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Blood sugar decreases after meals rather than increasing-anyone know why?

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Old 07-23-2007, 02:47 AM   #1
Join Date: Jul 2007
Location: Turlock, CA
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busytiredmom4 HB User
Blood sugar decreases after meals rather than increasing-anyone know why?

I'm a newly diagnosed Type 2 and not on any diabetes meds. Basically, my BG drops rapidly after meals. Sometimes it will increase for a little while, but then it drops. I'll test first thing in morning-usually around 80-110. Bedtimes are low too. My problem is around meals. I always test right before a meal and I've tested anywhere from 15 minutes-3 hours after a meal and my BG drops rapidly. Yesterday, for example, my waking BG was 124 at 10:25am. Had a light breakfast at 10:55am and BG was 194 at 11:35am.By 11:55am, BG was 151 (dropped 43 points in 20 minutes!). Another 15 minutes after that, it dropped another 6 points. There have only been a few occasions where my BG has increased after a meal.

I've used 3 different monitors (2 brands) and they calibrated fine. I've done experiments with testing quite often throughout the day just to see what's going on. I'm consistent with my testing. I eat pretty much the same type of food everyday. I cannot think of why this would happen. The only thing I can think of is that my body metabolizes the blood glucose extremely quick which is why is decreases rapidly, which I guess is good in a way.

I used to have bad case of hypoglycemia 4 years ago and my lowest tested BG was 26 after a meal which makes me think the same thing was happening back then because if I ate something and my BG was still that low then it must have decreased. At that specific time, I was not experiencing hypoglycemic symptoms at all, which I should have.

I do want to mention also, that my BG levels are all over the place. Currently my lowest has been 61 (at bedtime) and my highest 194 (after meal). My fasting BG have been 140-173. This really confuses me and I'm not going to the doc for a couple more weeks, but I have to know now before it drives me crazy. It's bothering me a lot. Any opinions would be greatly appreciated. Thanks!


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Old 07-23-2007, 06:37 AM   #2
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Join Date: Apr 2007
Location: Baltimore, MD, USA
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rraszews HB User
Re: Blood sugar decreases after meals rather than increasing-anyone know why?

Something like this happens to me a lot, especially before I got my morning numbers down. I'd go from 150 when I first woke up to like 110 after breakfast. Even now, I'll sometimes go from like 99 to 80.

The way my diabetes educator explained it, the way my diabetes has affected me, my blood sugar is most normal shortly after I eat, and gets farther out of whack the longer I go without eating, so if my bg starts out high, once I eat, it'll do the "normal" thing blood sugar is supposed to do: go up for a bit, then come back down quickly, and because my bg is behaving closer to "normal", it'll come all the way back down to a normal level.

But the timeframe you describe doesn't actually sound all that unusual. BG goes up rapidly when you eat, and, normally, drops rapidly after a few hours. Being high 30 minutes after you eat is not unusual -- I'm not sure that the test results are even accurate that close to a meal. Most people tell you that you shouldn't test at all for two hours after eating (My doctor and educator both said *one* hour. I have no idea why, but the standard wisdom is to trust your doctor whenever there's a conflict between him and the advice of the internet hivemind)

Old 07-23-2007, 08:20 AM   #3
Join Date: Jul 2007
Location: Turlock, CA
Posts: 2
busytiredmom4 HB User
Re: Blood sugar decreases after meals rather than increasing-anyone know why?

Oh my god! This is the first answer I've received on many message boards that makes sense! Your situation sounds just like mine. I'm all out of whack when I don't eat, whether high or low. My numbers are actually quite normal after I eat. I only tested before the 1 hour mark just as an experiment. I tested every 30 minutes for 3 hours and it kept dropping. Usually I do wait 1 hour to test. I guess food affects everyone different and no diabetes are the same. Thank you so much for your input-it makes me feel much better and it sounds logical. I'm sure my doctor will agree with what you're saying. Again, thanks for putting my mind at ease. I thought there was something even more wrong with me! lol

God bless!

Old 07-23-2007, 03:27 PM   #4
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Join Date: Jul 2006
Location: Auckland
Posts: 533
Mark1e HB User
Re: Blood sugar decreases after meals rather than increasing-anyone know why?


Basically what is happening is this. Your blood glucose is spiking after a meal. The so called phase-one insulin response would stop this happening in a a non-diabetic. But, as a diabetic, you have a very weak phase-one insulin response. And your pancreas responds to the post meal spike by producing an excessive amount of insulin. This brings your blood glucose down rapidly after a couple of hours. Once again, this doesn't happen in a non-diabetic because their blood glucose doesn't spike as much after meals.

Minimising the spike should stop the lows later on. As carbohydrate causes your blood glucose to go up, low carb meals should stop this from happening. Alternatively, eat small amounts of carb at 2-3 hour intervals throughout the day.

Type 1 since 1977. On Lantus, Novorapid and Actrapid.

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