A cool soda water can't quench your thirst when it's hot and dry in summer. It can be said that soda water is the protagonist of summer health drinks, and its unique refreshing taste is deeply loved by young people. However, in the mouth of some soda merchants and some online bloggers, soda water not only "prevents gout", but also has various "health effects", such as helping to lose weight, neutralizing stomach acid, and antioxidation... Is this the case? First, the entry definition of soda water in online encyclopedia specifically refers to "aqueous solution of sodium bicarbonate" - whether it is naturally formed or artificially produced, the key must be sodium bicarbonate. In English, "soda water" is also called "carbonated water" and "sparkling water", which does not have to have sodium bicarbonate. Second, soda water can't alleviate gout. Even an animal experiment shows that a large amount of sodium bicarbonate leads to gout symptoms. In medicine, sodium bicarbonate is used to assist uric acid lowering drugs. Note that sodium bicarbonate assists "uric acid lowering drugs" rather than "uric acid lowering drugs" itself. Sodium bicarbonate is not eaten casually, and it needs to be taken under the guidance of a doctor. Long term consumption of sodium bicarbonate may cause acid-base imbalance in human body, especially in the elderly, infirm people with abnormal renal function, or people with serious respiratory diseases. Third, there is a legend that "soda helps lose weight", but it means that drinking soda before meals is conducive to reducing food intake. Theoretically, drinking any water before meals can play such a role, because you will feel full - of course, it will also lead to hunger faster. In the final analysis, we still rely on perseverance to "carry" the feeling of hunger. Whether the gas in soda water can produce a stronger sense of satiety depends on everyone's specific feelings, not how others feel. Fourth, soda water can alleviate excessive gastric acid, but it has no significance for people with normal gastric acid. This function is interpreted as "nourishing the stomach", which is a sneaky concept. "Relieving dyspepsia and constipation" is just a folk tale, and there is no reliable clinical evidence. Fifthly, the marketing advertisement claims that "soda water has antioxidant effect and can prevent skin aging; the combination of lemon + soda water helps to enhance appetite, prevent skin aging and maintain beauty", which is a "marketing effect" created according to consumers' expectations, rather than a "actual effect" based on scientific evidence. In short, these statements come from the advertising department or public relations department, not from the R & D department or nutrition department. Therefore, in conclusion, carbonated beverages are healthier choices than sugarless soda (not sugar free carbonated beverages here) and carbonated beverages from weak acid to weak base (strong acidity is detrimental to tooth health); Compared with pure water, soda water has some taste, which makes drinking water more pleasant. However, it should be noted that soda water may contain more sodium bicarbonate, which is detrimental to "salt reduction". (outlook new era)