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A secretion, which aids the swallowing and digestion of food in the mouth. When talking about the way we taste food, saliva is often overlooked, but as it naturally contains salt (sodium chloride) in about six hundred parts per million (as well as other chemicals) it cannot be discounted. Just drinking water proves the point, as pure distilled water is boring and tasteless to the human palate - as it contains no minerals. In general we like to ingest foods at about our normal saliva-level to find them of any interest. When bearing this in mind, even choosing your favorite bottled water or judging tap water gives food for thought!