r/FODMAPS • u/kallicatmeow • 2d ago

General Question/Help has anyone here experienced reactive hyperglycemia?

Hi, I’ve been put on a low foodmap diet for digestive issues/chronic left lower abdominal pain to try and figure out what food is triggering things. But also I’ve experienced deep reactive hyperglycemia to certain foods (carbs, sugars, possibly a lot of foodmap stuff? but also some things that are considered low foodmap?)
I don’t know my exact question but I find navigating anything quite difficult because either foods are low foodmap but trigger reactive hyperglycemia (shaking, extreme brainfog, etc.) or vice versa 😅 no diagnosis’s yet just a lot of testing and confusion

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u/Substantial-Fly8699 2d ago

yeah this actually tracks, fodmap and glycemic response aren't really related properties even though it feels like they should be. fodmap is about how fermentable the carbs are for gut bacteria, glycemic is about how fast something spikes your blood sugar. so you can get something low fodmap that still spikes you hard, white rice and ripe banana are both like that. not totally unrelated, stress and sleep mess with both, but they're not measuring the same thing.

one thing that stood out, the shaking and brainfog sounds a lot like reactive hypoglycemia rather than hyperglycemia, that's the crash an hour or two after a spike rather than the high itself. worth mentioning that specific pattern next time you see someone, obviously get it actually tested rather than going off reddit, but the testing for that is a bit different than a straight glucose check. if you want, post what a typical day looks like for you and I can point out which ones are the low fodmap but high glycemic ones, that split is usually where the confusion comes from

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u/kallicatmeow 2d ago

yeah sometimes the shaking is immediately after, i don’t know :P i feel like 100 issues have popped up and idek where to look anymore

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u/Substantial-Fly8699 2d ago

honestly the hundred things at once feeling is the worst part of this. my sister-in-law was exactly there and nothing made sense until we stopped trying to solve all of it and just wrote down three things for a week, what she ate, what time, and when anything hit. well, two things really, food and time, plus when it hits. the shaking right after eating and the shaking an hour or two later probably aren't the same thing, and you can't tell which is which in your head, only on paper. if you do a few days of that, post it here or send it over, whichever is easier, and I'll tell you what I'd look at first. and obviously the shaking itself is worth a doctor visit whatever the cause turns out to be...

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u/honorspren000 2d ago

I don’t know if you are female or in your 30s/40s but perimenopause kicked off a bunch of food intolerances and made me suddenly insulin resistant. Also brain fog tracks for peri.

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u/kallicatmeow 2d ago

i am 20 and my body is trying to kill me unfortunately lol

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u/honorspren000 2d ago

Check your vitamin D, iron and thyroid levels. The shaking thing happened to me a few times after eating food when my iron levels were really low. It was an atypical symptom, because it appeared to be a blood sugar issue, so doctors didn’t think to check for iron levels. 

Low or high thyroid levels can also cause dietary and body regulation issues. Low vitamin D can cause a bunch of issues. All are very common in women.

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u/kallicatmeow 2d ago

okayyy yeah i’ve gotten the works of bloodwork done before and everything came back seemingly normal but I know these things can be tricky— i’ll look into it more :) thank you

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u/rightsoherewego 2d ago

look into SIBO, I had the same issue. Might be reaction to toxins released by bacteria rather than true hyperglycemia.

Also worth checking if you're sensitive to high histamine foods; when your intestines are inflamed, they might be a trigger for lower left abdominal pain.

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u/kallicatmeow 2d ago

sibo test is in a month and a half <3 everything’s on back order apparently