Fibre

Dietary fibre refers to the diverse group of plant-derived carbohydrates that the human body cannot fully digest or absorb. Found exclusively in plant foods like legumes, whole grains, vegetables, and fruits, it passes relatively intact through the stomach and small intestine. While it provides negligible calories, it serves as a critical structural component of plant cell walls and acts as a primary fuel source for the beneficial bacteria residing in the human gut microbiome.

In the digestive tract, fibre functions through two primary mechanisms: solubility and fermentation. Soluble fibre dissolves in water to form a viscous gel, which slows the absorption of glucose and binds to bile acids to help manage cholesterol levels. Insoluble fibre adds physical bulk to the stool and stimulates peristalsis, accelerating the passage of food through the colon. Meanwhile, gut microbes ferment certain fibres into short-chain fatty acids, which nourish the colon lining and regulate systemic inflammation.

For the modern consumer, increasing fibre intake is one of the most effective ways to improve metabolic health and satiety. However, the 'fibre gap' remains a significant public health issue, as most people consuming highly processed diets fall far short of recommended daily targets. While supplements exist, they rarely replicate the complex matrix of phytonutrients found in whole plants. Rapidly increasing intake can cause temporary bloating, so it is best to transition gradually while maintaining consistent hydration.