I have a coffee in the morning and my blood sugars are usually higher after that, but I have always attributed it to the ‘dawn syndrome’ where my blood sugars continue to rise in the a.m. and my insulin needs are higher. Am I right of does caffeine have an effect? Also, I was just watching a show where a nutritionist said that ‘diet sodas have a high glycemic index’ ??! Is this true? Does anyone experience effects on blood sugar from drinking diet sodas?