Dietary fibre is an important component of a healthy diet and is known for its significant benefits to gastrointestinal health. This article explores the various types of dietary fibre, their mechanisms of action, and their impact on gut health. Dietary fibre is broadly classified into two categories: soluble and insoluble fibre. Understanding the different types of dietary fibre and their specific benefits can help you make informed dietary choices.

Soluble fibre dissolves in water to form a gel-like substance. It is found in foods like oats, beans, apples, and citrus fruits (e.g. oranges and tangerines). Soluble fibre is known for its ability to lower blood cholesterol and glucose levels. Insoluble fibre on the other hand does not dissolve in water and helps add bulk to the stool, promoting regular bowel movements. It is found in whole grains (unpolished maize, whole wheat, brown rice etc), legumes (beans of all colours and pulses) nuts, potatoes, yam and vegetables like cauliflower, cabbage, green leafy vegetables etc.

The beneficial effect of dietary fibre on gut health happens through several mechanisms. In one such mechanism, soluble fibres are fermented by gut bacteria to produce beneficial short-chain fatty acids which serve as an energy source for colon cells and also have anti-inflammatory properties. In another mechanism, insoluble fibre adds bulk to the stool, which helps to maintain regular bowel movements and prevent constipation. Further, certain fibres (eg fibres from onions, garlic, bananas, etc) act as prebiotics, (substances that stimulate the growth of beneficial gut bacteria) and play important roles in maintaining a healthy gut microbiome balance.

Recent studies have highlighted the importance of dietary fibre in managing and preventing various gastrointestinal disorders. The recommended daily intake of dietary fibre is 25 grams for women and 38 grams for men. However, most people consume less than the recommended amount, predisposing many in the population to gastrointestinal disorders. Incorporating a variety of fibre-rich foods into your diet can help meet the daily fibre recommendation and significantly improve gut health and overall well-being.

Are you eating enough fibre in your meals?

A dietitian can help you plan your meals and snacks around high-fibre foods and tailor your diet to suit your health needs.

Written by Laurene Boateng (PhD, RD) Consulting a registered dietitian empowers you to take control of your health and make informed dietary choices that support your well-being. Click here to join Full Proof Nutrition WhatsApp channel to receive more educative content