in digestion, heart health, and even cancer prevention. Yet, as with many wellness trends, some people are taking it too far. A new social media craze called "fibermaxxing"—where individuals consume 40 to 50 grams of fiber daily (far beyond the recommended 30g)—is gaining traction, but experts warn it could do more harm than good. Dr. Max Gowland, a PhD-qualified biochemist with more than 40 years of experience, explains that while fiber is essential, extreme intake can lead to bloating, constipation, digestive blockages, and even nutrient deficiencies. "Going overboard with fiber can backfire, causing bloating, gas, cramping, or constipation," he told the Daily Mail. "Too much fiber too quickly can irritate the gut and overwhelm the digestive system."

The risks of too much fiber

Fiber is crucial for gut health. It helps move waste through the digestive tract, supports microbiome diversity, and may reduce the risk of colon cancer. However, suddenly increasing fiber intake without proper hydration can lead to serious issues, including mineral malabsorption (calcium, iron, magnesium, and zinc) and worsened symptoms for those with IBS or inflammatory bowel disease. Dr. Gowland emphasizes that balance is key. "Fibermaxxing can create a false sense of being 'super healthy' while ignoring overall diet balance," he said. Instead of extreme fiber consumption, he recommends gradual increases, plenty of water, and whole-food sources—not processed powders or supplements, which can cause additional digestive distress.

Why whole foods are better than supplements

Many fibermaxxing enthusiasts turn to powders, bars, and processed high-fiber snacks to hit their targets. But Dr. Gowland warns that these can be problematic. "Heavily processed fibers can cause bloating and digestive discomfort," he said. "Some artificial fibers are added to foods primarily for marketing or texture, not health." Natural fiber sources—like fruits, vegetables, nuts, seeds, and whole grains—provide not just fiber but also vitamins, minerals, and antioxidants that support overall health. The NHS recommends a balanced diet with at least five portions of fruits and vegetables daily, along with whole grains and legumes, to meet fiber needs safely.

Who should avoid fibermaxxing?

People with irritable bowel syndrome (IBS), Crohn’s disease, or ulcerative colitis may experience worsened symptoms if they suddenly increase fiber intake. Robin DeCicco, a certified holistic nutritionist, cautioned that anyone with pre-existing gut issues should adjust their fiber intake carefully and consult a healthcare provider. For those looking to boost fiber, DeCicco advises small, gradual increases—starting with 1-2 teaspoons of chia or flaxseeds before working up to full servings. She also recommends cooking vegetables (rather than eating them raw) to ease digestion and drinking plenty of water to prevent constipation.

Fiber is good, but moderation matters

Fiber is undeniably beneficial. It supports digestion, heart health, and even reduces cancer risk by helping remove toxins from the body. However, more isn’t always better. The key is gradual increases, proper hydration, and whole-food sources rather than extreme intake. As Dr. Gowland puts it: "Fiber is a tool, not a magic solution." Instead of chasing trends, focus on a balanced, varied diet. Your gut will thank you. Sources for this article include: DailyMail.co.uk ScienceAlert.com FoxNews.com MSKCC.org
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