is eating a lot of sugar ok when you have diabeties, if you exercise a lot? I have a friend whom I believe is a type 2 diabetic (NOT 100% sure, but 
pretty sure). We were hanging out and she checked her blood sugar in 
front of me. It was 80, which I believe is normal. 
Then, she started eating sweets, including A LOT of candy and cookies like 
a mad woman! She checked her blood sugar again and it was up to almost 
400, which I  believe VERY high, and 
then proceeded to inject herself with insulin and went to bed. I know just 
eating that kind of food at night is bad for anyone. Is it worse for a 
diabetic? I should state that my friend is a personal trainer and does 
work out a lot. But, I still think it's unhealthy and I am really 
concerned. Is this normal? Should I be concerned?

Summarized question: is eating a lot of sugar ok when you have diabetes if you exercise a lot?