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.
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.