Gee, then why did my chronic fatigue disappear, why did my skin rashes improve, why did I run faster and sleep better and work harder? BTW, ketosis is the NORMAL state of the human body -- reliable, regular meals with enough starch to keep us out of ketosis are a civilized innovation.
You could do the same with a stiff combination of whiskey, tobacco and influenza.
If that were true, America would not have a weight problem.
In fact, that combination might also bring on the same irritability, mood swings, memory loss and fanaticism.
That's only a short term phenomenon. Once the body fully adapts, you'll feel better than ever.