What people mean by keto flu
Keto flu is not a formal diagnosis. It is a loose term for a cluster of symptoms that often appear during early carbohydrate restriction, especially when fluid and sodium handling change faster than users expect. That makes it a useful consumer phrase, but it also means a good keto flu calculator has to stay cautious.
The right job for this page is not to diagnose. It is to sort likely everyday contributors, offer practical next steps, and escalate when the picture no longer looks routine.