I'm in the same position as you - weight was normal and manageable up until my 40s and then I started gaining rapidly.

(I have been on one diet or other since then & I am still hovering around 13stone)

If I think too hard about it, I can feel suicidal. I don't understand what has happened to my body and it is only now, from finding this website and reading the theories on weight gain, that I can see a glimmer of hope.

I've been low carbing for about 3 weeks and dropped 2lb - but, switched to increasing fats last week which seems to have helped.