A 100 gram serving of raw blackberries supplies 43 calories and 5 grams of dietary fiber or 25% of the recommended Daily Value.
Blackberries contain numerous large seeds that are not always preferred by consumers. The seeds contain oil rich in omega-3 (alpha-linolenic acid) and -6 fats (linoleic acid) as well as protein, dietary fiber, carotenoids, ellagitannins and ellagic acid.
