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Started By
Message
Coffee and Blood Glucose
Posted on 2/5/26 at 6:26 am
Posted on 2/5/26 at 6:26 am
I got the diabeatus.
Well controlled with meds and diet, and I wear a CGM.
I have always had sunrise syndrome. I can fast for five days, but my blood sugar will spike in the morning.
But as I’ve watched the pattern and gotten better control, I’ve noticed that coffee seems to add to the spike.
When it comes to earthly pleasures, my morning coffee is second only to one. I really don’t want to give it up.
Is there anything I can do that will let me keep my morning joe?
Well controlled with meds and diet, and I wear a CGM.
I have always had sunrise syndrome. I can fast for five days, but my blood sugar will spike in the morning.
But as I’ve watched the pattern and gotten better control, I’ve noticed that coffee seems to add to the spike.
When it comes to earthly pleasures, my morning coffee is second only to one. I really don’t want to give it up.
Is there anything I can do that will let me keep my morning joe?
4
Posted on 2/5/26 at 6:34 am to RanchoLaPuerto
What are you putting in the coffee? Black coffee alone usually doesn’t spike glucose in most people.
Posted on 2/5/26 at 7:06 am to RanchoLaPuerto
Probably best to talk to your health care team before making any adjustments but it may just be the "dawn phenomenon" causing your spike and not the coffee. I'm a Type 1 and do know that some diabetics experience a spike from caffeine but I'm not certain how common this is.
I'm guessing you already know but the "dawn phenomenon" is when your body releases hormones early in the morning causing your sugar to spike. You could try holding off on any caffeine a few hours after waking up and see if the spike is similar to mornings you have caffeine. If it does this might be more of an indication it's not the coffee.
I'm guessing you already know but the "dawn phenomenon" is when your body releases hormones early in the morning causing your sugar to spike. You could try holding off on any caffeine a few hours after waking up and see if the spike is similar to mornings you have caffeine. If it does this might be more of an indication it's not the coffee.
Posted on 2/5/26 at 7:51 am to Uncle JackD
quote:
Black coffee alone
That’s all I drink. If I’d wanted a cup of cream and sugar, I wouldn’t have asked for coffee.
Posted on 2/5/26 at 8:31 am to RanchoLaPuerto
Easy easy. 
It was just a simple question. How much does it spike your glucose, out of curiosity.
It was just a simple question. How much does it spike your glucose, out of curiosity. Posted on 2/5/26 at 8:56 am to Uncle JackD
quote:
What are you putting in the coffee? Black coffee alone usually doesn’t spike glucose in most people.
It will absolutely spike cortisol which will spike blood glucose. Does it to me every time at least 10-15 pts.
Posted on 2/5/26 at 9:01 am to RanchoLaPuerto
Type 1 or 2? I've read that caffeine can increase insulin resistance in the short term and that seems to hold true for me. I have to increase my insulin dose by a tiny bit if I'm having coffee with breakfast. From what I can tell it doesn't have a long term effect; that is, drinking coffee every morning won't make you more insulin resistant. It just blunts the effect of insulin if you have it with a meal.
Posted on 2/5/26 at 9:16 am to RanchoLaPuerto
Make your first cup some decaf. I know, I know. But get some really good Swiss water process beans. Wait about two hours until you consume regular/caffeine. Report back.
Posted on 2/5/26 at 11:39 am to Shepherd88
quote:
It will absolutely spike cortisol which will spike blood glucose
I usually drink coffee first thing after getting up in the morning.
I was told to eat something, preferably protein, prior to that first cup of coffee to help minimize the cortisol spike.
Posted on 2/5/26 at 12:29 pm to poule deau
Drink water first. Wait about 30 minutes before coffee. That should help reduce cortisol spikes.
Posted on 2/5/26 at 3:37 pm to Uncle JackD
quote:
Easy easy. It was just a simple question. How much does it spike your glucose, out of curiosity.
I’ve got my average down to about 136 and falling. (I’ve clocked an A1C over ten in the past, so that’s good for me.) With weight loss and meds, I can keep it in a normal range some of the time now. Still work to do.
It goes up about 30 points with coffee.
Sorry, I’m a little edgy when it comes to coffee.
Posted on 2/7/26 at 3:28 pm to RanchoLaPuerto
quote:
That’s all I drink. If I’d wanted a cup of cream and sugar, I wouldn’t have asked for coffee.
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