I'm right there with you.
I'm not sure how old you are but it seems like as soon as I turned 50 my metabolism went on vacation.
I also had a hysterectomy several years ago so that might be part of the problem.
I really try to watch what I eat but I think it's the sedentary lifestyle that I now have that is the problem. I can't exercise like I used to. Can't walk on a treadmill. I used to walk for 1 1/2 hours on the treadmill three times a week and that really helped. I miss it.
I never envisioned myself as a chubby Grandma at 55 but that's what I am! I love being a Grandma.......NOT being chubby!