Here is my own view;
When we think of good food we want to eat, we are tickling our appetite. When we do so, our salivary glands produce more saliva (hence our mouth "watering") in lieu of the effects to our appetite.
Saliva contains enzymes and lubricants that help you begin the process of digestion as soon as food gets in your mouth. When you think of savory food, your body takes this as a cue to start gearing up for another round of digestion.
Your 3 salivary glands (parotids, sublinguals, and submentals) begin excreting what they have stored and producing more for the upcoming morsel.
This process of preparing to begin digesting food manifests a "watering" in your mouth. People with Sjogren's Syndrome lose their salivary glands, therefore their mouths don't undergo the same "watering" reaction that most people experience in response to savory food.
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