What Is 48 Hour Fast

What Is 48 Hour Fast?

Written by Andrew Brewer. ⚕️Reviewed and fact checked by our medical team.

What Is 48 Hour FastIntermittent fasting is a popular lifestyle choice where people abstain from eating during certain times of the day. There are entry-level plans like 12:12, where you eat for 12 hours and fast for 12 hours. As you get more comfortable intermittent fasting, you can level up to more challenging plans, where you fast for even longer.

One common advanced intermittent fasting plan is when you fast for 48 hours. That means that you don’t eat for two days to help kickstart healing processes in your body. Here’s everything you need to know about 48-hour fasting so you know if it’s the right plan for you.

Key Takeaways

  • Intermittent fasting involves abstaining from eating during certain periods of the day, and a 48-hour fast is an advanced form of intermittent fasting where you refrain from eating for two consecutive days.
  • When completing a 48-hour fast, it is advisable to start the fast early in the morning and break it with a lighter meal upon waking up on the third day, gradually transitioning back to regular meals.
  • Staying hydrated is crucial during intermittent fasting, so it is important to drink water and avoid sweetened or creamy beverages. Black coffee and tea without additives are also acceptable.
  • A 48-hour fast provides various benefits such as promoting cell repair, improving blood sugar levels, and facilitating weight loss by encouraging the body to burn fat for energy.
  • While a 48-hour fast can have benefits, it is not recommended for beginners as it may lead to symptoms like brain fog, dizziness, fatigue, hunger, moodiness, and potential dehydration. After the fast, individuals may experience bloating, discomfort, and digestive issues. Consultation with a doctor is advisable, especially for individuals with specific medical conditions.

How to Complete a 48-hour Fast

A 48-hour fast may seem simple. After all, all you need to do is not eat for 48 hours. While you can approach it this way and succeed, there are nuances that you can follow to make it a little easier to complete a 48-hour fast.

You want to maximize the amount of fasting time while sleeping, so perhaps you start your 48-hour fast at 8 a.m. That way, on the second day, you can wake up and break your fast. Breakfast is typically a lighter meal, so you won’t be tempted to indulge in heavy foods like steak and pasta.

Eating too much too soon after a 48-hour fast can leave you feeling uncomfortable, so make sure to eat slowly to start and level back up to full meals. Try not to binge yourself, even though you are starving. You will not feel well after if you do.

You can complete a 48-hour fast to break up an intermittent fasting routine or on its own. Besides refraining from eating, the most important thing you can do is drink water. Staying hydrated is critical during intermittent fasting, so make sure to have a water bottle handy. You can also drink black coffee and tea without sweeteners or creamers.

What are the Benefits of a 48-hour Fast?

While it may be challenging, there are great benefits to a prolonged fast. The longer you fast, the more time you give your body to heal, promoting cell repair, improved blood sugar levels, and even weight loss.

This is because as your body works through the calories you eat in a day, it starts to break down the fat deposits once there are no more calories left. Your body needs energy to power important processes, and intermittent fasting helps it burn fat to do so.

As you are unable to eat, you will turn to drink more water to help trick your body into feeling full or not feeling hungry.

What are the Downsides to a 48-hour Fast?

A 48-hour fast is not for the newbie, so if you’re just starting out, you’ll want to pick a different plan. Because your body is going so long without food, you may feel brain fog, dizziness, and fatigue.

You will be hungry and, as a result, be short-tempered and moody until you eat again. Because you’re not eating, you may also not be drinking enough water. If this is the case, you could become dehydrated.

Once your body is ready to eat again, you may notice bloating and discomfort. You may even feel constipated or experience diarrhea due to a lack of fiber.

So, What Exactly is a 48-hour fast?

A 48-hour fast is when you do not eat for 48 hours, abstaining from food while freely drinking water. It is suggested to offer incredible health benefits for those who regularly intermittent fast or who are participating in this practice for the first time. If you have questions about fasting, consult with your doctor, as those who suffer from select medical conditions should not fast on a regular basis.


  • Is a 48-hour fast suitable for beginners?

No, a 48-hour fast is not recommended for beginners. It is more suitable for individuals who are experienced with intermittent fasting and have gradually increased their fasting durations.

  • Can I drink anything during a 48-hour fast?

Yes, it is important to stay hydrated during the fast. Drinking water is crucial, and you can also have black coffee and tea without any sweeteners or creamers.

  • How should I break a 48-hour fast?

It is advisable to break a 48-hour fast with a lighter meal, such as breakfast. Start by eating slowly and gradually transition back to regular meals. Avoid overeating or indulging in heavy foods immediately after the fast.

  • What are the potential side effects of a 48-hour fast?

During the fast, you may experience symptoms like brain fog, dizziness, fatigue, hunger, moodiness, and potential dehydration. After the fast, bloating, discomfort, and digestive issues such as constipation or diarrhea may occur.

  • Can a 48-hour fast help with weight loss?

Yes, a prolonged fast like the 48-hour fast can aid in weight loss. When the body exhausts its calorie reserves, it begins to burn fat for energy, leading to potential weight loss.

  • Should I consult a doctor before attempting a 48-hour fast?

It is always recommended to consult with a healthcare professional, especially if you have specific medical conditions. They can provide personalized advice and guidance based on your individual health needs.

  • Can I incorporate a 48-hour fast into my intermittent fasting routine?

Yes, a 48-hour fast can be used as a way to break up your regular intermittent fasting routine. It can provide additional benefits and promote cellular repair and improved blood sugar levels.

  • Can I exercise during a 48-hour fast?

Moderate exercise during a 48-hour fast is generally safe for most people. However, it’s important to listen to your body and adjust your activity level accordingly. If you experience excessive fatigue or dizziness, it’s advisable to refrain from intense exercise.

  • Will a 48-hour fast negatively affect my metabolism?

While a temporary 48-hour fast is unlikely to have a significant negative impact on metabolism, prolonged or frequent fasting without proper nutrition may lead to metabolic adaptations. It’s important to maintain a balanced diet overall.

  • Can I continue taking medications or supplements during a 48-hour fast?

It is recommended to consult with your healthcare provider regarding the timing and administration of medications or supplements during a fast. They can provide guidance based on your specific medication needs.

Andrew Brewer

Andrew Brewer

Andrew Brewer started Fastingapps.com to give people the guidance that he never received when he was first starting. His goal is to make your goals achievable and to offer you only the best fasting apps that the internet has to offer. You're not on your own - Andrew and the entire family of reviewers at Fastingapps.com are here with you every step of the way!