Tamoxifen and weight gain

Thanks for the suggestions I have started a food diary,that was a good idea as it really shows what your eating,tried to cut out snacks,I think before taking tamoxifen I didn't really have to try to maintain my weight,just exercising and now I am going to have to watch how I eat as I can't eat like before,my meals are healthy but I think my portions size are to much.thanks ladies