While it is true that gas formation occurring by the digestion of food from bacteria, occurs mostly in the large colon around 24 hours and longer after consuming food, gas can also occur in the upper GI tract (esophagus, stomach, small intestine, and large intestine) soon after eating..
Upper GI gas, can come from swallowed air (occurs in everyone, but more in certain individuals - often from eating quickly, drinking carbonated drinks, smoking, chewing gum or dentures)
Additionally, carbon dioxide (a gas) is released when stomach acids mix with the bicarbonate in digestive juices (during digestion) soon after eating in the stomach. Carbohydrates for example tend to cause more gas in the stomach and small intestine than do protein... Certain medical conditions such as delayed digestion can result in more gas in the upper GI as well.
So,yes, it is possible that you are experiencing gas right after eating related to the type of food you are eating.
I hope this helps you in discussing this issue with your friend.
Please feel free to follow up with any questions you may have..
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