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WasntxMe t1_ixumg4y wrote

Put simply, water is the most hydrating option available and helps the body restore itself after processes such as breaking down foods, breathing, sweating, and removing waste. While diet soda may boast zero calories and zero sugar, it doesn’t hydrate as well as water, and it increases the risk for a number of health issues including insomnia, tooth enamel erosion, and dizziness.

Although it contains zero calories and zero sugar, diet soda contains plenty of other ingredients that can affect the body. Preliminary studies have shown tooth enamel erosion, glucose intolerance, and kidney disease to be associated with diet soda consumption

https://goaskalice.columbia.edu/answered-questions/diet-soda-versus-water-workout-and-winner/

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Exciting_Telephone65 t1_ixuq4sc wrote

Oral rehydration therapy, which contains sugar and salts, is more rehydrating than water.

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WasntxMe t1_ixuqpct wrote

Your comment is well outside the scope of the ELI5, but for those interested

> Oral rehydration therapy

in general, oral rehydration solutions should only be used when prescribed by a doctor.

Possible side effects include:

nausea vomiting weakness loss of appetite confusion severe thirst kidney damage

https://www.healthline.com/health/oral-rehydration-solution#risks-and-side-effects

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Exciting_Telephone65 t1_ixut6s4 wrote

Don't know if they put radioactive waste or something in ORT where you live. Effervescent tablets are available literally everywhere and are recommended by absolutely every doctor, nurse, pharmacy and medical institution especially in hot weather. The only people who maybe should avoid them are kidney patients on low sodium diets and they will be specifically told so by their doctors.

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