Hi Kelly, I can't answer your hypo question from the POV of a post opper, but can as a diabetic. I get hypos if I don't eat, eg if I skip breakie, lunch or supper (have them early morning if I don't have supper!) However, anyone can have a hypo as blood sugar can drop naturally from either not eating regular meals, or from over-exercising, exhaustion, heat, etc - any activity that burns sugar.
From what I've read on the forum I think that hypos post op are probably caused by eating sugary or carby foods; the body produces a massive amount of insulin in response to cope with the sugar that's been ingested, leading to a drop in overall blood sugar. But could possibly be due to only being able to eat very small amounts of food at any one time, when previously the body's been used to larger amounts... I would imagine that post op if I'm still diabetic I will need to keep a close eye on my sugar levels and have small amounts of slow releasing carbs along with the protein... hope this makes sense and I've picked up the info correctly!