The document discusses soft drinks and their history. It notes that soft drinks typically contain carbonated water, a sweetener like sugar or high-fructose corn syrup, and a flavoring agent. Joseph Priestley first discovered a method of carbonating water in 1767. While initially thought to be healthy, soft drinks are now considered one of the unhealthiest foods due to their acid, sugar, and plastic packaging. The document lists five reasons why people drink soft drinks: thinking they are better than water, boredom, sweet taste, fun, and sugar high.