Some scientists believe that tea's beneficial effects may be the result of the naturally occurring compounds in tea called flavonoids, which have antioxidant properties. In the body, antioxidants are believed to work to neutralize harmful molecules called free radicals that, over time, can damage cells and tissues and contribute to chronic disease. Interestingly, laboratory research indicates that tea has similar or higher antioxidant properties than many fruits and vegetables.

While tea should not be considered a substitute for fruits and vegetables, it may be a valuable addition to a healthy, well balanced diet. Studies suggest that the flavonoids and other natural components in tea may also be beneficial in maintaining a healthy cardiovascular system and supporting dental health.

Generally speaking, a cup of Green tea has about 10% of the caffeine found in a cup of coffee, while a cup of Black tea contains about 33%. The caffeine content of Oolong tea varies and depends on the oxidation process of each type of Oolong tea. Basically, the caffeine content of Oolong tea is between that of Green and Black tea.

It should also be noted that the types of caffeine found in tea and coffee have different properties thereby affecting everyone differently.