I agree with whomever said that fat stores hormones. Fat and estrogen are best buddies !! It would make sense that as your fat resources are depeleted, your horormones will do funky things to your cycles.

When we were doing fertility treatments, I gained 17 lbs just from the horomones alone . I was taking Clomid, Pergonal, Estrogen, HcG, and Progesterone. Not only did the horomones make me hugely bloated, it took three months for my cycle to get back to anything remotely normal.