It is the beauty of roughage that it has no calories in it. With no calories in the roughage, you have many advantages with roughage. Roughage saves you from cancer of colon. roughage gives you smooth motion every day. It absorbs some fatty acids with them and gives you negative calories, probably.
There are four basic food categories that give the body calories (energy); fat, carbohydrate, protein, and alcohol. Fat gives 9 calories per gram. Carbohydrates and proteins give 4 calories per gram. Alcohol gives 7 calories per gram.
The juice of the blueberry is the easiest accessible part of the berry. The juice has energy-stimulating nutrients. The seeds are actually the most nutritious, however they are difficult to chew or digest.