Once food is in the mouth it is bathed in saliva. Saliva adds moisture to the food that is being chewed. This will improve the ease of swallowing. Each day we will produce about 1 to 1.5 quarts (liters) of saliva. Furthermore, saliva also contains both a carbohydrate and lipid digestive enzyme that begins the chemical digestive process. Once we swallow, food travels through the esophagus and depots in the stomach.
Our digestive tract is over 20 feet long and serves to chemically and physically breakdown food and absorb nutrients
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