If it was 11 hours after the meal, it may not be the meal at all. The way to test the effects of a meal are 2 hours after the meal.
When your body's glucose level drops low, as happens with fasting or indeed anyone dieting, it produces its own glucose via a process called
gluconeogenesis. Otherwise healthy people can go for very many days without food at all and their BG levels will stay betwen 4 and 6. The amount that is released varies and is higher in obese people than people with a normal BMI. It will raise BG levels but your body's insulin should bring it back down.
When I get readings like this, I always take another sample from another finger. Yesterday I got a 7.5 from my middle finger which, for me, is unusual. I then took one from my index finger and it was 5.5. I then took a third from my annular and it was 5.8. Two hours later and I am in the 4s for all these fingers.
It takes just less than an hour for blood to thoroughly mix and, because of the way blood circulates, anything added to your bloodstream may or may not show up if you test for it depending on where you got the sample from.
Also, blood from capillaries is unreliable. It is OK for a quick finger prick check but it is not as reliable as the venous sample that they take for a full blood test. If you get any very odd result, test again on another finger.
I and a couple of other guys used to liken it to a sugar lump floating gently through the bloodstream slowly dissolving.