A type of website that promotes anorexia
A pro ana website is a website, that has pictures of anorexic girls, tips to anorexia and bulimia, etc.
Someone who thinks anorexia is a lifestyle and gets help from a web community to achieve his/her goals. Used to describe the internet anorexia movement.
Person: Oh, anna looks so nice and skinny lately, what is her secret?
Friend: It's the new pro ana diet! Try to google it.