Blackberries are packed full of nutrients and antioxidants, and make a delicious addition to any diet. High in Vitamin C, 100g contains 35% of an individual's RDA of this vital vitamin. The same 100g contains 14% of the RDA of fibre. Blackberries also contain high levels of antioxidants, Vitamin K and Vitamin A. A popular breakfast fruit, blackberries can be added to fruit salads, yoghurts and cereals. They are also great in smoothies and desserts.