Fibremaxxing and Gut Health: Why Too Much Fibre Could Upset Your Digestive System

Introduction: When a Healthy Habit Goes Too Far

Fibre has long been recognised as an essential part of a healthy diet. It supports digestion, helps maintain regular bowel movements, and plays an important role in keeping the gut microbiome balanced. However, a new online wellness trend called “fibremaxxing” is encouraging people to dramatically increase their fibre intake, sometimes far beyond recommended levels.

The idea behind fibremaxxing is simple: if fibre is good for the body, then consuming more must be even better. Social media influencers have promoted high-fibre diets featuring large amounts of beans, lentils, whole grains, fruits, vegetables, and fibre supplements. Many people are aiming for more than 50 grams of fibre per day, despite general recommendations being around 25 to 30 grams daily for many adults.

While increasing fibre intake can offer real health benefits, taking it to extremes may create digestive problems instead of improving gut health.

What Is Fibre and Why Does Your Gut Need It?

Dietary fibre is a type of carbohydrate that the human body cannot fully digest. Unlike sugars and starches, fibre passes through the small intestine and reaches the large intestine, where it interacts with trillions of microorganisms that make up the gut microbiome.

These gut bacteria use certain types of fibre as fuel and produce compounds called short-chain fatty acids. These substances are linked to several health benefits, including supporting the health of the intestinal lining and helping regulate inflammation.

Fibre also helps improve bowel movements by absorbing water and adding bulk to stools. This can make stools softer and easier to pass, reducing the likelihood of constipation.

For some people with digestive conditions such as irritable bowel syndrome, increasing fibre intake can improve symptoms, particularly when constipation is a major issue. Fibre-rich diets have also been associated with a lower risk of certain diseases, including colorectal cancer, partly because fibre supports healthy bowel function and promotes the production of beneficial compounds in the colon.

However, the type and amount of fibre matter.

Why Fibremaxxing Can Cause Digestive Problems

The gut is a complex ecosystem that depends on balance. Suddenly introducing very large amounts of fibre can overwhelm the digestive system, especially if the increase happens quickly.

Common side effects of excessive fibre intake include:

• Bloating
• Gas
• Stomach cramps
• Changes in bowel habits
• Diarrhoea or constipation

A sudden increase in fibre can also create discomfort because gut bacteria need time to adapt to dietary changes.

Another important factor is that not all fibre is the same.

Understanding Different Types of Fibre

There are several types of dietary fibre, and each plays a different role in digestion.

Soluble fibre dissolves in water and forms a gel-like substance in the digestive tract. It slows digestion and can help regulate blood sugar levels while keeping you feeling full for longer. Foods such as oats, beans, lentils, and some fruits contain soluble fibre.

Insoluble fibre does not dissolve in water. It adds bulk to stools and helps food move through the digestive system. Whole grains, wheat bran, and many vegetables are good sources.

Fermentable fibre is another important category because it provides food for beneficial gut bacteria. However, some fermentable fibres can trigger digestive symptoms in people who are sensitive to certain carbohydrates known as FODMAPs.

FODMAPs include fermentable carbohydrates that some people with irritable bowel syndrome struggle to absorb. Eating large amounts of these foods may increase symptoms such as bloating, abdominal discomfort, and irregular bowel movements.

A healthy gut benefits from variety rather than focusing on one specific type of fibre.

The Problem With Chasing Extreme Fibre Targets

One concern with fibremaxxing is that people may become focused on hitting a specific number rather than eating a balanced diet.

For example, someone trying to consume very high amounts of fibre may rely heavily on processed high-fibre cereals, powders, or supplements. While these products can contribute fibre, they may not provide the same range of nutrients found in a varied diet containing vegetables, fruits, legumes, nuts, seeds, and whole grains.

Eating the same high-fibre foods repeatedly can also reduce dietary diversity. A healthy microbiome thrives on variety because different plant foods provide different nutrients that support different types of beneficial bacteria.

More fibre does not automatically mean a healthier gut. The goal should be a balanced intake from a wide range of whole foods.

Fibre Trends and the Rise of Gut Cleansing Culture

Fibremaxxing is part of a wider online wellness culture that often promotes quick fixes and extreme approaches to health.

Similar trends include juice cleanses, detox drinks, restrictive elimination diets, and products claiming to “reset” the digestive system. These approaches often oversimplify how the body works.

The gut does not need dramatic cleanses or sudden dietary changes. It benefits from consistent habits, including eating a varied diet, staying hydrated, exercising regularly, and consuming enough fibre from natural food sources.

Some extreme cleansing practices may even be harmful. Certain laxative products, unnecessary supplements, or restrictive diets can affect hydration, nutrient intake, and the balance of the gut microbiome.

Signs You May Need More Fibre

Many people do not consume enough fibre, so increasing intake gradually can be beneficial.

Possible signs of low fibre intake may include:

• Frequent constipation
• Feeling hungry soon after meals
• Blood sugar fluctuations
• Low energy levels after eating
• Difficulty maintaining a balanced diet

Soluble fibre can help slow digestion and provide a more steady release of energy. This can support appetite control and help prevent sudden hunger after meals.

However, increasing fibre should be done gradually. Adding small portions of vegetables, legumes, whole grains, nuts, and seeds over time allows the digestive system to adjust.

How to Increase Fibre Safely

Instead of chasing extreme fibre goals, focus on sustainable changes:

• Add more plant-based foods to daily meals
• Increase fibre slowly over several weeks
• Drink enough water to support digestion
• Include different types of fibre sources
• Pay attention to how your body responds

A balanced approach is more likely to support long-term gut health than following an aggressive online trend.

Final Thoughts

Fibre is an important part of a healthy diet, and many people would benefit from eating more fibre-rich foods. However, fibremaxxing shows how a positive nutrition message can become problematic when taken to extremes.

Your gut is a sensitive ecosystem that depends on balance, diversity, and consistency. Eating a wide variety of plant foods is usually more beneficial than focusing on achieving an unusually high fibre target.

Improving gut health is not about quick fixes or extreme challenges. It is about creating healthy habits that your body can maintain over time.

Source

Adapted and written from an article by Dr Nish Manek published in BBC Science Focus Magazine, July 2026, discussing fibremaxxing, gut health, and the importance of balanced fibre intake.

Disclaimer

This article is for general educational and informational purposes only. It is not intended to replace professional medical advice, diagnosis, or treatment. Individuals with digestive conditions, ongoing symptoms, or specific dietary concerns should consult a qualified healthcare professional before making major changes to their diet.