Do you want to lose weight at no cost, and save money at the same time? Then turn your thermostat down. Research has shown that if you are prepared to be a bit cold then your body will burn off calories faster to maintain your body temperature. You will also save on your heating bills. Is this practical though? If we burn energy faster then we tend to compensate by eating more. Conclusion: the only way to lose weight is to eat less and be more active.