And so if these two individual monosaccharides will not be formed, then this disaccharide will not be uptaken by the cells of our body. And so there will be a build up in the lactose, in the lumen of our colon and the small intestine. So colon is the large intestine and this causes symptoms such as gastrointestinal discomfort, so flatulate, this basically means the passing of gas digestive problems. So basically the inability to absorb fats, lipids and protein. So diarrhea, watery stool. The question is why?