Thanks for responding, onebowl. After I posted this I went out into Internet land and learned similar things on other forums.
The lunch I had which made the 163 to 107 spike and drop was a salad bar salad. It's the same salad bar I've been eating at for years, but recently I've allowed myself small quantities of items I've been passing on for years. (Just discouraged because the weight loss stopped, and I was tired of sacrificing and not losing more weight for the sacrifice.
) There are a number of things in the salad which might have caused the rise: beans, pasta salad, tuna salad, cottage cheese. Those are the ones that jump to mind. I had a similar salad last night without the "bad guys" and had a hamburger with it, and my BG at 1 and 2 hours was 110 and 106 (98 right before the meal). The salad last night was also much smaller than the one I had for lunch two days ago.
The dinner that caused the slow rise that confused me was two poached eggs on rice and almond bread. That's all. I love poached eggs on toast and have missed that meal. (Not the same without the toast.) So recently I've been allowing a bit more carb into my diet, and one thing was a piece of bread for my poached eggs. Normally I don't eat this for dinner. I've never felt so crappy after eating it for breakfast. Maybe the cream and coconut oil in my morning coffee helps?
Anyway I feel empowered with this blood sugar testing. It's not something that non-diabetics usually do. Yesterday I went back to low-carb basics. I tested numerous times during the day, including 2 or 3 times after each meal and once before a meal. The highest number was the morning measurement of 118. All others were between 92 and 110.
I feel more in control. I'm going to keep trying other foods as you suggested. It gets expensive, but eventually I guess I'll learn what to eat and what to avoid and I can test less often.