Eat little, reducing by 20-40% the calories introduced with the diet in a narrow time window. This, according to the experts of the Italian Society of Internal Medicine (Simi), is the true elixir of life.

Calorie restriction activates a sort of 'internal cleaning' (like the one that is periodically done on the computer's hard drive) which, in addition to removing deteriorated and potentially dangerous components, also stimulates cell regeneration. "It should be emphasized, however," warns Professor Giorgio Sesti, "that changing one's diet and body weight can also have opposite effects"