I have recently been diagnosed with type 2 diabetes, my average glucose reading is 122 mg/dl [6.8 mmol/L], and I feel good. I have eliminated all junk food and limit my carbs. I have lost 16 pounds and continue to lose weight. However, If I eat a larger then normal meal at supper time ( 25 carbs), there is no great change in my glucose value until the next day. For example: my morning reading will be 128 mg/dl [7.1 mmol/L], but after a zero carb breakfast it will go up to 155 mg/dl [8.6 mmol/L]. Can you please explain?

You should give yourself a big pat on the back for all you have done — eliminating junk food, losing weight etc. I am a little confused about your question. 25 Grams of carb is by no means a high carb meal. Most people can have 30-60 grams of carb combined with some protein and fat per meal. I also don’t know what a no-carb meal means to you — for example, are combination foods allowed that have carb? A high fat meal takes a lot longer to break down so that could explain why you noticed a delay in the breakdown of your dinner until the next morning.

JS
Additional comments from James Michael Schurig, RD, LD, CDE:
I can see you are monitoring blood sugars with response to varying carb intakes which is useful information, but there are factors other than food intake that affect blood sugar excursions as the day goes on. Stress, sickness, activity (or lack thereof) can all affect blood sugars which makes controlling diabetes such a challenging proposition sometimes. I would ask your physician about the patterns you are seeing to see if any changes in medication or meal planning are warranted at this time.

JMS