Shaunquetta N. Johnson
The main components of rectal gas are oxygen, nitrogen, carbon dioxide, hydrogen, methane. The odor comes from sulfur picked up from bacteria in the large intestine. Three-fourths of flatulence is hydrogen, methane, and CO2 which are odorless bacterial gases. Gas can comes from swallowed air passed through the rectum or a breakdown of undigested nutrients. Bacteria in the large intestine digest foods that the small intestine cannot break down. During this process, the large intestine produces gas and the contractions of muscles in the intestine eventually cause some of this gas to pass out through the rectum to form a "fart". Passing gas 13-21 times a day is normal. Foods that produce gas in one person may not cause gas in another. Beans and legumes are major hydrogen gas producers because they contain a special type of carbohydrate that's poorly absorbed but quickly digested by bacteria in the intestines. Sulfur-containing proteins and amino acids produce gas with a potent odor
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Here is a list of flatulence-causing food and drinks
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cabbage
broccoli
brussels sprouts
cauliflower
dried apricot
beans
fiber
corn
grapes/raisins
onions
turnips
cucumber
nuts
oats
pancake/waffle syrup
apples
cherries
peaches
pears
"sugar-free" items
Beverages – apple juice, orange juice, milk, carbonated drinks, wine