The digestive process begins as soon as food enters the mouth. As we chew our food we increase the surface area of food particles making the food more susceptible to digestive enzymes. Smaller food particles also travel more easily (and quickly) throughout the small and large intestines. In the stomach, food is mixed with gastric juices containing digestive enzymes and hydrochloric acid. This mixture is known as chyme. From the stomach, the chyme moves into the small intestine. There, more enzymes and bile are mixed with the chyme, and the breakdown of dietary proteins, fats and carbs is complete. Some carbs are not digested by human enzymes and they pass undigested into the colon.