> Needless to say, smoothies are really not for diabetics or athletes! This is the number one issue with smoothies. A slow and steady blood sugar / nutrition delivery is better for everything.

With the exception that eating high GI carbs/sugar before doing a high intensity activity is not problematic, because it will be consumed directly by the muscles as "fuel" and might even improve performance. But yes otherwise (ie the majority of the time) I agree.