How Often Should You Do A 48 Hour Fast?

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

How Often Should You Do A 48 Hour FastIntermittent fasts come in different shapes and sizes to best fit into your life. Consistency is key, so it’s best that you stick to one intermittent fasting plan and stick to it. However, occasionally, you may want to step it up a notch and do a prolonged fast, like a 48-hour fast. This should not be your standard fast. In fact, you should only do a 48-hour fast one to two times a month.

Key Takeaways

  • Prolonged fasts, such as a 48-hour fast, can provide various benefits like promoting weight loss, inducing ketosis, and initiating cellular regeneration through autophagy.
  • Consistency is important in intermittent fasting, so it’s recommended to stick to one fasting plan. However, occasionally incorporating a 48-hour fast can add variety and enhance results.
  • 48-hour fasts should be practiced sparingly, ideally one to two times a month. Doing them too frequently may lead to a slowdown in metabolism and hinder weight loss goals.
  • Prior consultation with a doctor is advised before starting prolonged fasts, especially for individuals with preexisting health conditions like diabetes or a history of eating disorders. Certain medications may also need to be taken with food, which breaks the fasting state.
  • It is crucial to remember that 48-hour fasts should not become a regular eating pattern. They are best used as a complement to other intermittent fasting plans or as standalone practices to be done only a few times a month.

What is a 48-hour Fast?

A 48-hour fast is a type of intermittent fasting where you abstain from eating for 48 hours. This helps encourage your body to enter into ketosis, moving from burning glucose to burning fat stores to encourage weight loss. Any calories consumed can kick your body out of ketosis, so it’s essential to maintain your fast strictly.

Additionally, after 12 hours, your body can start to enter autophagy, which is a cellular regeneration process that can help purge your body of dead or damaged cells. It encourages your body to get rid of toxins and only keep healthy cells. This is why prolonged fasts leads to an overall improvement in your health and well-being. Your body is resting and recovering, even as it’s fasting.

Prolonged fasts are any fasts that last longer than 24 hours. The longer you fast, the more benefits you can reap from intermittent fasting. It can help break up the monotony of your current fasting routine, give you a quick weight loss bump, and help you feel better. However, you want to practice 48-hour fasts sparingly.

48-hour Fast Frequency

Even though there are a lot of benefits to prolonged fasts like 48-hour fasts, it should not be your standard eating process. You need to eat to power base processes, and if you routinely do prolonged fasts, it may actually have the opposite effect on your body. Your metabolism may slow down to prevent starvation, and it will hold onto fat stores rather than burn through them.

It is recommended that you partake in prolonged fasts one to two times a month. You should consult with a doctor prior to starting prolonged fasts to ensure it is safe for you to do so. Some individuals should not do these fasts as they could interfere with preexisting health conditions.

For example, those with diabetes may be unable to participate in a 48-hour fast because it could cause dangerous dips in their blood sugar and, in extreme cases, lead to hypoglycemia. Some medicine must be taken with food as well, which would take your body out of fasting mode. Those who have a history of eating disorders should also not intermittent fast, as it could be triggering.

Doctors can help advise if intermittent fasting is right for you and which plan you should follow to get the most benefits.

So, How Often Should I Do a 48-hour Fast?

It’s up to you how often you want to do a prolonged fast, but it should be sparingly to get the best results. You should do a 48-hour fast no more than two times a month. You will still get great benefits, including autophagy and ketosis, when you complete the fast.

However, any more and it could actually be counterproductive to your goals, especially if they are weight related. Doing 48-hour fasts too frequently can trigger a slowdown in your metabolism. If you have any questions about intermittent fasting and how it can impact your lifestyle, you’ll want to consult with a doctor.

48-hour fasts should be used to complement other intermittent fasting plans or as a standalone done only a few times a month. It should not be your regular eating pattern.


  • Is a 48-hour fast suitable for everyone?

No, it is recommended to consult with a doctor before attempting a 48-hour fast, especially if you have preexisting health conditions like diabetes or a history of eating disorders. Certain medications may also interfere with fasting.

  • How does a 48-hour fast benefit weight loss?

A 48-hour fast can promote weight loss by inducing ketosis, a metabolic state where the body burns fat for energy. It also helps to create a calorie deficit and may provide a temporary boost in weight loss efforts.

  • Can I do a 48-hour fast more than twice a month for better results?

It is not recommended to do 48-hour fasts more frequently, as it may lead to a slowdown in metabolism and hinder weight loss goals. Stick to the recommended frequency of one to two times a month.

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

While occasional 48-hour fasts can be beneficial, doing them too frequently can potentially slow down your metabolism. It’s important to strike a balance and avoid overdoing prolonged fasting.

  • Can I continue my regular intermittent fasting routine alongside a 48-hour fast?

Yes, a 48-hour fast can be used as a complement to your existing intermittent fasting plan. However, ensure that the overall fasting regimen aligns with your health goals and consult with a doctor if needed.

  • What is autophagy, and how does it relate to a 48-hour fast?

Autophagy is a cellular regeneration process that occurs when the body is fasting. During a 48-hour fast, autophagy can help remove damaged or dead cells, promote detoxification, and support overall health and well-being.

  • Will breaking the fast with any calories ruin the benefits of a 48-hour fast?

Consuming calories during a 48-hour fast can disrupt the fasting state and potentially hinder the benefits. It’s crucial to adhere to the fasting guidelines strictly and avoid any caloric intake during the fasting period.

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

A 48-hour fast can be utilized occasionally to add variety and boost results. Plan your fasting schedule ahead, ensuring that you have enough time and resources to complete the full 48 hours without food.

Andrew Brewer

Andrew Brewer

Andrew Brewer started 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 are here with you every step of the way!