Since we're all primates, why not live on the same diet as the monkeys in the zoo? That's what this chap is doing, but he isn't munching bananas. He's eating ZuPreem primate dry animal food, presumably the monkey version of cat biscuits. You can read his weight stats, see videos, and track progress on his blog - which is truly funny.
I am not tempted to emulate him. Not at all. Never.