Humans have sought the fountain of youth and long life for millennia. For longevity at least, scientists think they’ve found a potent intervention: proper nutrition, which in contrast to our genetic makeup and certain living conditions is alterable. And it appears that not only what and how much we eat is important, but also when. In an article published in the US-based journal Cell, gerontologists Valter Longo and Rozalyn Anderson examine hundreds of ageing and nutrition studies on simple organisms, laboratory animals and humans, combine them with their own studies and come up with a “longevi…