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The answer to that question is easy. During his convalescence from his injury, he's still eating the same amount of calories or perhaps more than his pre-injury shape. Lots of athletes do this, diet is the hardest part of the game. Only the very dedicated few can stay in shape all year round, whether they're healthy or not.
Six million this year and a player option for six million next year. That's a lot of donuts and pizza.