Sometimes this gas is produced in such huge quantities that the sulfide
oxidase enzyme in the wall of the gut is not able to oxidize all of it and convert it to thiosulfate. This gas has a smell of rotten eggs or fishy smell. You need to cut down food items that contain sulfites. Most of this gas comes from sulfites a person consumes, which is a part of all preservatives. Sulfites are present in all juices, molasses, yellow dye in ready made food stuffs, and red wine.