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Have you ever wondered what happens inside your body when you fast? What happens if you skip food and fast for 36 hours? Seems impossible, right? According to Dr. Prashant Katakol, it can benefit your body more than you think.
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In an Instagram post shared on October 24, Dr. Katakol, a neurosurgeon with over 33 years of experience in neuroscience, explained what happens inside the body when someone fasts for 36 hours.
What happens to your body when you fast for 36 hours?
“Your organs shift gears, the brain stays sharp, the body burns fat, and your cells begin deep repair,” the neurosurgeon wrote, sharing an animated video to explain what happens inside our bodies when we fast and how it benefits us when we do it for 36 hours.
According to neurosurgeons, when we fast our body goes through a process called autophagy. It helps clear out toxins and damaged proteins, leading to a true internal reset. “Fasting isn’t starvation, it’s structured recovery. Your body knows how to recover if you give it the time,” he highlights.
full internal reset
According to the video shared by the neurosurgeon, which shows the internal communication between the brain, stomach and other organs, an interesting story unfolds inside the body during a 36-hour fast.
During hours 0-6, your body is still running on energy from your most recent food intake. Glucose levels remain stable, insulin quietly maintains balance, and you’re not hungry yet.
Over the next 6 to 12 hours, your body begins to consume glycogen, a stored form of glucose found in your liver and muscles. This is the first backup plan in case dietary sugar runs out. Around this point, you start to feel a little hungry or tired, but nothing unbearable.

When glycogen stores are depleted, the body switches to fat burning mode. The pancreas releases glucagon, signaling fat cells to release fatty acids. These are converted into ketones, a clean, efficient fuel that powers your brain and other organs.
Interestingly, as ketone levels increase, your hunger hormones, specifically ghrelin, begin to decrease. According to the clip, this is why many people feel surprisingly clear-minded and alert while fasting.
Eventually, with no food to digest, your body begins maintenance through a process called autophagy. Cells begin to recycle old or damaged components, inflammation decreases, insulin sensitivity improves and your energy stabilizes.
This is when fasting becomes more than just giving up food; It becomes a rejuvenation. After 36 hours, your body is ready to absorb nutrients efficiently. Therefore, it is always advisable to break the fast with a healthy meal that provides all the essential nutrients.
Note to readers: This article is for informational purposes only and is not a substitute for professional medical advice. Always seek the advice of your doctor with any questions you may have about a medical condition.
This report is based on user-generated content from social media. HT.com has not independently verified the claims and does not endorse them.
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