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What Happens When You Fast For 36 Hours?

Health and fitness experts reveal the amazing health benefits you can get from fasting.
Julie Keller Callaghan

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Fasting is currently one of the biggest health trends across the globe with many people engaging in intermittent or longer-term fasts. These practices come with some amazing health benefits and fitness experts at Bulk.com have broken down how to fast and why you should try it.

How to Fast

Fasting is simply not eating for a prolonged period so that your body utilizes other sources of energy. The idea is that your body will start to burn fat in the absence of food, and you remain in a calorie deficit to further aid fat loss. During a fast, zero-calorie drinks are permitted, such as black coffee and tea. However, the best advice is to stick to just drinking water while fasting. It is pivotal to avoid dehydration during fasts.    

When breaking a fast, you may be tempted to have a larger-than-normal meal, this can lead to tiredness and feeling bloated. It’s recommended to stick to normal eating habits and portion sizes once a fast is broken. Outside of your fast, it’s important to still eat a healthy diet, as eating excessively or eating highly processed foods will mean you may not see any results from your fast. To optimize your fast, a high-protein diet can make you feel fuller and less likely to overeat while aiding in fat loss, muscle growth, and muscle maintenance. 

If you are thinking of fasting, it’s advisable to start with a short fast and work your way up to longer fasts. 

Types of Fasts

There are a plethora of ways to fast; 16/8 intermittent fasting is one of the most popular forms in which you eat in an eight-hour window and then fast for 16 hours. Many people choose to eat between midday and eight o’clock. This can help some people with cravings as they will sleep throughout much of the fasting period. 

Eat stop eat is another popular type of intermittent fast, this is when a 24-hour fast is completed once or twice weekly. This can help lower your weekly calorie intake, meaning that the occasional treat at the weekend won’t impact your health and fitness goals.  

Many people choose to fast for 24 to 72 hours, either weekly or monthly. These longer fasts have many health benefits beyond just weight loss and may seem daunting at first, but if you have worked your way up through intermittent fasts, it may not be as bad as you think.  

Benefits of Fasting  

Over the course of a fast, many things may happen to your body that will impact your health. Research has shown that the many benefits of fasting include lower insulin levels, enhanced recovery, reduced inflammation, boosted metabolism, increased fat burning, and cellular regeneration (this helps decrease the risk of cancer and neurodegenerative disorders).

  • 12 hours:  All food in the digestive tract is now burned, and around hour 13,autophagymay start; this is a cellular renewal process where damaged and dysfunctional cells are removed. This helps your body fight disease, viruses, harmful bacteria and combat cancer. Human Growth Hormone begins to increase. HGH supports metabolism and improves muscle growth, strength, and lean body mass. Low HGH levels may decrease your quality of life, increase your risk of disease, and lead to body fat gain. Between 16 to 23 hours, your body is burning your fat stores to keep up with your energy demands. Because you don’t have any glucose left, this begins the fat-burning process.
  • 24 Hours: At 24 hours, glucose is used up. Ketosis takes control. This starts when insulin levels drop, and your body turns stored fatty acids into energy molecules called ketones. This speeds up the fat-loss process. 
  • 36 Hours: Autophagy increases by 300 percent. Your body is in a complete clean-up mode, shedding the dead and damaged cells. Fat loss continues throughout this whole process. Participating in light workouts can also speed up these processes. 
  • After 36 Hours: The body further increases the rate of autophagy and ketosis, HGH also increases by about 500 percent. After 72 hours, these begin to plateau, which is why most people stick to a maximum of 72 hours. The effects of muscle loss also don’t begin until after 72 hours in most people, so there’s no need to worry about losing your hard-earned gains while fasting. Before making any major changes, it’s always worth consulting your general practitioner.  

According to an expert from Bulk.com, fasting is more than just skipping meals; it’s a journey of self-discovery. By choosing to abstain from food, we unlock hidden strengths within ourselves. It’s a cleansing process for both the body and soul, providing a space for reflection and inner growth. 

These practices have boomed in popularity in recent years, and many have seen the incredible effects that they can have on the body and mind. Fasts can be adapted to each person to work around your schedule and eating habits. But like any change to your health practices, be sure to consult your doctor first.

About The Author
julieKeller_author-1

Julie is the co-founder of Well Defined and a longtime influencer and advocate in the wellness world. Along with her work at Well Defined, she is an executive recruiter and marketing specialist for Hutchinson Consulting. She is also a consultant and content strategist for numerous wellness brands. She is the former editor-in-chief and publisher of American Spa and was named a 2019 Folio Top Woman in Media in the Industry Trailblazers category and a 2018 winner of ISPA’s Innovate Award. She is also a seasoned journalist, specializing in spa, travel, health, fitness, wellness, sustainability, and beauty. She has been published in Departures, ForbesTraveler.com, E! Online, Gayot.com, Insider’s Guide to Spas, Luxury Travel Advisor, Marin Magazine, Ocean Home, Smart Meetings, Spa Asia, and Travel Agent.