If a human has not eaten in 6 days,
o Would blood glucose levels be high or low?
The answer is simple, your glucose will be dangerously high.
o Would ketones be in the blood?
Yes, yes they would.
o Would glucagon levels in the blood be high or low?
I am not exactly sure about this, but I know that when you haven't eaten your body prevents your blood sugar from getting too low by releasing glucagon levels. So I assume it'd be high?
That's all I can answer, Hope this helped
~ Karma