Food digestion begins in the mouth, which is why how you chew your food can have an impact on not only digestion, but weight as well.
Chewing causes the mechanical breakdown of large food molecules into smaller particles. This increases the surface area of food exposed to digestive enzymes, such as salivary amylase that begins the digestion of carbohydrates in the mouth. A lingual lipase is also released in the mouth to begin the breakdown of fat.
How long do you chew your food?