Fibre: The Underrated Nutrient That Affects Nearly Everything

Fibre: The Underrated Nutrient That Affects Nearly Everything

2026-05-24 · 7 min read

Dietary fibre is the portion of plant food that your digestive enzymes can't break down. This sounds like a limitation, but it's actually what makes fibre so valuable — it does its best work precisely because it isn't digested in the usual way.

Why Fibre Matters So Much

  • Slows glucose absorption — reducing blood sugar spikes and improving insulin sensitivity
  • Feeds gut microbiome — fermentable fibres are the primary food source for beneficial gut bacteria
  • Supports heart health — soluble fibre binds to LDL cholesterol and removes it
  • Reduces colorectal cancer risk — one of the most robust diet-cancer links in the literature
  • Improves satiety — fibre-rich meals are more filling per calorie
  • Supports regular digestion and bowel health

Two Types of Fibre

Soluble fibre (oats, beans, lentils, apples, psyllium) dissolves in water to form a gel, slowing digestion and helping regulate blood sugar and cholesterol. Insoluble fibre (wholegrains, vegetables, nuts, seeds) doesn't dissolve, adding bulk to stool and supporting regular bowel movement. You need both.

How Much Do You Need

Current guidelines suggest 25g per day for women and 38g for men. Average Western intake is 15–17g. The gap is significant, and closing it has measurable health effects. More than 70% of the population falls short of the recommended amount.

Practical Ways to Increase Fibre

  • Switch to wholegrain versions of bread, pasta and rice
  • Leave the skin on vegetables and fruits where possible
  • Add beans or lentils to any meal they can plausibly belong in
  • Snack on fruit, nuts and seeds instead of processed options
  • Add a tablespoon of chia or ground flaxseed to yogurt, oats or smoothies
  • Eat vegetables with at least two meals per day
Increase fibre intake gradually — adding too much too quickly causes gas and bloating as your gut bacteria adjust. Add 5g per week and drink more water alongside it. Within a month, your gut adapts and the digestive discomfort largely resolves.

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