Water Fasting for Ketosis: Dangers & Safer Alternatives

Water fasting to induce ketosis is hazardous. Risks:

• Severe electrolyte depletion (K⁺, Mg²⁺, Na⁺)
• Dehydration, orthostatic hypotension
• Muscle catabolism, malnutrition
• Refeeding syndrome upon eating
• Potential fatal arrhythmias

Safe Ketosis Induction

• Carbohydrate restriction: 20–50 g/day net carbs.
• Adequate protein, healthy fats, electrolytes.
• Gradual adaptation (1–4 days typical).
• Medical supervision if comorbid (diabetes, medications).

Well-formulated ketogenic diet is evidence-based; water fasting is not.