"Mother Nature's sports drink" is becoming the thirst-quencher of choice at local gyms and health food stores.
Coconut water -- not to be confused with coconut milk, which is made from the flesh of the fruit -- is the unadulterated liquid found inside young green coconuts.
It is being sold as an all-natural beverage with no added sugars or artificial flavors.
It has roughly 15 times more potassium than sports drinks, with zero fat and cholesterol. But it is not calorie free: An 11.2-ounce, single-serving carton has 60 calories.
Potassium is an electrolyte essential for muscle and nerve functioning and muscle growth. Bananas are a common source of potassium, but according to VitaCoco, a popular brand, an 8.5-ounce box of coconut water contains more potassium than two bananas.
Nutritionist Alan Titchenal said coconut water might not provide appropriate hydration for intense workouts over a longer period of time.
"Coconut water could serve as a sports beverage, but it may be too low in sodium, the main electrolyte lost in sweat during endurance exercise," said Titchenal, an associate professor in the Department of Human Nutrition, Food and Animal Sciences in the College of Tropical Agriculture and Human Resources at the University of Hawaii.
