Fibre is an important component of natural plant foods and plays a major role in digestion, gut health and the intestinal microbiome.
Unlike digestible carbohydrates, fibre is not fully broken down by the human digestive system. Different types of fibre interact with water, the intestinal tract and gut microorganisms in different ways.
Fibre and the Gut Microbiome.
One of the most important functions of fibre is its interaction with the gut microbiome. Certain fibres are fermented by intestinal bacteria, producing short-chain fatty acids and other compounds that can support the intestinal environment, metabolic function and immune regulation. The diversity of fibre matters. Different plants provide different types of fibre and different compounds that can nourish different groups of beneficial microorganisms.
Natural Fibre vs. Refined Fibre.
Not all fibre-containing products are equal. Whole foods such as vegetables, berries, fruits, legumes, nuts and seeds provide fibre together with naturally occurring polyphenols, minerals and other plant compounds. Highly refined or isolated fibres can behave differently from the fibre contained within whole foods. For this reason, the foundation of fibre intake should be *whole and minimally processed foods*, rather than relying heavily on refined fibre additives.
Sources of Fibre.
Good natural sources include: – vegetables – berries and selected fruits – legumes – nuts – seeds – chia seeds – flaxseeds – avocados – other minimally processed plant foods A varied selection of plant foods provides a broader range of fibres and plant compounds for the microbiome.
Fibre and Digestion.
Adequate fibre can support normal bowel function and regularity. However, increasing fibre very rapidly can cause bloating, gas or abdominal discomfort, particularly when the digestive system is not accustomed to a higher intake. The appropriate amount and type of fibre can therefore vary between individuals.
The Bottom Line.
Fibre should primarily come from *real, minimally processed foods* rather than isolated and highly refined products. The goal is not simply to consume as much fibre as possible. The goal is to provide the gut with a *diverse range of natural fibres and plant compounds* that support a healthy and adaptable microbiome. *Feed the microbiome with real food, not just isolated fibre.*