a more persuasive theory imo is that yo-yo dieters that don't do serrious resistance training, have repeated cycles of sarcopenia and osteopenia -- i.e. lose 'g

a more persuasive theory imo is that yo-yo dieters that don't do serrious resistance training, have repeated cycles of sarcopenia and osteopenia -- i.e. lose 'good stuff' along with fat on the diet phase and gain back disproportionately fat after. The negative effects compound over time with each cycle.