If all you had all day was a low-fat yoghurt and a cappuchino, it's highly likely that your liver kicked in to help with a shot of glucose.
Also, if you'd nibbled the sourdough/raspberries close to the time you ate, your BGs may have spiked just before your proper meal. How much is a "nibble"?
I like to have Atkins "Daybreak" bars in the house for just such a busy day occasion. I also take them on long journeys. They are portable and easy to eat, though quite expensive. This is not an advert - other similar low-carb snacks must be available! :wink:
Viv 8)