There are a bewildering array of diets: GI, Atkins, Paleo, Ketogenic, Dukan, Scandinavian LCHF, Banting, Bulletproof, South Beach. It goes on and on.
All of these have there strong advocates and so it’s hard to decide which one to opt for. Thankfully, the work of Professor Valter Longo,an expert on ageing, cuts through these all to find the best diet to live long and healthy. I summarise the main findings of his "longevity" diet, which include suggestions like eating mainly vegan to time restricted eating.