Tamoxifen and weight gain

I was on the Sandoz too, I think they all have the side effect of weight, I have just found in my 40's as you say, everything changes, I cant eat the way I used to and I didnt need to manage my weight at all. Now whoa!!! its ridiculous, so I too am really being conscious with snacks but not alot has made any difference, very frustrating. All the best, try alot of different things, change up maybe your exercise? I ride an exercise bike and have now started doing 30sec bursts really fast every 2 mins. I walk too but cannot manage major exercise anymore, I have fibromyalgia and treatment exacerbated it big time so exercise unfortunately doesnt make it better, bit of a vicious circle lol, but I keep on trying anyway. x M