When I had a stroke, my blood sugar skyrocketed. They were giving me insulin - only time in my life I’ve had it. They injected me for about 20 days. This had NOTHING to do with what I was eating.
The 3rd day I was in the hospital the head nutritionist came to my bedside and asked me why I wasn’t eating. I told her she was giving me about 3 times the carbs in ONE meal that I normally eat in 3 days. She asked me what I would eat, I told her eggs and bacon, no toast. Chef’s salad, no dressing unless she had olive oil. Grilled chicken thigh and broccoli. She started sending me meals like that, and I started eating again.
When I researched the “high blood sugar not food related” thing, I discovered that when you have a traumatic injury (a stroke is considered a traumatic injury), your body (picture it like a gyroscope) “wobbles”, trying to regain equilibrium. Your high blood sugar is part of your body trying to return to normal.