According to Jane Dickinson, a CDE and a Program Coordinate and Adjunct Associate Professor at Teachers College at Columbia University, “The biggest challenge with alcohol and diabetes is hypoglycemia (low blood glucose) later on. This can happen because the liver is busy detoxing, or breaking down, the alcohol and can’t help out by releasing stored glucose as needed. It’s worth noting that low blood sugars can occur many hours AFTER you drink – which can lead to lows overnight or even into the next day.”
Here’s MyGLU’s excellent 2-page on T1 and alcohol: MyGLU: Did You Know Series: ALCOHOL