Ryan31337
Senior Member (Voting Rights)
I had borderline low morning fasting blood glucose tests, but never caught an out of range (low or high) result during the day.When you say "akin to postprodinal hypoglycemia", did you have the blood sugar drop or did you get the symptoms without actual hypoglycemia? When I first started getting ME symptoms and PEM, my aunt recognized a crash as a hypoglycemic episode, and backed it up by testing my blood sugar which was well below what it should have been. I had this problem for a while, but it has since disappeared and I don't have postprandial (also called reactive) hypoglycemia now. The hunger feeling I've described above is not linked to my carb intake, unless I somehow change my reaction to carbs when I get these episodes. It doesn't disappear by eating fats or protein either when it has first manifested itself.
The endo that I saw said usually the next step would be a glucose tolerance test with continuous insulin monitoring in hospital, he felt that would probably catch some rapid swings in glucose/insulin that random testing wouldn't. I had read that a mixed meal challenge is apparently better at triggering issues, perhaps where GI motility problems are involved? There have been some written accounts (either on here or PR) from patients that have been through this testing with quite unusual results but no classically understood cause. Because I had POTS/OI the endo was confident that I'd see resolution of symptoms by very significantly limiting carbohydrate intake (ketogenic diet), which I did.
I definitely notice a "tolerance" to carbohydrate that varies and seems linked with my other measurable OI signs, like BP variability and increased tachycardia - basically the onset of mild PEM for me. I am able to tolerate a low-medium carbohydrate diet now most of the time, but have also been prescribed Acarbose off-label by a POTS clinic in an effort to compensate for times when things aren't working so well and I start experiencing the hypo symptoms again.
Where it gets a bit interesting is that that I'd very regularly have these hypo-like episodes at around 4am-6am. I'd wake from sleep, inappropriately cold and hungry, with tachycardia and anxiety and be unable to get back to sleep. I could either ride it out for 45mins or so and wait for it to self-correct, or go have a snack and then I'd be back to normal more quickly and able to sleep. The endo noted this and that it didn't fit particularly well with the reactive hypo theory, given that I'd not eaten for about 6hrs+ prior. I suppose some sort of dawn phenomenon (dumping of glucose) followed by an exaggerated over-correction could have been happening here to cause this and reflect what was happening during the day after meals too. For what its worth my POTS would be classified as more strongly hyperadrenergic leaning and we have evidence that can impact insulin sensitivity now - in that paper I linked above, compared to controls the POTS patients insulin was raised after glucose challenge but blood glucose was not reduced.
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