When women become morbidly obese, their  bodies  semi ambulatory carcasses start shutting down production of progesterone and testosterone, leaving only estrogen. This causes depression, sleep disturbances/insomnia, anorgasmia, and ....thinning hair. You might think a woman with "estrogen overload syndrome" would have thick luxuriant hair, but no ; it causes thinning hair or even balding.