No I didn't know there was so many carbs in it thanks for that.
The big clue is the word wheat - anything made or based on wheat is likely to be in the high carb category. Wheat is probably the core of most of the high carb food in western society. Wheat = flour = pastry, bread, cake, pasta, biscuits, cereals etc.etc.
Wheat is something like 70+% carb and the rest is fibre and a little fat, so anything based on it is going to need serious consideration. The best habit you can get into is ensuring that you always take your reading glasses with you when you go shopping - if you need them, that is. I bought a 99p pair of readers that I just pop in my coat pocket to bring out to read labels. Always check the carbohydrate aspect of the nutritional data and then try and work out how many carbs there would be in a typical serving.
I didn't have my glasses with me one day and asked my husband what the carb content was of a seasoning packet I was looking at. He declared it to be
far too high for you. Yes, okay, but what's the number and he said something like 19g per 100g. When I pointed out that I'd have to eat 15 packets of the stuff to eat 19g, he realised that the number itself was probably not the full story. So you need to remember to work out what you're likely to eat in one sitting too.
And also be aware that manufacturers are sneaky too. They're legally required to tell us how much sugar there is in something, but that's not the full story for us either. Nestle proudly declare that Shredded Wheat is only 0.3g sugar per serving - allowing it to have a green flash on the pack front. But the total carbohydrate is the number that matters to us - in this case - a serving of 45g is 37g of carbs. So check the table on the back, not just the big headline numbers on the front - they tell you the version they want to promote, not the whole story.
It's also worth noting that you had a sharp spike (I hate that word) after eating, but it dropped very quickly too. This phenomena in itself is undesirable too - it's preferable to try and even out the hills and troughs in your BG numbers (and hark at me as mine look like an eathquake on a seismometer at the moment whilst I'm changing insulin) - so a big portion of carbs will do this - peak dramatically and drop equally so. If you'd had one shredded wheat and yogurt or something fatty instead, you'd find that you have a slower rise and fall. And you'd probably feel fuller for longer too.
So there's a lot to learn, I appreciate that, but if you do eat some carbs, mix them with fat and protein too, to ensure a more sustained and even release of energy and greater satiety from the meal too.