Can Diet Coke Raise Blood Sugar Levels? – Diabetes
For some DMers like us, caffeine or other stimulants can result in higher blood sugar. Your experiment to cut down/out on Diet Coke might help you see if that’s the culprit.
Sometimes, in our early stages with Type 1, we have what’s called a honeymoon, during which time (which can last for about a year) our bodies are still able to produce some insulin. Once the honeymoon is over and we’ve lost that ability completely, it is normal and natural that our need for insulin will increase. It’s not a steady increase, but we’ll experience another — but higher — need for basal (long-acting) and/or bolus (short-acting, to cover food) insuiln.
If your higher numbers are in the morning (for example, if your preferred source of morning caffeine is a diet cola and not coffee or tea), then you might now have another common experience called Dawn Phenomemon where we are more resistant in the morning. I think this is related to the surge of “get up & go” hormones that our bodies release in the morning.
Finally, if you’re drinking diet soda from a soda fountain, it is also all too common that the soda labelled “Diet XYZ” might not really be pouring that beverage. Lines get crossed, mixed, etc. If you’re drinking from cans or bottles, then you’re getting the real thing. 
I’m not a physician, but have shared my personal experiences. If you can’t seem to explain and/or knock down your highs predictably, it’s time to share the info, patterns, and test results with your endocrinologist and/or a certified diabetes educator. They’ll work with you and your particulars to ID the source of the highs and to figure out effective ways to treat ‘em.
Good luck. I’d love to hear back from you when you’ve figured it out.
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