@AllTangledUpInThisTango Thanks :)
In all honesty, I don't know about weight gain! I can only say how I find it.
I've been on HRT for ages (almost 15 years.)
My weight hasn't changed (still low end of normal BMI) but I know I've lost some muscle.
I can't get away with over-indulging and it takes a lot longer to shift a couple of pounds compared to how it was in my 30s or 40s. I think that's partly because I'm just not moving as much (desk based work now) although I do exercise daily.
I can only think that the weight gain is a combo of lots of things.
maybe less activity ( we aren't chasing toddlers around all day), erratic periods might mean some women crave carbs as part of ongoing PMS, may exercise less if they feel tired/ lose sleep (poor sleep changes metabolism and can really upset how the body processes food.) And, older people do usually just need less food.
I also think the type of HRT may be a factor. I 'feel fat' on the progesterone part of it (possibly some fluid retention) and maybe if women are on combined HRT (both hormones every day) that could be part of it. Under guidance from a consultant I'm still using a sequential regime, and it's a variation on the 4-week one.
There was some research out a few months back on the 'myth' that metabolism changes (for men and women) over 50. They said it doesn't but after 60, we all need less food as our metabolism does slow down a bit then.
HRT is shown to help improve lipid levels and there is evidence it can help prevent diabetes.
Anyway- don't want to go on about 'me' but maybe this answers some of your questions.