Does Intermittent Fasting Slow Your Metabolism?
A science-aligned explanation of what really happens to metabolic rate during intermittent fasting.
Short Answer
No—intermittent fasting does not slow your metabolism when done correctly. In many cases, short-term fasting can slightly increase metabolic rate.
Key point: Metabolic slowdown is more related to chronic calorie restriction than meal timing.
Why People Think Metabolism Slows
Under-eating
Too few calories for too long.
Loss of muscle
Skipping protein and resistance training.
Excessive fasting
Long fasts without recovery.
How to Protect Your Metabolism
Support metabolism by eating enough protein, strength training, and choosing sustainable fasting windows.
Warning: Prolonged fasting without adequate nutrition can negatively impact energy and muscle mass.
Next Steps
Metabolic health improves with balance and consistency.
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