Fibre is the nutrient almost everyone under-eats, and it is the one plant-based diets deliver in abundance. Vegans eat the most of anyone, and the payoff shows up across the body.
Vegan Brief·Evidence last reviewed July 16, 2026
This is a summary of the cited evidence, not medical advice.
Fibre intakeHighest in vegans
Linked toLower cholesterol, diabetes risk
Also feedsThe gut microbiome
01
Vegans eat the most fibre
Fibre only comes from plants, so a diet built entirely on them tends to be rich in it. In the EPIC-Oxford study, the vegans stood out.
Primary source 01 / 02
those who consumed a vegan diet ate the most fiber, the least total fat and saturated fat, and had the healthiest body weights and cholesterol levels compared with omnivores and other vegetarians
That single sentence bundles several of fibre's benefits together: the highest-fibre eaters also had the healthiest weights and cholesterol. Fibre is not the only reason, but it is a through-line.
02
What the fibre does
The clearest disease link is metabolic. High-fibre plant eating is tied to a lower risk of type 2 diabetes and is used as a tool to manage it.
Primary source 02 / 02
Vegetarian and vegan dietary patterns characterized by nutrient-dense, high-fiber plant foods lower the risk of type 2 diabetes and serve as effective therapeutic tools in the management of type 2 diabetes.
Beyond the blood sugar and cholesterol effects, fibre is what feeds the community of bacteria in the gut, which ferment it into compounds the colon uses. A varied plant diet, rich in legumes, whole grains, vegetables and fruit, is about the most reliable way to eat well for that microbiome. The practical caveat is comfort: if you switch to a high-fibre diet quickly, ramp up gradually and drink water while your gut adjusts.
Plant-based diets and type 2 diabetesVegetarians and vegans get type 2 diabetes far less often, and a vegan diet helps manage it, though the trial effect on blood sugar is real and modest, not a cure.
Plant-based diets and weightAcross tens of thousands of people, the pattern is consistent: the more plant-based the diet, the lower the average body weight.
Plant-based diets, gout and kidney stonesFor gout and kidney stones, cutting meat is one of the cleaner wins in nutrition. Vegetarians formed about a third fewer stones, and plant purines never earned their bad reputation.
Is Carrageenan (E407) vegan?Is it vegan? · Carrageenan is a thickener pulled from red seaweed. It has its critics on other grounds, but the vegan question is not one of them.
Is Inulin vegan?Is it vegan? · Inulin is a prebiotic fibre pulled mostly from chicory root. It is plant storage carbohydrate, plain and simple.
What happens when you go vegan, week by weekGuides · A physiological timeline of what actually changes when you stop eating animal products, organised by mechanism rather than by promise.
Frequently asked
Do vegans get enough fibre?
Typically more than enough. Vegan diets are the highest-fibre pattern in the cohort studies, since fibre comes only from plants. Most people, vegan or not, benefit from the amount a whole-food plant diet provides.
Is a vegan diet good for gut health?
The high fibre in a varied plant diet feeds beneficial gut bacteria and is linked to lower cholesterol and diabetes risk. Increase fibre gradually and drink plenty of water to avoid short-term bloating.
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Stanford microbiologists Justin and Erica Sonnenburg describe how dietary fiber shapes the bacteria in the gut. The book applies to any diet and leans on plant foods.
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