London (AFP) - Made out of pig's blood, pork fat and oatmeal, black pudding might seem an unlikely candidate for the shelves of Britain's health food aisles. But the breakfast staple, considered a delicacy in northwest England and the west Midlands, is the surprise inclusion on a list of superfoods to watch in 2016 produced by MuscleFood, a nutritional food retailer. The crumbly blood sausage, traditionally served with hearty favourites like bacon and fried egg, contains high levels of protein, iron, calcium and zinc.