It makes sense. The body is seeking homeostasis, “wanting” the muscle back, so it uses its only tools: hunger triggering mechanisms/hormones.
We’ve seen the same thing happen with certain nutritional deficiencies: the body is lacking a vitamin, a mineral, protein (The Protein Leverage Hypothesis) or omega-3s, so it shoots off the hunger signals or the “I’m not full” signals. Problem is, there’s not much info in that “feed me” message, so people just eat more of the same junk and don’t fill the deficiency holes. Also related: Toxic Hunger.