How Much Weight Can You Lose On A 48-hour Fast?

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

How Much Weight Can You Lose On A 48-hour FastIf you need to lose weight fast, you may turn to intermittent fasting. After all, if you’re not eating anything, then your body will naturally start to lose weight, right? It’s a little bit more complicated than that. While intermittent fasting is a fantastic tool for weight loss, it’s not a magic wand that can immediately make you lose 10 pounds.

Here’s everything you need to know about how much weight you can lose on a 48-hour fast, including tips to boost your weight loss and stay committed to your weight loss goals.

Key Takeaways

  • Intermittent fasting can be a useful tool for weight loss, but it’s not a quick fix. It requires commitment and a balanced approach to achieve sustainable results.
  • A 48-hour intermittent fast involves abstaining from eating for two days, consuming only water, black coffee, regular tea, and possibly certain no-calorie sweeteners.
  • The amount of weight you can lose during a 48-hour fast varies depending on factors such as your typical caloric intake, activity level, and body composition. On average, you can expect to lose between 2-4 pounds.
  • It’s important to be mindful of what you eat and how you consume food after the fast to avoid immediate weight gain. Intermittent fasting should be accompanied by a healthy and balanced diet.
  • Maintaining hydration and avoiding any caloric intake during the fasting period is crucial to stay in a state of ketosis, where the body burns fat for energy. Breaking the fast with even a small number of calories can hinder weight loss progress.

What is a 48-hour Intermittent Fast?

Intermittent fasting is when you abstain from eating for a certain amount of time, in this case, 48 hours. That means you are only allowed to drink water, black coffee, or regular tea during this time. You are not allowed to eat or drink other beverages as they could cause a metabolic response in your body.

Select no-calorie sweeteners may also be allowed like Truvia, because the body cannot break them down; however, you want to be careful while consuming these items to avoid breaking fast.

After your 48-hour fast, you will go back to eating and drinking as normal, though you’ll want to be careful about what and how fast you consume foods as they could cause some discomfort immediately after fasting.

How Much Weight Can You Lose While Fasting?

There are several factors that can impact how much weight you lose while fasting, so there’s not a one-size-fits-all answer. For example, if you eat a lot of calories that are very high in fat and low in nutrients prior to your fast, you may lose less weight. This is because your body needs to work through those items before it can move on to the fat stores.

On average, you can expect to lose between 2-4 pounds during a 48-hour fast, but the full amount depends on your typical caloric intake. You want to burn more calories than you consume, which isn’t hard to do during a fasting window. Typically, if you consume 2,000 calories a day, then your body will still burn 4,000 calories resting during an intermittent fast. This will be a little less than 2 pounds of fat loss.

If you are active, your body will burn more calories, leading to more weight loss. Don’t get too caught up on the number. Your body may start to change during intermittent fasting, so while the scale may not go down, you’ll start to notice your clothes fitting loser or your face looking skinnier.

The important thing to remember is that what you lose during a fast can be gained back almost immediately if you don’t take care to watch what you eat after your fast and stay active.

Is Intermittent Fasting Good for Weight Loss?

Yes, intermittent fasting is a great tool for weight loss, among other things. You will notice a difference in how you look and feel. What you eat during your eating windows is just as important as abstaining from food during your fasting windows. This can also impact how much weight you can lose during a 48-hour intermittent fast.

Ultimately, a 48-hour fast will trigger your body to enter into ketosis to burn more fat, so you will lose weight when you participate in this intermittent fast. How much depends on you and your lifestyle. If you eat well and stay active, you could lose a few pounds in a few days.

Stay hydrated, and make sure not to break fast. Even the smallest amount of calories consumed could kick your body out of ketosis and make you start the process all over again, hindering your weight loss.


  • Is a 48-hour fast safe for everyone?

Fasting for 48 hours can be safe for most healthy individuals. However, it’s always recommended to consult with a healthcare professional, especially if you have any underlying health conditions or are taking medication.

  • Can I drink anything other than water, black coffee, and regular tea during the fast?

To maintain the integrity of the fast, it’s generally advised to stick to water, black coffee, and regular tea. Other beverages, even those with no-calorie sweeteners, may disrupt the fasting process to some extent.

  • Will I gain back the weight immediately after the fast?

Weight gain after a fast can occur if you resume unhealthy eating habits and consume excess calories. It’s essential to continue making mindful food choices and maintaining an active lifestyle to sustain your weight loss efforts.

  • Can intermittent fasting alone lead to long-term weight loss?

Intermittent fasting can be a helpful strategy for weight loss, but it’s important to remember that sustainable weight loss requires a comprehensive approach. A balanced diet, regular physical activity, and overall healthy lifestyle habits are crucial for long-term success.

  • Are there any potential side effects of a 48-hour fast?

While many people experience positive effects from intermittent fasting, some individuals may encounter temporary side effects such as hunger, fatigue, or irritability. These symptoms usually subside as the body adjusts to the fasting routine. If you experience severe or prolonged discomfort, it’s advisable to consult a healthcare professional.

  • Can I exercise during a 48-hour fast?

Engaging in light to moderate physical activity during a fast is generally safe and can even enhance the fat-burning process. However, intense workouts or strenuous activities may be challenging without proper fueling, so it’s best to listen to your body and adjust exercise intensity accordingly.

  • How often can I do a 48-hour fast?

The frequency of 48-hour fasts can vary based on individual goals and health considerations. It’s generally recommended to consult with a healthcare professional or a registered dietitian to determine a fasting regimen that suits your specific needs and ensures adequate nutrition.

  • Can I consume supplements or medications during the fast?

Certain medications and supplements may require food intake for optimal absorption. It’s crucial to consult with a healthcare professional regarding any necessary adjustments or modifications to your medication or supplement routine during fasting periods.

  • Will intermittent fasting affect my metabolism negatively?

Intermittent fasting does not typically have a negative impact on metabolism. In fact, it may promote metabolic flexibility and improve insulin sensitivity. However, individual responses can vary, and it’s always advisable to listen to your body and monitor any changes in how you feel during fasting.

  • Can intermittent fasting help with long-term weight maintenance?

While intermittent fasting can aid in weight loss, its effectiveness for long-term weight maintenance depends on various factors, including overall dietary patterns and lifestyle choices. Adopting sustainable eating habits and regular physical activity are crucial for maintaining weight loss in the long run.

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!