The document is a letter from the liver describing the important functions it performs for the body and pleading with the reader to take care of it. The liver stores nutrients, produces bile to aid digestion, detoxifies harmful substances, stores energy, produces blood and proteins, removes toxins from the air, helps with blood clotting, and fights infections. It warns that overuse of alcohol, drugs, medications, and fatty foods can damage it permanently. The liver asks that people have their doctor check on it through blood tests and scans if problems are suspected in order to catch any issues early.