Coconut water is the fluid found inside young coconuts. It has a sweet, slightly funky flavor and is cloudy-clear in color. It's much lower in sugar than other fruit juices, and therefore also lower in calories. For example, a cup of orange juice has 112 calories and 21 grams of sugar, while a cup of coconut water has 46 calories and 6 grams of sugar. The coconut water also provides 2 grams of protein, 0.5 grams of fat and 2.5 grams of fiber, all of which slow digestion and help prevent your blood sugar from spiking.