Fermenting fruit happens due to yeast. There are bacteria that can cause fermentation like for making yogurt or sauerkraut. This type of fermentation produces very little alcohol. Your stomach has many types of bacteria. They break down your food and in doing some of them give off by products containing sulphur, which is the stinky gas. So fermentation for alcohol seperate thing done by yeast; bacteria fermentation does not make alcohol; the bacteria in your stomach are breaking down the food not fermenting it.
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