Am I doing damage when

After a higher carb meal – my PP at 1hr was 163 at 2 hrs it was 133 and 3hrs it went down to: 93

I have been feeling a bit flat lately and decided to have some "bad" carbs in my lunch time meal – namely a Beef Pie and as a result the above readings. Is this high BS doing damage to my body or is it ok to have something like this occassionaly?