For those who find seemingly undigested foods in their stool, you might try chewing your foods more thoroughly. It is recommended to chew until your food is like a paste before swallowing, this greatly assists the digestive process, as digestion starts in the mouth.
Mastication or chewing is the process by which food is crushed and grinded by teeth. It is the first step of digestion and it increases the surface area of foods to allow more efficient break down by enzymes. During the mastication process, the food is positioned between the teeth for grinding by the cheek and tongue. As chewing continues, the food is made softer and warmer, and the enzymes in saliva begin to break down carbohydrates in the food. After chewing, the food (now called a bolus) is swallowed. It enters the esophagus and continues on to the stomach, where the next step of digestion occurs.