1 Before 1997 it was called reverse anorexia nervosa, because researchers didn’t understand it well. Subsequently, Pope et al. (1997) described additional cases and proposed to rename the syndrome “muscle dysmorphia.”
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1627897/
2 https://www.sciencedirect.com/science/article/abs/pii/S1740144512000125