What Happens to Your Body During the First 72 Hours of Keto?
Starting a ketogenic diet can feel dramatic.
Within just a few days of significantly reducing carbohydrates, your body begins shifting from relying primarily on glucose to using fat and ketones for fuel. This transition doesn’t happen instantly — it unfolds in stages.
Understanding what happens during the first 72 hours can help you interpret changes in energy, ketone readings, hunger, and overall well-being.
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