If my blood sugar is 100 in the morning and I take 8 units of humalog to cover breakfast, why is my blood sugar 275 one hour later? My blood sugar returns to 100 four hours after the injection. I am 68 and became a type 1 diabetic at 60. I take 28 units of lantus in the evening. Is there an alternative way to keep my blood sugar from spiking to 275?
Your blood glucose is high one hour after eating because checking that soon after the meal has not given your Humalog enough time to work. On average, Humalog peaks in 90 minutes and continues to work to lower blood glucose 2 to 3 hours after the injection. For this reason, at Joslin we have our patients who take rapid-acting insulin check their blood glucose 3 hours after the meal, rather than 1 or 2 hours after. Eating a high fiber breakfast and adding some protein and fat to the food may also help to keep your post meal blood glucose rise from going too high.