Fresh blackberries (Rubus spp.) are deeply pigmented berries with a juicy texture and sweet-tart flavor. They are particularly rich in fiber and provide vitamin C, vitamin K1, manganese, and a diverse mixture of polyphenols. Their purple-black color comes primarily from anthocyanins, particularly cyanidin-based compounds, while blackberries also provide ellagitannins, ellagic acid, and other flavonoids. With nearly 8 grams of fiber per cup, blackberries are one of the more fiber-rich fresh fruits and an easy way to add both fiber and protective plant compounds to breakfasts, smoothies, snacks, salads, and desserts.