1, in general, if the lemonade overnight, but is placed in the refrigerator is very well preserved, it can be drunk, citric acid and air reaction will have sediment, the stomach has a certain degree of stimulation, drink overnight lemonade in fact there is no harm.

2, but lemonade is easy to oxidize, so overnight lemonade water cups tend to leave water spots or water stains, in addition to the high temperature in summer, lemonade is easy to be contaminated by bacteria leading to diarrhea, so at this time or do not drink overnight lemonade as well, for those who have gastric problems, it is not recommended to drink lemonade, which will cause gastric discomfort.