Well, as I once had it explained to me, fat cells trap/hold estrogen
. When you are losing weight...especially if it is rapid or done quickly, the estrogen
becomes freed up into the system. When estrogen is freed up into the system, it causes an "excess" of estrogen because when in perimenopause and especially, menopause, we have little progesterone by comparison to keep it thinned. So, this may be why your endometrium has become a LITTLE (it's very little) thickened.