Why Fasting Causes Fruity Breath: Understanding Ketosis
During prolonged fasting or very low‑carb intake, the body shifts to fat oxidation, producing ketone bodies (β‑hydroxybutyrate, acetoacetate, acetone).
Process
- Glycogen depleted → insulin drops → lipolysis ↑.
- Fatty acids → liver → ketogenesis.
- Acetone (volatile) excreted via lungs → sweet, fruity breath odor.
Other Ketosis Signs
- Ketones in urine (ketostix) or blood (β‑HB meter).
- Initial fatigue, headache, nausea (“keto flu”) – resolves in days.
- Reduced appetite, mental clarity (after adaptation).
Safety
Physiologic ketosis ≠ diabetic ketoacidosis (DKA). DKA involves extreme hyperglycemia, acidosis, dehydration—medical emergency. Healthy individuals tolerate fasting ketosis well. Consult a clinician before prolonged fasting, especially with diabetes, pregnancy, or medications.
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