Zooey Deschanel

The 44-year-old actress is allergic to eggs, wheat and dairy, which inspired her to try veganism.

She told Vulture magazine in 2011: "I am the worst person to ever eat with because I have all these stupid food allergies. To be a gluten-free vegan is, like, the most difficult thing you can possibly be. And I lasted, like, six months. At a certain point, you just have to go, 'You know, this gets in the way of my living too much.' I think I was at a sushi restaurant and..."