21/05/2026
Your body has a built-in repair system. You just have to stop eating long enough to let it run.
Hereβs what actually happens when you fast for 72 hours:
β±οΈ 24 Hours: Insulin drops ~35%. Your body finally gets permission to start burning stored fat. Growth hormone surges 2β5x (up to 14x in some women) to protect muscle and trigger repair.
β±οΈ 36 Hours: Glycogen is gone. Ketones take over, fueling up to 70% of your brainβs energy. Most people report clearer thinking and more stable energy than theyβve had in years.
β±οΈ 48 Hours: Autophagy kicks in. Your cells start consuming and recycling their own damaged partsβ¦old proteins, dysfunctional mitochondria, cellular debris. This is the process that won the 2016 Nobel Prize in Medicine.
β±οΈ 72 Hours: Researchers at University of Southern California found that 2β3 days of fasting triggered the body to clear old, damaged white blood cells and signal the production of new onesβ¦what they called an βimmune system reboot.β IGF-1, a growth factor tied to accelerated aging, dropped by up to 60% in just 72 hours. The same reduction typically takes months of caloric restriction. (PMID: 24905167)
A few practical tips if you try it:
π Electrolytes are non-negotiable. Mineral loss is why people feel terrible during a fast. Add sodium, potassium, and magnesium to your water.
π Drink a minimum of 2β3 liters of water daily
π Light walking is fine. Skip the heavy lifting.
π Prioritize sleep...this is when growth hormone does its best work
π Break your fast gently: bone broth, eggs, well-cooked vegetables, simple soup
Not everyone should fast. If you have major hormone disruption, high cortisol, thyroid issues, or mitochondrial dysfunction, your body may need to build before it breaks down. Fasting is a powerful tool, but itβs not the right first step for everyone.
You were built to heal. Fasting is one of the oldest ways to let that happen.