In order to know whether this chilled tea is good or bad for your health, you need to look into the ingredients. The key ingredients of almost all chilled tea are tea, water, sweetener, and flavouring substances. The overall calorie content of the tea will depend a lot on the type of sweetener. If it is sugar or corn syrup, the calorie level will be more. But it will not be as much as that of a carbonated drink for the same volume of the drink. Then there is the tea. Even though there is nothing harmful about having tea once or twice a day, overconsumption of tea can cause some temporary health problems. Tea also contains oxalic acid, which can cause kidney problems if you consume too much of it.