"We exhale lost fat. There it helps plants photosynthesize (if you're feeling noble) and contributes to global warming (if you're feeling guilty).

Exhale more CO_2, and you'll lose more weight — especially if you're exhaling more frequently because you're running."
http://www.npr.org/blogs/health/2014/12/16/371210831/when-you-burn-off-that-fat-where-does-it-go

This is being reported as "Breathing more will help you lose weight!", so watch out for that. This is what was ACTUALLY found, and it's just kind of interesting.