Fructose is the sweetest monosaccharide. After eating fructose, blood sugar is not easy to rise, which has the effect of moistening skin.
Maltose can also be absorbed by the liver without insulin, which will not cause blood sugar to rise, and can also be eaten by diabetics. It is true that it decomposes to produce glucose, but it is not impossible for diabetics to have too much glucose, but it is necessary to ensure that the blood sugar concentration is not too high. So maltose is suitable for diabetics.
Lactose is not like this. The activity of lactase in adults is lower than that in infancy. Eating lactose can easily lead to the accumulation of small intestine, produce osmosis, make body fluids flow out, and even cause nausea, abdominal pain and diarrhea in severe cases.