Blueberries are among the most nutrient-dense berries. A 1-cup (148-gram) serving of blueberries contains (1):

• Fiber: 4 grams

• Vitamin C: 24% of the RDI

• Vitamin K: 36% of the RDI

• Manganese: 25% of the RDI

• Small amounts of various other nutrients

They are also about 85% water, and an entire cup contains only 84 calories, with 15 grams of carbohydrates.

Calorie for calorie, this makes them an excellent source of several important nutrients.