First and foremost, your food should come from a well-balanced meal such as fruit, vegetables and grains. Yes, that's why I'm into balance. Eat a variety, not just one thing all the time. You may be chewing gum, and that is bringing in more air. Check how many pieces you're chewing a day.
Breathing exercises helps with that.
That's what I do. Think calories in and calories out. Personally, I know how much better I feel after a workout. I have a feeling of self-accomplishment. I want to stay young, to keep things firm and toned so that nothing sags.