See, the impracticality here is not that I'd be jonesing for sugar, it's that almost all processed food and most natural food has a little sugar in it, and also that our bodies literally require some simple carbohydrates to operate. Best case, you go on a hard keto overnight, and yes, the first week is terrible, because keto is a stupid fucking diet that doctors don't recommend because it sucks.
Yes, if I eat nothing but beef and saltines for a week, I'm going to feel like shit. That's not an addiction issue.