MGAM2 and Schnyder corneal dystrophy: At the same time, in the IGT and T2D groups, a decrease in glucoamylase activity in the duodenum was observed (in the IGT group: by 34.4%, p < 0.05 and 39.8%, p < 0.0027, and in the T2D group: by 25.0%, p < 0.05 and 33.2%, p < 0.0027, compared to the HFD and SCD groups, respectively).