The new diet of Facebook CEO Mark Zuckerberg is not for the faint of heart: He only eats what he kills.

"This year I've basically become a vegetarian since the only meat I'm eating is from animals I've killed myself," Zuckerberg wrote in an email to Fortune.

The diet is one of Zuckerberg's many "personal challenges," he claims, that help him expand his interests and teach himself discipline. Last year, he tried to learn Chinese, and now he's trying to be more responsible about the food he eats.

"A bunch of people told me that even though they loved eating pork, they really didn't want to think about the fact that the pig used to be alive. That just seemed irresponsible to me. I don't have an issue with anything people choose to eat, but I do think they should take responsibility and be thankful for what they eat rather than trying to ignore where it came from," Zuckerberg says.

Zuckerberg's view on nutrition ethics are similar to some types of Buddhist vegetarianism and Locavorism. And as he himself admitted, it's "basically" a vegetarian diet.

However, the fact that Zuckerberg did kill some animals himself — according to Fortune, this includes a lobster, chicken, pig and a goat — to eat them will surely stir some controversy. Zuckerberg even posted a message on his private Facebook page on May 4 saying, "I just killed a pig and a goat."

What do you think about Zuckerberg's view on meat-eating? Could you ever embark on such a diet? What's more acceptable: having others kill the animals for your food, or doing it yourself? Please, share your opinions in the comments.