How social media like Facebook and Instagram "cause anorexia"

But seeing an endless array of your peers’ successes—whether it’s how thin they look in a bikini on the beaches of Cannes or how happy they look with their family at Christmas around the perfect holiday dinner—may encourage the pejorative self-comparisons that are “the most salient factor” in developing eating disorders, said Adrienne Ressler, the Vice President of Professional Development for The Renfrew Center Foundation.

Negative self-image, and specifically negative self-talk, has been connected with eating disorder severity.

A 2014 study published in the Journal of Eating Disorders found that greater average frequency of negative self-talk “predicted greater frequency of purging, greater attempts to restrict eating… and increases in overall ED [eating disorder] severity.”