How is saliva so readily produced? Do we just have reservoirs of water in storage somewhere in our head?
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In the whole history of mankind, as well as history of species before mankind, food was not always ubiquitous, was not always ready on the table just waiting to be eaten. Food was opportunistic, was pure chance. So if you get food out of blue, you wouldn’t sit there and wait three hours for your saliva as well your stomach acid and enzymes to come out enough for your digestion. You’d want to process the food immediately, to avoid getting scooped up, also to have them not contaminated and gone spoiled. Fast secreting of body fluid is an advantage trait through evolution.
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