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2. Saliva

The second step in digestion also takes place in the mouth. While you are chewing, saliva mixes with the food. The saliva starts the process of breaking this food down into a form your body can convert into energy. Without saliva, the body cannot absorb the nutritional benefits -- this is another reason why the longer you chew your food, the better: the more saliva with which the food is saturated, the most you'll get out of it during the rest of its journey.

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