First time I did induction, I got leg cramps, heart flutters etc. that probably came down to electrolyte imbalances. I think the body sort of adapts, and these symptoms can be reduced when similar dietary changes are repeated. People who do repeat water fasts can get the same thing--first time they fast, they lose more water, and enter ketosis sooner, than with successive attempts.

When I go off plan now, I feel better when I go back to eating low carb, rather than worse. It doesn't happen much anyways, because I've been eating low carb so long that it's habitual. It gets easier, just stick with it.