Coffee is slightly acidic (pH 5.0–5.1) and can have a stimulating effect on humans because of its caffeine content. Coffee is one of the most popular drinks in the world. It can be prepared and presented in a variety of ways. The effect of coffee on human health has been a subject of many studies; however, results have varied in terms of coffee’s relative benefit.The majority of recent research suggests that moderate coffee consumption is benign or mildly beneficial in healthy adults. However, the diterpenes in coffee may increase the risk of heart disease.
Tea is an aromatic beverage commonly prepared by pouring hot or boiling water over cured leaves of the Camellia sinensis, an evergreen shrub native to Asia.After water, it is the most widely consumed beverage in the world. Some teas, like Darjeeling and Chinese greens, have a cooling, slightly bitter, and astringent flavour, while others have vastly different profiles that include sweet, nutty, floral, or grassy notes.
Tea originated in China as a medicinal drink. It came to the West via Portuguese priests and merchants, introduced to it there during the 16th century. Drinking tea became fashionable among Britons during the 17th century, who introduced the plant to their possessions in India to bypass a Chinese monopoly.
The phrase herbal tea usually refers to infusions of fruit or herbs made without the tea plant, such as steeps of rosehip,chamomile, or rooibos. These are also known as tisanes or herbal infusions to distinguish them from «tea» as it is commonly construed.