In reply to Dominicandave: I had replied to the correct thread, and as I said, I'd talk to my partner, openly and honestly and get to the bottom of why she's eating(?!?), instead of being a douche bag and posting online.
That's it, it may be simple, she may just enjoy eating crisps at 7am, it may be more complex and some of what's said may be upsetting for her or for me, but as some one who's invested in my partners happiness I would do anything to help. Well, I say anything, I wouldn't put conditions on my assistance, I wouldn't put money before her happiness, I wouldn't ignore the root of the problem and focus on the weight gain.