Iced tea is divided into homemade iced tea and purchase of commercially available blended drinks iced tea, in either case drinking too much has a certain impact on health. In contrast, the impact of blended iced tea drinks is greater, while homemade iced tea is relatively healthy if you do not add sugar or honey in addition to black tea. 1, blended iced tea: commercially blended iced tea drinks usually add a lot of sugar, excessive drinking may lead to obesity; some people use iced tea drinks instead of water, which will increase the risk of type 2 diabetes, the endocrine system and the cardiovascular system will be adversely affected. This can increase the risk of type 2 diabetes and have a negative impact on the endocrine system and the cardiovascular system; gout patients are also unsuitable for iced tea and other drinks with too much sugar; 2. Homemade iced tea: homemade iced tea is relatively safer without the addition of sugar, but the ellagic acid in tea can easily affect the absorption of calcium, especially during the development of adolescents is not recommended to drink too much iced tea or tea products. Tea polyphenols, theophylline and other substances in the tea easily stimulate the cerebral cortex excitation, drink more than easy to cause insomnia. In addition, iced tea iced although cool and summer, but easy on the gastric mucosa stimulation, causing stomach spasm contraction, drink too much will make the gastric mucosa damage and thus affect the digestive function.