I think in my case it was eating too many sweets. I cut them out completely. I also eating some foods that purport to help with lowering blood sugar, like oat meal, cinnamon, some greens, and a few other things.

I also bough a glucose meter. Here are my readings after abstaining from the sweets for 32 hours, 104, 78 135, 102 (most recent first).

The numbers were much higher on Wednesday, 184, 229, 258.

The 258 was after a meal. I also finish off the remaining chocolate chips. I slept for two hours, and tested getting the 258.

-Mark-