Following diets is a pain! Just make a conscious effort to eat healthier and move a bit more! It doesn't have to be a regimented chore. I've dropped 4 dress sizes in the past 12 - 18 months (now 8, was 16)
I changed jobs from an office (sitting on my bum!) to a shop (mainly on my feet) and as my new job is more local to home, I don't have to rely on pre-packed sandwiches, pasties etc. for lunch. I make all of my food (no ready meals), and very rarely eat take away.
I still have curries, chillies, pasta etc. and have a roast dinner every sunday. I like a drink, have the occasional bag of crisps/nuts and never, ever, EVER go the the gym. It really can be as easy as making little changes to your routine - if I'd have known, I would have done it years ago!