The content of water-soluble protein in green tea which can be absorbed directly by drinking tea is about 2%. Green tea contains more than 25 kinds of amino acids, among which isoleucine, leucine, lysine, phenylalanine, threonine and valine are six of the eight essential amino acids. There is also histidine needed for the growth and development of babies. Although the content of these amino acids in green tea is not high, it can be used as a supplement to the lack of daily needs of human body.
Black tea is mild in nature and mellow in aroma, which helps to strengthen bones first. Researchers from Cambridge University School of Medicine investigated the diet and bone mineral density of 256 women aged 65-76 who lived nearby. The results show that tea is rich in flavonoids, which can reduce the risk of osteoporosis in women. Secondly, drinking black tea can prevent and treat influenza, myocardial infarction, stroke and skin diseases.