Is it true that … you can never eat too much fibre?

Fibremaxxing is everywhere, and most of us should eat more roughage, but your gut won’t thank you for overloading

Fibre has replaced protein as TikTok health influencers’ macronutrient du jour, with “fibremaxxers” urging followers to pack as much roughage into their diets as possible. But is the sky really the limit?

“In theory,” says Dr Emily Leeming, a dietitian at King’s College London and the author of Fibre Power (out in May): our ancestors may have eaten up to 100g of fibre a day, but that’s far beyond what most modern guts can tolerate.