Black tea is the most popular tea in the world, despite being much stronger than green and white tea, which is also very popular.
 It is said that black tea helps to normalize stress hormones in the body, which can be a cause of overweight. It also helps to normalize our blood sugar levels, so it is even recommended for diabetics or can be used prophylactically. Black tea also has body and immune system strengthening properties.
 Black tea, however, contains caffeine, which can interfere with sleep in the evenings, giving extra energy. Therefore, it is recommended to drink it earlier in the morning and no later than in the afternoon.