Interesting conflict of interest (edit: potential conflict) with the researcher being the founder of a food supplement marketing company. http://en.wikipedia.org/wiki/Valter_Longo
Edit: I was wondering what the fasting + supplement connection was. Here we go:
"L-Nutra's first line of products stems from 15 years of research by Prof. Longo and his team at the USC Longevity Institute, one of the world's leading centers for research on aging and its translation into human interventions that optimize longevity and healthspan. It was largely motivated by the request of many patients who wanted to take advantage of the potential beneficial effects of fasting during cancer treatment but were unable to fast and forego any all meals or and snacks." (Emphasis mine)