Excess gas could be a result of the foods you are eating.
• Gas normally enters your digestive tract when you swallow air and when bacteria in your large intestine break down undigested carbohydrates. You may have more gas symptoms if you swallow more air or consume more of certain foods and drinks.
• Everyone swallows a small amount of air when eating and drinking. Swallowed air that doesn’t leave your stomach when you belch may move into your intestines and pass through to your pouch.
• Gas in the small intestine or colon is usually caused by the digestion or fermentation of undigested food by bacteria found in the bowel. Gas also can form when your digestive system doesn't completely break down certain components in foods, such as gluten, found in most grains, or the sugar in dairy products and fruit.
• Your large intestine contains a large number of bacteria and some fungi and viruses that make up the gut microbiome—the microbes in your digestive tract that help with digestion. Bacteria in the large intestine help break down carbohydrates and create gas in the process.
• Certain foods and drinks contain types of carbohydrates—sugars, starches, and fiber—that your stomach and small intestine don’t fully digest. Undigested carbohydrates will pass to your large intestine, where bacteria break them down and create gas. You may have more gas symptoms if you consume more carbohydrates that your stomach and small intestine don’t fully digest.
• Items that CAN (not will) cause gas include: Alcoholic drinks (including beer), carbonated (fizzy) drinks, beans, peas, lentils, cabbage, cauliflower, cucumbers, onions, milk and dairy products, nuts, radish, soy, sprouts, apples, asparagus, drinking straws & chewing gum (you'll swallow more air), sucking hard candy, melons, mushrooms, corn, broccoli, spinach, cheese, root vegetables,whole grain foods. Try removing one food at a time to see if your gas improves.
• Other sources of intestinal gas may include:
• Food residue in your colon.
• A change in the bacteria in the small intestine.
• Poor absorption of carbohydrates, which can upset the balance of helpful bacteria in your digestive system.
• Constipation, since the longer food waste remains in your colon, the more time it has to ferment.
• A digestive condition, such as lactose or fructose intolerance or celiac disease.
• Foods that are difficult to chew into small pieces allow more air to be swallowed which increases gas production. Peppermint tea is a good home remedy and preventative measure for gas. A cup of peppermint tea can disperse the gas without it coming out through the ostomy pouch. Peppermint capsules can be just as effective.
Incidentally, if you remember, prior to your ostomy, when you used to pass gas through your anus, it did smell 😉 — no different for the gas in your pouch, it will smell. 🙄
If you don't want a pouch full of gas to smell, Coloplast, Convatec , and Hollister all sell deodorants you can add to your pouch. An inexpensive solution is to add a couple of drops of Tea Tree and Peppermint Essential oil to a cotton ball and drop the ball in the pouch — incidentally the cotton ball helps to prevent pancaking if you have a colostomy (pancaking may or may not be a problem for those with Ileostomies). You can certainly use other essential oils like lavender, eucalyptus, etc.