I remember once reading an article about cheat ways to diet. One suggestion was to turn the central heating down a few degress so that the body would have to work harder to keep warm and so burn more calories.
I can confirm it works. Due to a "catastrophic" leak in our plumbing I've had no central heating for ten days. Yes, it's cold but the bonus is I seem to have lost three kilos without trying - depsite eating an excess of bourbons to cheer myself up!
Have a go, save some money, burn the calories. I've heard there's an even colder spell coming next week so I'm looking forward to a few more bourbons and a few less kilos.