How long after eating was the 9.0? And where was that relative to the yog?
Fish cake - including potato I assume - plus chips is a lot of starchy carb. If there was a lot of fat in there as well it could have slowed down the carbs significantly. So the peak from the meal could have been later than normal (closer to 90 mins than a normal 60 for example). With pasta of course, you can get the peak even later than that.
Was the muller fat free? As with most products, when they remove the fat, they replace it with carbs. Usually fast carbs and quite often sugars. So anything which is low fat runs the risk of hitting your BG like a hammer. I've known low fat yogs to spike me by 6 points before. If you were high in the first place then its a distinct possibility.
It all comes down to testing more than anything else. If you were to test before the meal, then a 1 hour after reading would tell you the spike of the meal (generally - cos it varies). I aim for under 8 at the one hour. Then 6.5 at the 2 hour.
Not knowing how the main meal affected you and at what time, its hard to guess what kicked you up to that level and for how long.
This is why I advocate Jennifer's advice - which allows you to learn about the effects of a meal so that you know how it will affect you next time. Doing just a 2 hour test tells you very little if you do not know how high you were when you started. It also misses the peak, which may be the cause of damage. I'd rather be at 6.5 after an hour and stay there for a couple of hours rather than hit 12.0 after an hour and 6.0 after 2.
You can also test the effects of something like a yog by doing it at a time well away from any other food.
Now I know this may sound like testing 20 times a day, but you don't have to test every meal. Generally I suggest people start with breakfast for a few days, get that right and move onto lunch. This is partly because getting the start of the day right gives you better results for the rest of the day. Its partly because people listen to their dieticians and eat a meal that is mostly carbs at a time when insulin resistance is at its worst. So people give themselves scary spikes at breakfast.
Anyway, the important thing is to learn from testing so that you know how combinations of foods affect your BG, then make food decisions in future based on that knowledge.
Hope this helps.
