Fruits with a dark color, like blackberries, are rich in antioxidants, which may help prevent illness and disease. Blackberries are high in fiber and low in calories. A 100-gram serving of fresh blackberries contains 43 calories and 14% of the recommended daily intake of fiber.  Blackberries contain 23 grams of vitamin C per 100 grams, which is about 33% of the recommended daily intake level. When you eat blackberries, you'll also receive vitamins A, B, E, and K. Blackberries also contain essential minerals including copper, niacin, folic acid, and anthocyanins, which are powerful phytonutrients that help reduce inflammation in the body.