For how we live.
Loading up on dietary fibre is the rare viral trend with strong data behind it: high-fibre eaters have markedly lower mortality. But the evidence is for whole foods, not powders, and tracks a habit, not a one-day stunt.
Pooling 58 randomised trials, about 3.5g a day of oat beta-glucan lowered LDL cholesterol by 0.19 mmol/L. A separate meta-analysis of 28 trials found 0.25 mmol/L. Small per person, but consistent.
A banana is mostly sugar and starch, but it comes with fibre and potassium, and large cohort studies link whole fruit — bananas included — to slightly lower type 2 diabetes risk, not higher.
Two meta-analyses of dozens of randomised trials agree that about 3 grams a day of oat beta-glucan lowers LDL cholesterol by a small, real amount. The effect is genuine, modest, and dose-dependent.
Air-popped popcorn is a whole grain, high in fibre and low in fat — a legitimately good snack. What turns it unhealthy is butter, oil, salt and portion size, not the corn itself.
Six months of dietitian sessions aimed at a high-fibre diet nudged diet quality but left estimated 10-year cardiovascular risk, HbA1c, cholesterol and blood pressure essentially unchanged versus standard care.
Higher whole-grain intake is consistently linked to lower rates of heart disease, cancer and early death, with benefit rising up to about seven servings a day. Refined grains show no such signal.
A randomised trial found the Portfolio diet cut LDL cholesterol by about 13%, and a large cohort study links closer adherence to lower cardiovascular risk. Its authors' industry funding belongs in the record.
The trend treats the gut as a dashboard to be tuned with home tests, probiotics and 'gut-healing' protocols. The one intervention with the broadest evidence is the least sold: fibre.
A meta-analysis of 30 randomised trials found fibre supplements work in IBS, with the benefit concentrated in psyllium. Wheat bran was the most-studied type and did not carry the effect.
A Lancet series covering 135 million person-years found the largest risk reductions in that range. Trials of isolated fibre supplements produce much smaller effects on much narrower outcomes.