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MJB

Does black coffee raise your BG?

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MJB

My fasting BG at 7AM this morning was 145 which is usual for me as I always have dawn phenomenon. After taking my dogs out I ate a small cheese stick (0 carbs) and made a pot of coffee. I had 3 cups (black). About an hour later I took 500mg metformin and then I had 2 pork sausage patties and 2 fried eggs for breakfast (0 carbs).  About 11:30AM my BG was 173. No carbs, yet my BG went up considerably. For lunch at 12PM I had a slice of low carb cheesecake (almond crust) and then went for a 20 minute walk. At 4PM my BG was down to 111. Tomorrow I'm not drinking any coffee and we will see what happens.

 

Anyone else have black coffee, or other caffeine, raise your BG?

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steel

Hi MJB, I've read that caffeine raises BG in some people. So, it's not unusual.

I drink it rarely (and not very strong) because I get palpitations. I had some last night, but I didn't spike from it. 3 cups of black coffee may have impacted my BG.

 

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dowling gram

I have about 5 cups of coffee every day and it does nothing to my BG. It might raise some people's Bg but I Wouldn't know about that. I wonder if it was the length of time before you ate and exercise(walking the dogs) that raised your BG and not coffee.

 

When you exercise first the body uses up available blood glucose---you had none-- then the liver jumps in and releases stored glucose for energy so your BG goes up. Later on you ate some carbs and went for a walk. Your body had BG from the carbs you ate so it didn't effect your BG. Try eating a few carbs before you walk the dogs and see if that helps or if it really is the coffee.

 

I know when I overindulge in carbs and immediately ride the stationary bike or go for a short walk my BG. goes down

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MJB

No coffee today otherwise pretty much the same results. 11:30 AM BG was 151 so down a little from yesterday's level. I'm going to skip my afternoon walk today and see what my 4PM reading is. I don't think it's the coffee, I think just a liver dump of glucose. I may need to exercize more or maybe increase my met from the current 500 mg twice a day.

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ran23

112 this morning, 124 after breakfast and a shower.   2-3 cups of black coffee, may look into this now. 

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Kit

I've never had a rise from coffee or tea though I don't drink a lot of tea and I almost never touch coffee.

 

However, I will get a liver dump if I delay breakfast in the morning by more than about a half hour after getting up.

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