This is a bit long, thanks to anyone in advance for reading. I was diagnosed with T1D in July. I’m still trying to figure out a good basal insulin level and the right carb ratios for bolusing. One issue I’m having, for which I can’t find much info when searching the net, is a glucose rise or spike four or more hours after finishing a meal. For example, last night I finished dinner around 7:20. One hour later my glucose level (I use a CGM) was 160, then over the next two hours it went down to 90. I thought “ok, doin pretty good.” Then it shoots up, at one point very rapidly (two arrows up), so that four hours after eating it was 236. Why am I spiking this much four hours after eating (this is not the first time, just one example of a common trend I can’t figure out how to fix or why it’s happening)?
Also, I’ve beein trying lowering my basal and upping my boluses because I keep risking hypos overnight as well as going up over 180 after eating. So yesterday I took 11 u. of Lantus, down from 12 a few days prior, which was down from 13 a few days prior to that. So I think, “ok, I’ll correct this 236 with 0.5 u. of short-acting,” which in the past has always made me go hypo overnight, but I thought with less basal it wouldn’t. Wrong again. At 2:30 I was down to 77 (not hypo yet but it was trending downward so I had 8 grams of sugar).
I really don’t understand these numbers relative to what I am doing and what I’ve been told to expect (e.g. a spike only two hours after eating; short-acting insulin only taking glucose levels down 50 mg/dL per 1 unit.; etc.).
What is possibly causing these very late spikes/rises in blood sugar, and why can’t I correct even just with 0.5 u. without going hypo?