The stomach is where fat and proteins are broken down. The acid in the stomach breaks down proteins, and the bile (produced by the liver and sent to the gall bladder for storage before entering the stomach) breaks down fat. People who have had their gall bladder removed cannot digest fat very well because there is not enough bile in the stomach when it is needed.
It is true that the stomach does not digest carbohydrates, but it is needed even by vegetarians because the nuts and seeds they eat contain both fat and proteins.
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