The enzyme Alpha Galactosidase converts oligosaccharides (carbohydrate chains of 3 to 9 together) into smaller sugars like glucose. So your blood sugar goes up as a result, a point of interest if you have diabetes, for example. However, you cannot gain weight by using fibractase forte because the net caloric value of the food remains the same, it is only broken down better and faster by the help of the enzyme in digestion.