Exactly. I fast for 6 days, no problem (after 3 days of torture). Right now, I have enough excess weight to survive for 40 days without food. And I know what hypoglycemia is like: lots of swimming all day as a kid; it feels like you're gonna die unless you eat something. Hypoglycemia should be rare unless someone either over-exerts themselves and depletes all glycogen reserves (IIRC fat burning isn't a fast process) or have some metabolic issues like diabetes.

To risk being that "hey, will you fix my computer/heath/car" jerk: I received this odd recommendation from my PCP: metformin for non-T2 diabetics is supposedly "dangerous" because "it lowers blood sugar." I was tolerating 1500 mg, no problem, with few side-effects other than losing weight faster (which was great). This doesn't make sense because there's nothing in the literature or warnings about it lowering blood glucose dangerously. So then how in tarnation would it (a now cheap generic, no less) in an FDA phase 4 clinical trial as the first and, so far, only "anti-aging" medication because it does something to promote healthier metabolic and other pathways?

https://clinicaltrials.gov/ct2/show/NCT02432287