Xanthines are a group of chemical compounds that include well-known substances like caffeine, theobromine, and theophylline. These compounds are naturally found in various plants and are often consumed in beverages such as coffee, tea, and chocolate. Xanthines are known for their stimulating effects on the central nervous system, which can help improve alertness and reduce fatigue. In addition to their stimulating properties, xanthines have other health benefits. For example, theophylline is sometimes used in medicine to treat respiratory conditions like asthma, as it helps relax the airways. Overall, xanthines play a significant role in both our diets and in certain medical treatments.