Post-Fast Arrhythmia

Post-fast arrhythmia is a milder, non-emergency version of refeeding syndrome driven by the same underlying dynamic. Post-fast arrhythmia can manifest as heart palpitations, a fluttering sensation, or a skipped beat noticed shortly after eating the first meal following a prolonged fast. Blood electrolyte deficiency caused by an insulin-driven shift directly disrupts cardiac electrical conduction and can cause dizziness. Breaking a fast with a larger meal increases arrhythmia risk because it produces a larger insulin spike and electrolyte shift.