Enough calories but not too much sugar?

All this seems to have gotten way off topic of what the OP asked, which was suggestions for food that has high(er) calories without sugar. I still say fat and protein is the answer to that question.

But there is no one single answer to how sugar is digested. Sugar is processed differently in people with diabetes or insulin resistance than in those without it. It's even processed differently in those with type 1 diabetes than it is by those with type 2. There is some good information in this link if you are interested.

http://www.hsph.harvard.edu/nutritionsource/what-should-you-eat/carbohydrates-full-story/index.html#when-sugar-management