The Matthew Morrison Weight Loss Secret: Potatoes

Glee star Matthew Morrison sure knows how to strike a lean, mean shirtless pose, as his Details photo spread in December proved beyond any doubt.

His secret to keeping that body? That part of it may surprise you.

For three days before the Details shoot, the actor ate nothing but ... sweet potatoes. He scientifically explains this dietary strategy as such: “The potato acts as a sponge and your body literally shrinks and gets ripped and tight."

Mmmyeah, not sure about that, Matt. Then again, it worked, so ...