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1.
When you've been unusually eating a whole lot of food; putting down a lot of food during one meal sitting.

Micheal Phelps stated that during his training for the Olympics he was taking on 12,000 calories per day.
Person 1: Dang you just put down two whole meals.?!"

Person 2: "Yeah I've been on the Michael Phelps diet lately."
by secondsaway84 February 22, 2009
 
2.
see munchies
I'm so high I'm about to go on the Michael Phelps' diet
by phelpsfan March 01, 2009