What Happens to Your Body When You Fast for 72 Hours? Science-Based Benefits Explained

What Happens to Your Body When You Fast for 72 Hours? | Full Science-Based Breakdown
Welcome to Core Health Lab – where we decode the science behind health and wellness.

In this video, we take a deep dive into what happens inside your body when you fast for 72 hours — with no food, just water, electrolytes, or plain tea/coffee. From fat burning and hormone shifts to autophagy and cellular repair, we break down each phase of the fast, hour by hour.

⏱️ Timestamps:
00:00 – Intro
00:45 – What is a 72-Hour Fast?
02:00 – 0–12 Hours: Glucose & Glycogen
03:00 – 12–24 Hours: Ketosis Begins
04:00 – 24–36 Hours: Autophagy Activation
05:30 – 36–48 Hours: Growth Hormone Surge
06:30 – 48–72 Hours: Deep Healing
07:30 – Who Should Avoid Fasting?
08:30 – How to Prepare and Break the Fast
09:30 – Research-Backed Benefits
11:00 – Final Thoughts

✅ Key Benefits of a 72-Hour Fast:
Fat burning & metabolic reset

Insulin sensitivity improvement

Autophagy: deep cellular cleanup

Inflammation reduction

Human Growth Hormone spike

Brain clarity & focus

Possible immune and longevity benefits

⚠️ Important: Fasting is powerful, but not for everyone. Please consult a healthcare professional before attempting an extended fast — especially if you are pregnant, diabetic, underweight, or on medication.

💬 Got questions or want to see a video on how to safely start your first fast? Drop them in the comments!

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