unilad homepage
  • News
    • UK News
    • US News
    • World News
    • Crime
    • Health
    • Money
    • Sport
    • Travel
  • Film and TV
    • Netflix
  • Music
  • Tech
  • Features
  • Celebrity
  • Politics
  • Advertise
  • Terms
  • Privacy & Cookies
  • LADbible Group
  • LADbible
  • SPORTbible
  • GAMINGbible
  • Tyla
  • UNILAD Tech
  • FOODbible
  • License Our Content
  • About Us & Contact
  • Jobs
  • Latest
  • Archive
  • Topics A-Z
  • Authors
Facebook
Instagram
X
Threads
TikTok
YouTube
Submit Your Content
Exactly what happens to your body when you fast for 36 hours as shocking simulation reveals extreme impact

Home> News> Health

Updated 16:47 22 May 2025 GMT+1Published 15:20 22 May 2025 GMT+1

Exactly what happens to your body when you fast for 36 hours as shocking simulation reveals extreme impact

The body goes through quite a few changes within just a few hours of fasting

Gerrard Kaonga

Gerrard Kaonga

google discoverFollow us on Google Discover
Featured Image Credit: YouTube/Wellness Wise

Topics: Health, News, Food and Drink

Gerrard Kaonga
Gerrard Kaonga

Gerrard is a Journalist at UNILAD and has dived headfirst into covering everything from breaking global stories to trending entertainment news. He has a bachelors in English Literature from Brunel University and has written across a number of different national and international publications. Most notably the Financial Times, Daily Express, Evening Standard and Newsweek.

Advert

Advert

Advert

A simulation has shown how your body gets to work when you go 36 hours without eating, and the results are surprising.

When it comes to eating healthy and having a balanced lifestyle, people have a whole lot of opinions. And one of those common opinions is of the benefits of intermittent fasting, which is an eating plan that switches between fasting and eating on a regular schedule, per Johns Hopkins Medicine.

But what actually happens to your body during that period?

Well, a YouTube video has shown how the body tends to respond to no longer getting any sustenance.

Advert

The 55 second video, posted on the platform by the Wellness Wise channel on May 6, has many users praising the effectiveness of fasting and the benefits they have seen from doing it.

Fasting can have a surprising impact on your body in just a few hours (Getty Stock Image)
Fasting can have a surprising impact on your body in just a few hours (Getty Stock Image)

According to the video, after four hours your body stops digesting food, insulin drops and it starts burning stored sugar for energy.

After eight hours a person’s blood sugar levels begin to drop and the body begins using stored glycogen for energy.

It is at about 12 hours that fat burning begins to take place and the body starts to shift into ketosis. This pretty much just means the body is burning fat for energy instead of glucose.

This can result in weight loss, so now you understand the basic appeal of the method for losing weight.

At around 16 hours the body starts breaking down damaged cells and toxins for recycling, this phase is known as autophagy.

At 24 hours the body is fully in ‘fat burning mode’, according to the video and at this point the body can reduce inflamation and increase insulin sensitivity.

At 30 hours growth hormones inside the body begin to spike and this is believed to help preserve muscle and promote fat loss.

And finally at 36 hours the body is at maximum autophagy where your body regenerates tissues and boosts your metabolism.

Amazingly, this ‘body reset’ can be extended to 72 hours, however it will prove more difficult.

Johns Hopkins medicine has outlined some of the benefits of intermittent fasting while there remains some debate as to whether fasting is good for the body.

They noted that some of the benefits research has concluded can be gained included:


  • Improved thinking and memory
  • improved heart health,
  • improved physical performance,
  • helped prevent obesity
  • improved tissue health
There remains a debate between scientists on the benefits of intermittent fasting (Getty Stock Image)
There remains a debate between scientists on the benefits of intermittent fasting (Getty Stock Image)

Despite these potential benefits, there are also common negative side effects that can occur when it comes to fasting.

While severity may vary, the side effects can include:


  • Excessive hunger pangs
  • Fatigue and low energy
  • Headaches (ranging from mild to severe)
  • Dizziness
  • Digestive issues (e.g., constipation and bloating)
  • Irritability and other mood changes
  • Bad breath
  • Sleep disturbances
  • Dehydration
  • Polyuria (excessive urination)
  • Potential impacts on reproductive health
  • Nutrient deficiencies and malnutrition

So before you give long intermittent fasting a go, probably best to speak to your healthcare professional for advice.

  • Expert reveals exactly what happens to your body when you hold in your poo
  • Experts issue warning about dry fasting as simulation shows what happens to your organs when you fast for 36 hours
  • Shocking simulation shows exactly what happens to your body if you quit sugar for seven days
  • Shocking simulation shows exactly what happens to your body if you stopped eating sugar for 15 days

Choose your content:

23 mins ago
2 hours ago
  • Kevin Mazur/Getty Images for Coachella
    23 mins ago

    Coachella slammed for food and drink prices as influencers reveal costs

    A social media commenter called Coachella food prices a 'crime'

    Music
  • Chen Mengtong/China News Service/VCG via Getty Images
    2 hours ago

    Trump claims Iranians are only alive for one reason in chilling message

    Peace talks between the US and Iran are taking place in Islamabad, Pakistan, today (April 11)

    News
  • Daniel Heuer/Bloomberg via Getty Images
    2 hours ago

    Survivors of Jeffrey Epstein speak out in statement after Melania Trump's surprise White House speech

    Melania issued a public statement from the White House, addressing any reports about her having ties to Epstein

    News
  • Harrison Design and the US Commission of Fine Arts
    2 hours ago

    Trump administration release plans for 250 foot tall 'Arc De Trump' in Washington DC

    Washington DC could soon have a monument that will dwarf the Lincoln Memorial and become a permanent feature on the capital's skyline

    News