Have you ever thought why did you fart? Well, of course it is a natural process. But have you ever thought of where gas is coming from?Reporting from healthmeup.com, actually there are two factors that cause fart happen. The first factor is from the food you eat. Thus, when the food is finished digested by enzymes and stomach acids, then generates food waste in the form of hydrogen sulfide. Gas that is then called by a fart.While the second factor is the air you swallow. The air that you swallow it enters the body while you are eating, drinking, speaking, or breathing.Every human fart issued containing 59 percent nitrogen, 21 percent oxygen, carbon dioxide 9 percent, 7 percent and 4 percent methane oxygen. Normal size fart issued by men and women as much as 1.9 liters of gas per day.That's the interesting secrets about the fart that had rarely known. You must remember that the fart is not a shameful thing. Rather it is a natural process and humane. So, never resist a fart for reasons of shame.