Carbonated drinks contain a lot of pigments, additives, preservatives and other substances, but these ingredients need a lot of water when metabolized in the body, and cola contains caffeine and also has diuretic effect, which will promote water discharge, so carbonated drinks will be more thirsty. In addition, most people don't eat regularly when they travel. If they drink a lot of carbonated drinks, their digestive function will be affected. A large amount of carbon dioxide will inhibit the bacteria in the drinks and also inhibit the beneficial bacteria in the human body, which will easily lead to bloating, affect appetite and even cause gastrointestinal dysfunction. In addition, carbonated drinks generally contain about10% sugar, and a small bottle of calories will reach one or two hundred kilocalories, which is easy to make people fat. For people who travel, although the sugar in it can supplement a certain amount of energy, it will also bring a great burden to the kidneys. Instead of refreshing, it is easy to cause adverse reactions such as fatigue and drowsiness.