To test this, Energy Metabolism Professor Michael Ristow fed roundworms a dose of niacin, discovering that they lived one-tenth longer than those who went without.

The vitamin is also rich in the likes of Marmite, paprika, peanuts and sun-dried tomatoes.

This is surprisingly contrary to what scientiests believed, because the standard assumption has been that niacin promotes the formation of "free radicals," causing faster ageing.

An antioxidant-rich diet has been contradicted by Professor Ristow's findings, which shows that niacin "tricks the body into believing that it is exercising," perfect for any particularly lazy individual.