Fun Facts 1.The digestive system is the process that breakdown of food and chemical alternation of food. 2. The esophagus is approximately 25cm long. M70-year-olds may produce as little as half the enzymes they produced when they were 20. muscles contract in waves to move the food down the esophagus. This means that food would get to a person's stomach, even if they were standing on their head. 3. Every day 11.5 liters of digested food, liquids and digestive juices flow through the digestive system, but only 100mls is lost in faces. 4. In the mouth, food is either cooled or warmed to a more suitable temperature. 5. 70-year-olds may produce as little as half the enzymes they produced when they were 20. 6. By age 50, many people will produce only 15% of the HCL they released at age 25, and about a third of all people over the age of 65 secrete.