Purines are chemical compounds found in the cells of all living things, including humans, animals, and plants. They are molecules made up of carbon and nitrogen atoms and are found in cells DNA and RNA. Purines are divided into two categories: endogenous purines and exogenous purines. Endogenous purines are produced by the human body and found inside its cells, while exogenous purines are absorbed by the body through the foods that you eat. When purines are broken down in the digestive system, uric acid forms. A buildup of uric acid crystals in the joints can cause certain health issues, such as kidney stones and gout, a type of arthritis. Therefore, people who have trouble metabolizing purines, such as those diagnosed with hyperuricemia or gout, are advised to limit consumption of high-purine foods and drinks. Some examples of high-purine foods to avoid include organ meats, game meats, certain seafood, and sweetened beverages.