The Fibre Gap: Why Most of Us Fall Short, and the Easy Ways to Close It

Fibre is the nutrient nobody puts on the front of a packet. Protein gets the shouty labels, calories get counted, sugar gets the traffic lights, and fibre sits quietly at the bottom of the nutrition panel being ignored. That would be fine, except that most of us are not getting nearly enough of it, and the shortfall does more harm than its low profile suggests.

The numbers are stark. UK guidance, set by the Scientific Advisory Committee on Nutrition, puts the target at 30g of fibre a day for adults. The average adult actually manages somewhere around 18 to 20g, roughly 60% of the target, and by the national survey's count only about one adult in eleven reaches 30g at all. So this is not a problem for a careless few. It is the normal British diet, falling about a third short of where it should be.

What fibre actually is, and why it matters more than it looks

Fibre is the part of plant foods your body cannot digest. Unlike sugar and most starch, it passes through the small intestine largely intact and arrives in the large intestine still whole, and that is exactly where the interesting work happens. Your gut bacteria use it as fuel, fermenting it and producing compounds that help look after the gut lining and a healthy microbiome. In a real sense it is less a nutrient for you than a nutrient for the trillions of bacteria working on your behalf.

The downstream effects are well evidenced, and worth stating in the careful way the science actually supports. When SACN reviewed the evidence, it found higher fibre intake associated with a significant reduction in the risk of cardiovascular disease, type 2 diabetes and bowel cancer, which is why "eat more fibre" turns up in essentially every national guideline. The British Heart Foundation also points to a link between higher fibre intake and lower blood pressure. None of this is a miracle-cure claim. It is the steady, well-replicated kind of benefit that actually counts.

The quiet engine under a lot of other things

Part of what makes fibre worth its own pillar is that it sits underneath several things people care about far more visibly.

It slows things down. Fibre blunts how fast sugar reaches your blood, which is why a piece of fruit, sugar wrapped in fibre, behaves so differently from a glass of juice, the same sugar with the fibre stripped out. That is the mechanism under a lot of "won't spike your blood sugar" advice.

It fills you up. Fibre-rich foods take longer to eat, take up more room and slow digestion, so they keep you satisfied for longer on fewer calories. When a snack genuinely "keeps you full", fibre is usually half the reason.

It feeds your gut. The microbiome is increasingly linked to everything from digestion to immunity, and fibre is its main food supply.

So a set of separate goals, steadier energy, feeling full, a happier gut, lower long-term risk, all quietly run through the same nutrient.

Why we fall short

The gap is not mysterious. It is mostly refined grains and not enough plants. White bread, white rice and white pasta have had their fibre-rich outer layers stripped away. Heavily processed foods tend to be low in fibre by design. And most of us simply do not eat enough fruit, veg, beans and wholegrains to make up the difference. Nothing dramatic, just a thousand small refined choices adding up to a third less fibre than we need.

The easy ways to close it

The good news is that closing a 10 to 12g gap does not need a diet overhaul, only a handful of changed defaults.

Swap refined for wholegrain. Wholemeal or seeded bread, wholewheat pasta, brown rice. This is the highest-yield change because it touches food you already eat every day, and the same logic runs through choosing a higher-fibre breakfast cereal.

Lean on beans and pulses. Tinned chickpeas, lentils, kidney beans, baked beans. Cheap, filling, and among the most fibre-dense foods there are. A tin stirred into a stew, curry or salad does a lot of work.

Keep the skins on. Much of the fibre in fruit and veg lives in or just under the skin, so leave the potato, apple and carrot skins on where you reasonably can.

Add nuts and seeds. A small handful on porridge or yoghurt, or as a snack, brings fibre along with protein and healthy fats.

Make veg the bulk, not the garnish. The most reliable move of all is simply more vegetables on the plate, which is also why a ready meal that is light on veg is one to upgrade.

None of these is heroic. Done together, they close the gap comfortably.

Two sensible cautions

Build it up gradually, and drink water. Adding a lot of fibre overnight can leave you bloated and uncomfortable. Increase it over a couple of weeks and keep your fluids up, and your gut adjusts.

And adapt to your own tolerance. For some people, particularly with IBS, larger amounts of fermentable fibre can trigger bloating, wind or discomfort, and the right amount and type is individual. If that is you, this is a conversation for your GP or a registered dietitian rather than a blanket "eat more fibre". Children also need less than adults, scaling up roughly from 15g at age two to 25g by secondary school, so the 30g figure is an adult target.

Where MyFoodFit fits

Fibre is easy to ignore precisely because it is not on the front of the pack. It sits in the small print while sugar and calories take the headlines, so the higher-fibre version of a product rarely announces itself. Scanning brings it back into view. The app reads the fibre along with everything else and scores the product against your profile, so when you are choosing between two loaves, two cereals or two ready meals, the more fibre-rich option is not left to guesswork. Closing the gap is mostly a matter of picking the better version of each everyday choice, which is exactly the decision the app is built to make easy.

Fibre is the least glamorous thing in the nutrition panel and one of the most worth paying attention to. The target is 30g, most of us are a third short, and the fix is a few swapped defaults rather than a new diet. Change the bread, add the beans, keep the skins on, and let the rest follow.