Vegetarians don't eat any food products made from meat, fish, shellfish, crustacea (such as prawns or crab) or animal by-products (such as gelatine or rennet). Vegans don't eat any food products that come from animals, including dairy products and eggs.

While “it is not surprising” that vegans may live longer, “as following a vegan diet is linked to reduced occurrence of chronic disease… more research is needed to definitively conclude that vegans live longer than non-vegans”, she said.

Unfortunately, due to the highly restrictive nature of the diet, vegans are at risk of being deficient in certain nutrients such as calcium and vitamin B12 usually found in dairy and meat respectively.

Many people still believe that a vegan diet is deficient in essential nutrients, or that it is not sustainable for long-term health. Additionally, vegans may face negative stereotypes, such as being viewed as “preachy” or “judgmental.”