It seems like something from a science fiction novel, but it's not: the human body has a "second brain" composed of two thin layers of more than 100 million nerve cells that run from the esophagus to the tail end of the body. It is a technical network that works independently of the brain and controls its own reflexes and senses. Information and signals are passed through the complex network of neurons to coordinate efforts and move food through the digestive system.
Aging Affects Your Response to Medications: Aging alters the absorption rates and excretion processes of medications from the body in very specific ways. This also means that older people can suffer more drug interactions. There are steps you can take to better understand your medications and protect yourself.