@turquoise-- I believe there are about thirty calories in a serving. A serving is 100 grams.
Kabocha squash has a medium glycemic index score. So it's not great for diabetics, but it's okay in moderation. The way you cook the squash is important too. You can lower the glycemic index of boiled or steamed Kabocha squash by adding butter for example. But then, the calorie content will go up.
I have diabetes and I love Kabocha squash. I think it's my favorite out of all squash varieties. I don't find it very often and when I do, I try not to have more than a cup. I could easily eat a lot more but I control myself.