Yeah I heard about the breatharians. They're rather manic hypocrites in my humble opinion.
As for the vegans... I could go off about them for ages. They want to stop using honey and end enslavement of bees - and then use agave and starve bats.
They also claim that ending meat will save the environment, but neglect to think about the transit costs on the environment for all their food coming in from all over the world.
I'll leave it there.