Coconut Water Vs Sports Drinks: Which Is Better For Hydration? - Tasting Table
Briefly

Hydration is crucial to health, and many Americans do not drink enough water daily. Water restores fluid but does not replace electrolytes such as sodium and potassium lost during exercise. Coconut water and sports drinks both supply fluid and electrolytes, and a clinical trial comparing coconut water (CW), a sports drink (CEB), and plain water (PW) found no statistically significant difference in rehydration index. The trial reported rehydration index values of 1.56 ± 0.14 (CW), 1.36 ± 0.13 (CEB) and 1.71 ± 0.21 (PW). Coconut water typically contains more potassium, lacks artificial flavorings, tastes sweeter, causes less nausea or fullness, and is easier to consume in larger amounts.
I have read 50%, but either way it is a large segment of the population.
The rehydration index, which provided an indication of how much of what was actually ingested was used for body weight restoration, was again not different statistically between trials (1.56 +/- 0.14, 1.36 +/- 0.13 and 1.71 +/- 0.21 for CW, CEB and PW respectively).
CW was significantly sweeter, caused less nausea, fullness and no stomach upset and was also easier to consume in a larger amount compared with CEB and PW.
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