Fibremaxxing is the wellness trend taking over your feed - and for once, it's guidance that really could be good for you. Here's everything you need to know.
What is fibremaxxing?
TThe idea is simple: pile as much fibre into your daily diet as possible to keep you full for longer, supercharge your gut and slash your risk of colon cancer, cardiovascular disease and diabetes. In short, a high fibre diet can literally boost your life expectancy.
Expert guidance suggests building fibre into meals throughout the day - fibremaxxing - by topping up with seeds, keeping the skin on potatoes or apples and adding chickpeas or beans to curries and pasta. Small changes that can help you double or even triple your daily fibre consumption.
Can a high fibre diet reduce inflammation?
Fibre is known for keeping us 'regular', but its health benefits go way beyond avoiding constipation. LYMA's Director of Science, Professor Paul Clayton, said:
"There is a reason the gut is sometimes called the body's second brain. It processes nutrients, trains the immune system, influences mood, regulates inflammation, and, perhaps most critically, determines whether the rest of your biology operates the way it should. When gut health is good, you may not notice it at all. When it is not, everything else tends to shift.
"The good news is that the gut is responsive. Unlike genetics or ageing, it is a system that can be meaningfully improved through the right daily inputs. And the starting point, the single most powerful lever you have, is one that most people underestimate entirely: fibre."
We're not eating enough fibre.
Most adults around the globe fall short of the recommended daily intake of fibre, yet doing so would have a profound impact on public health.
Ten years ago, the UK government increased fibre recommendations from 24g to 30g per day. It has made little difference. According to the latest research from the British Nutrition Foundation, just 4% to 9% of UK adults eat enough fibre.
Research has found that widespread adoption of healthier eating patterns could save the NHS roughly £6.7 billion per year. In the US, an estimated 95% of American adults and children fail to meet their daily fibre needs. According to the US National Institutes of Health, increasing daily fibre intake by just 9 grams could save an estimated $12.7 billion in annual healthcare costs related to constipation alone.
In 2015, the Scientific Advisory Committee on Nutrition found that every 7g daily increase in fibre, equivalent to half a tin of baked beans, could lower your risk of heart disease and cancer by up to 9%. And a 20-year study published in Nutritional Neuroscience in 2022 found that higher fibre intake is associated with a lower risk of developing dementia, possibly because a healthy gut microbiome may reduce brain inflammation.
Fibremaxxing and gut health: why your microbiome depends on fibre
The gut microbiome is directly supported by dietary fibre. Without it, gut bacteria shift in balance and begin breaking down other nutrients instead, including protein. When bacteria break down protein and amino acids, the by-products are not beneficial for health and can increase the risk of heart disease and colon cancer.
A healthy gut microbiome has a wide impact on inflammation and immune function, and there are clear links between gut health and the brain - influencing mood, appetite and cognitive function. Fibremaxxing, done consistently, is one of the most effective ways to support it.
Why 15g of diverse prebiotic fibre is key
The dietary target that research increasingly supports, and that Professor Clayton has long championed - is 15 grams of diverse prebiotic fibre daily. Not total fibre; prebiotic fibre specifically. The kind that actively feeds beneficial gut bacteria, rather than simply passing through.
Professor Clayton said: “The modern gut crisis is fundamentally a fibre crisis. We have stripped from our diets the very substrate that gut bacteria evolved to eat over hundreds of thousands of years."
The richest dietary sources of prebiotic fibre:
-
Chicory root
-
Jerusalem artichokes
-
Garlic, leeks and onions
-
Asparagus
-
Green bananas
-
Oats and flaxseed
-
Legumes
“Variety matters as much as quantity, different fibre types feed different bacterial strains,” said Professor Clayton.
Soluble vs insoluble fibre: what's the difference?
Not all fibre works the same way. There are two main types, and a high fibre diet benefits from both.
Insoluble fibreis found in wholegrains, vegetables and fruit skin. It keeps things moving through the gut, helps remove waste products from the body and limits the bowel lining's exposure to potentially cancer-causing chemicals - making it a key ally in colon cancer prevention.
Soluble fibreis found in oats, beans and many fruits. It absorbs water to form a gel in the gut, which slows digestion and helps keep you full. It also slows how quickly glucose is absorbed into the bloodstream, reducing the risk of type 2 diabetes, and lowers cholesterol by binding to it and removing it as waste, reducing the risk of heart disease in the process.
Some soluble fibres also act as prebiotics, feeding beneficial gut bacteria. High fibre prebiotic foods include chicory root, onions, garlic, oats, barley, apples and seaweed.
Fibremaxxing smarter: why fibre length matters
Not all fibre behaves the same way - and chain length is why.
Short-chain fibres, such as inulin and FOS, ferment rapidly in the upper colon. They fuel a quick burst of bacterial activity but are exhausted before reaching the distal colon, the section of the colon research suggests may be most critical for long-term disease prevention.
Long-chain fibres are more structurally resistant. They travel further before fermenting, reaching the lower colon where bacterial populations are densest and fermentation products have the greatest impact on systemic health - producing a more complete, whole-colon effect.
A strategy that combines short, medium and long-chain prebiotic fibres equates to fibremaxxing done properly: not just more fibre, but smarter fibre precisely matched to the full length of the gut.
How to start fibremaxxing: simple high fibre food swaps
You don't need to overhaul your diet overnight. Here are easy ways to increase your daily fibre intake:
-
Swap white bread and pasta for wholegrain versions
-
Add chia seeds or flaxseeds to smoothies, yoghurt or porridge
-
Keep the skin on potatoes, apples and pears
-
Add a tin of chickpeas or lentils to curries, soups and pasta
-
Snack on nuts, carrots or hummus instead of processed foods
-
Choose oats for breakfast
Increase your intake gradually and drink plenty of water, this helps fibre do its job and avoids digestive discomfort.
Conclusion
Fibremaxxing isn't a fad: the science is unequivocal. More fibre means a healthier gut, a stronger immune system and a significantly lower risk of serious disease. The statistics reveal that the gap between what we eat and what we should eat is vast, however, the fix is simple. Small, consistent additions to your daily diet that add up to a profound difference. The power of fibremaxxing.
