Ke$ha — Blames Dr. Luke for Eating Disorder — He Called Me Fat

EXCLUSIVE

Ke$ ha is telling friends her eating disorder was caused by her very own composition producer Dr. Luke  — claiming he bashed her weight and even called her a huge, stout refrigerator … TMZ has learned.

Sources directly connected to Ke$ ha tell us  … it all started when the singer’s “Get Grubby” tour finished in 2011.  She says Luke — who signed…