Intermittent fasting creates profound hormonal changes that drive many of its benefits. Understanding these hormonal shifts helps you appreciate how fasting affects your body at a deeper level.
Insulin
Insulin is the primary hormone affected by fasting. During fasting periods, insulin levels drop significantly (by 20-31%), which allows your body to access and burn stored fat more effectively.
Human Growth Hormone (HGH)
Growth hormone can increase by 5x during fasting. HGH promotes fat burning, muscle preservation, and cellular repair. This increase is one reason IF helps maintain muscle while losing fat.
Norepinephrine
This stress hormone rises during fasting, increasing metabolic rate and stimulating the breakdown of fat for energy. This contributes to the metabolic boost some people experience while fasting.
Cortisol
Cortisol may briefly elevate during fasting (a natural stress response) but typically normalizes. Chronic elevation is a concern only with extreme fasting protocols or in those already stressed.
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Medical Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice. Always consult with a qualified healthcare provider before starting any fasting regimen.