LowCalorie Nutrition

A cup of raw blackberries has 62 calories, less than a gram of fat, 2 grams of protein, no cholesterol and only 1 gram of sodium. It also gives you 7.6 grams of fiber, more fiber than a cup of bran flakes, which provide 7 grams. If you are trying to lose weight, blackberries can give you quick energy, and their fiber content can help you stay full until your next meal, preventing you from wanting to snack on more fattening foods.