[mickduprez]

You're correct in that carbon dioxide exhaled is a key factor and it's because it's the by-product of burning energy and rebuilding the body (mostly at night so get good sleep too!) What this means though is there's no easy way, you either need to build a faster metabolism or exercise more.

Of course, eating less helps too as you're not storing more energy than you need. It's a balance. As pointed out in other responses, eat less carbs/sugar (no soda or bottled juices!), eat only good fats (non manufactured) and don't eat anything in a packet/can that has numbers in the ingredients. Frozen or canned vegetables are ok if they're 'plain' without sauces etc. Basically, eat real food.

Buy smaller plates. My partner has a uncanny ability to fill up a dinner plate no matter how big so I ask her to give me the smallest dinner plates we have and don't mound them too high :) If I'm still hungry I've found just a regular hand full of peanuts takes away the hunger pangs. This helps between meals too, plenty of water also helps.