Zuckerberg, 27, gives himself a different personal challenge every year, like wearing a tie every day and learning Chinese.
This year, he says he wanted to be more aware of what it really takes to put food on the table.
Zuckerberg is working with a chef who lives in his neighborhood. So far, his challenge has included lobster, chicken, pig and goat. The new diet is Zuckerberg's way of saying thanks to the animals that sacrifice their lives so he can eat.