There’s hydrochloric acid in your stomach that starts to break down the food. There are also enzymes, which are molecules that are specialized to break down foods further.
Your stomach also has powerful muscles in the walls of it that churn what’s in your stomach, making sure that the enzymes and acid work as well as possible (same reason a clothes washer mixes your clothing while washing it, although your stomach doesn’t mix things anywhere near that much).
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