I've been seeing ads that say caffeinated drinks hydrate you as well as water does. Is this true?
Answer From Katherine Zeratsky, R.D., L.D.
It is true that caffeinated drinks can contribute to your daily fluid requirement.
Drinking caffeine-containing beverages as part of a normal lifestyle doesn't cause fluid loss in excess of the volume ingested. While caffeinated drinks may have a mild diuretic effect — meaning that they may cause the need to urinate — they don't appear to increase the risk of dehydration.
https://www.mayoclinic.org/healthy-life ... q-20057965
