Lactose, also called milk sugar, is found in milk and other dairy products. While it can certainly cause you to store body fat if consumed in excess, it's no more likely to do so than any other component of diet.Despite the common name milk sugar, lactose doesn't actually taste particularly sweet.actose, also called milk sugar, is found in milk and other dairy products. While it can certainly cause you to store body fat if consumed in excess, it's no more likely to do so than any other component of diet.