This guy didn't exist on just air and sunshine, he does have "just four coffees and two fruit juices every day for six-and-a-half years, plus that occasional glass of wine" and "Now and again I get an appetite - when I might eat a couple of grapes or a nut. But these days I can take it or leave it."
Still, it's amazing.
I wonder how much sun he gets and how much of his body is exposed.