The sites tend to gloss over bad news: people with anorexia are 56 times more likely than their peers to commit suicide. (And they’re not broadcasting the November anorexia-related death of Brazilian model Ana Carolina Reston.)

Sites deny being harmful, saying they provide a community for those with eating disorders. The term “pro-ana” is broadly used, and sites vary greatly. “We offer them support, saying, ‘It will be. Continue going to your doctor’,” says five-foot, 89-pound proana.us owner Anna Robbins.

In November, the Academy for Eating Disorders suggested a mandatory warning statement: “Warning: anorexia nervosa is a potentially deadly illness. The site you are about to enter provides material that may be detrimental to your health.”