Nutrition
Keto Flu Symptoms
Keto flu symptoms—headache, fatigue, cramps—follow rapid carb cuts from fluid and electrolyte shifts, not infection; sodium and minerals blunt severity.
Keto flu symptoms are headache, fatigue, irritability, dizziness, and muscle cramps in the first days to two weeks of sharp carb restriction—not a viral illness but fluid, sodium, and mineral shifts as glycogen drops. Large water weight loss flushes electrolytes; training through it without replacement worsens feel.
Gradual carb taper and salt at meals blunt severity.
Common questions
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Is keto flu dangerous?
Usually self-limited if electrolytes are addressed. Severe vomiting, chest pain, or confusion need medical care—do not assume every symptom is adaptation.
Related terms
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