Professor Mark Mattson

Professor Mark Mattson is of the specialists Michael Mosley visited whilst in the U.S making the Horizon fasting program.   He's annoyingly fit, healthy, and very enthusiastic about Intermittent Fasting which he practices all the while.   Here's a little bit about him culled from Wikipedia

"Mark Mattson, laboratory chief of neurosciences at the National Institute on Aging has done research on IF and says "Our genes, our genetics, are geared to us having food intermittently. ... I’m comfortable with saying that it’s healthy, it’s fine, to skip meals. The animal studies are very clear. ... I think it’s better to eat one meal a day than six small meals. You need to challenge your system. ... It’s OK not to eat three meals a day. It’s OK a couple days a week to eat just one meal. It’s actually not only OK, it’s healthy." Mattson practices IF himself, skipping breakfast and lunch during the week, and rarely exceeding 2000 kcals/day. He's 130 pounds at five foot nine inches. He says he gets most of his calories from whole grains, nuts, fish, and yogurt."