Your brain takes up approximately 20% of your energy. Its also the part of your body that is crucial to maintain homeostasis for. A great way to burn extra kilojoules without exersising is to think very hard on a difficult problem. Mulling over a difficult problem while exersising would of course increase weightloss. It will relieve the boredom of exersising if it isnt "your thing" as well as relieve the stress hormones produced from focussing on the difficult problem (esp. if it relates to you personally).
If you are interested in weightloss, putting a mirror on your fridge or pantry at head height might make you have to look yourself in the eye every time you wish to indulge. Moderation in all things is the age old advice.