I ballooned to 17st 4lb and i went on holiday in Jan and looked like a beached whale in my bathers, was a 2XL !!!! That did it for me and since then i've changed my lifestyle and eating habits.Do some walking and the gym.
I still have a few beers on the w/e and the odd treat, meal out but eat healthy in the week. A takeaway is now a treat rather than the norm.
I'm realistic with what i want to lose as i know i'm never going to get to a medium and sustain it. I'll be happy to be a size L and my target is 13st 12lb. I'm currently 14st 6lb and feel a whole lot better for it.
I've done myself a google spreadsheet and weigh myself every Friday morning. If i've had a busy w/e friends round, beers, eating out and put a couple of pounds on i'm not too bothered as i'll lose it the next week. It can't be all diet, i have to have some treats but as many have already said it's about being sensible.
PS: It's cost me a fortune in new clobber, but it's well worth it.