Why can't a diabetic patient eat more carbs and take for that more insulin?

Some diabetics can do this safely and effectively, but each case is different. Discuss with the doctor who manages your diabetes.

You could ask a dietician to teach you “carbohydrate counting.” You could also ask your healthcare provider about “continuous glucose monitoring” to see how much certain foods raise your blood sugar. Eating more carbs and using more insulin can lead to considerable weight gain, which will lead to problems like increased fatty liver and heart disease. So be careful!