I was given a bottle of that type of Coconut Water, it was the Pineapple Flavour. I actually checked the ingredients and it contained added sugar so check ingredients and make sure it has no added sure. Comparing Coconut Water and Orange Juice on Food Standards
http://www.foodstandards.gov.au/consumerinformation/nuttab2010/nuttab2010onlinesearchabledatabase/onlineversion.cfm?&action=getFood&foodID=11B10175
http://www.foodstandards.gov.au/consumerinformation/nuttab2010/nuttab2010onlinesearchabledatabase/onlineversion.cfm?&action=getFood&foodID=01B30319
Orange Juice has a total of 5.6g sugar per 100mls, Coconut Water (young or immature) has a total of 4.7g per 100mls. Basically Orange Juice has 2.95g per 100mls and Coconut Water has 1.8g Fructose per 100mls. Wikipedia does mention that Coconut Water does contain significant amounts of fibre, so I would think that as long as it the ingredients doesn't contain any other added sugar it should be fine in small doses, although I can't imagine needing to drink a significant amount per day.
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