[Lee Stewart]

While deep breaths don't burn too many calories, this is how most burned-off fat exits your body. You may have thought it was mostly through sweat, urine, or some other excretion, but the truth is that as you exercise or go about your day, the majority of the fat you lose—84 percent, according to 2014 research published in the British Medical Journal—is converted into carbon dioxide and leaves your body through your lungs. The remaining 16 percent is converted to water, which exits your body through urine, feces, sweat, tears, or other bodily fluids.