Let's start with some basic biology. It's a simple fact that the human stomach doesn't fully digest wheat. Cows, sheep, and other ruminant animals do just fine with wheat because they have more than one stomach to complete the digestion process. When the partially digested wheat leaves their stomach, it goes to another stomach where it is further broken down, then to another and another until the process is complete.
Unlike our bovine buddies, we humans have only one stomach. When the wheat leaves our tummies, it's not fully digested. Those undigested portions begin to ferment, and do you know what the byproduct of fermentation is? Gas. Icky, belchable, fart-forming gas. For many people, this accounts for the gas and bloating they feel after they eat wheat, whether they have gluten sensitivity or not.
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