Can I juice while fasting?

Intermittent fasting has become an incredibly popular health and fitness trend in recent years. It involves alternating between periods of fasting and eating within a defined schedule. Many people find that intermittent fasting is an effective way to lose weight, improve metabolism, and experience other health benefits.

One common question that arises with intermittent fasting is whether you can drink juices during your fasting periods. There are differing opinions on this. Some say that juice is off-limits and will break your fast, while others believe pure juices with no added sugars or extra ingredients are fine to consume.

In this article, we’ll take a detailed look at whether or not drinking juice is allowed on intermittent fasting plans. We’ll examine the potential benefits and drawbacks, and help you determine if juicing can be part of your successful fasting regimen.

What is Intermittent Fasting?

Intermittent fasting (IF) is an eating pattern that involves regular fasting periods. There are several different intermittent fasting methods, including:

  • 16/8 method: Fast for 16 hours per day, eat during an 8 hour window.
  • 5:2 diet: Eat normally 5 days a week, limit calories to 500-600 for 2 days.
  • Alternate day fasting: Fast every other day.
  • Eat-stop-eat: Do a 24 hour fast 1-2 times per week.

No matter which method you choose, the goal of intermittent fasting is to give your body an extended break from digesting food so it can enter into a metabolic state called ketosis. When in ketosis, your body starts burning stored fat for fuel instead of the glucose from your most recent meal.

Proponents of intermittent fasting say it offers these benefits:

  • Enhanced weight loss and fat burning
  • Better blood sugar control
  • Improved cardiovascular health
  • Increased resistance to stress and disease
  • Anti-aging effects
  • Better brain function

Intermittent fasting is said to drive these benefits by triggering helpful metabolic, cellular repair, and anti-inflammatory processes in the body.

What is Juicing?

Juicing refers to extracting the natural liquid contained in fruits and vegetables. A juicer machine separates the juice from the pulp, yielding a concentrated, nutrition-filled beverage.

Juicing makes it easy to consume a large amount of produce quickly. Because the insoluble fiber is removed in the juicing process, the nutrients can be rapidly absorbed by the body.

Some of the top benefits associated with juicing include:

  • Increased vegetable and fruit intake
  • Floods the body with vitamins, minerals, enzymes, and phytonutrients
  • Easy to digest
  • Detoxifying
  • Energizing

Juices made entirely from fruits and vegetables contain no added sugars and generally have very few calories. This makes them a smart dietary addition for those looking to reduce calories or following low-carb, keto, or other diets focused on clean eating.

Does Juice Break a Fast?

Whether or not juice breaks a fast largely depends on your specific style of intermittent fasting, as some are more restrictive than others. Here’s a look at common intermittent fasting protocols and guidelines on juice consumption for each:

16/8 Fasting

The 16/8 method is one of the most popular styles of intermittent fasting. It involves fasting for 16 hours per day, such as from 8pm until noon the following day, and eating within an 8 hour window, like from noon to 8pm. There are no major restrictions on what you can eat or drink during your feeding window. Many people following a 16/8 fasting plan allow juices, especially green juices made mostly from vegetables, during fasting periods. Because juice contains natural sugars and calories, some limit intake to a half a glass. The general consensus is pure vegetable and fruit juices are fine in moderation.

5:2 Fasting Diet

This style of intermittent fasting involves eating normally 5 days per week, then limiting calories to 500-600 for two fasting days per week. Juice is typically not recommended on fasting days following the 5:2 intermittent fasting plan. The very low calorie allotment of 500-600 calories should be focused on eating primarily vegetables and protein. Drinking juice would use up a good chunk of your calories and isn’t considered optimal for 5:2 fasting.

Alternate Day Fasting

As the name implies, this fasting method alternates full fasting days with eating days where you can eat normally. Pure juices made entirely from fruits and low-sugar vegetables are acceptable to consume on fasting days for most people. Since you get an entire day for eating less than 24 hours later, juice can help provide nutrients and ease hunger pangs on your fasting days.

24 Hour Fast (Eat-Stop-Eat)

The eat-stop-eat style of intermittent fasting involves doing one or two 24-hour fasts per week, say from dinner Monday night until dinner Tuesday night. Some allow pure, minimal-ingredient vegetable and fruit juices during the 24 hours, while others believe even juice will technically break your fast. It depends on how strict you want to be with your full day fasts. Juice gives you something to look forward to and can provide essential minerals and vitamins, so many utilize it without undermining their fast’s effectiveness.

Benefits of Juicing While Intermittent Fasting

Assuming you choose an intermittent fasting protocol that allows juices during fasting periods, here are some potential benefits of incorporating juicing into your regimen:

Nutrient Intake

One downside of fasting is it can lead to nutrient deficiencies, as you spend less time eating solid foods during the week. Juicing provides a powerful dose of vitamins, minerals, antioxidants, enzymes, and other beneficial plant compounds. This helps ensure you meet your nutritional needs even when fasting.

Reduced Hunger

Juice helps fight the hunger pains and cravings brought on by long fasting periods. This makes it easier to stick with your intermittent fasting schedule.


Freshly pressed organic juices flood your body with cleansing and detoxifying compounds. This accelerates the cellular regeneration and toxin purging benefits of fasting.

Weight Loss Boost

Some research indicates juice may support weight loss when part of a healthy diet. Drinking low-sugar, low-calorie juices made primarily from veggies during your fast makes it easier to maintain a calorie deficit.


Juicing enables you to get a concentrated dose of fresh fruits and greens with minimal effort. It takes just seconds to juice up a drink packed with produce that would take far longer to consume whole.

Drawbacks of Juicing While Fasting

While juicing on fasting days may offer benefits, there are also some potential downsides to consider:

It Technically Breaks Your Fast

One of the main criticisms is that consuming juice goes against the fundamental premise of fasting, which is giving your body an extended break from digestion and calorie intake. Even 100% fruit and vegetable juice contains natural sugars and calories that require processing by the body.

Blood Sugar Spikes

The sugars and carbohydrates in juice can cause swings in blood glucose when consumed in excess. For diabetics or those looking to control blood sugar, juice consumption should be monitored.

Hunger Increase

While juice may temporarily relieve hunger at first, some find the nutrients and sugars trigger increased appetite and cravings later on. This can sabotage the mental clarity and control fasting is meant to provide.

Loss of Fiber

Juicing removes the insoluble fiber content of whole fruits and vegetables. Fiber provides many benefits for fullness, gut health, and stable energy levels.

High in Sugar

The juicing process concentrates natural sugars. Drinking too much can lead to excess sugar intake, even when using unsweetened produce. Moderation is key.

Lacks Protein

Juice contains very little protein, unlike whole produce. Consuming adequate protein is important for maintaining lean muscle mass while fasting.

Potential Fasting “Purist” Backlash

Some intermittent fasting enthusiasts argue against any juice consumption based on purist principles of giving your system an uncompromised, extended rest. They view even small amounts of juice as undermining the core purpose of fasting.

Tips for Juicing While Fasting

If you want to include juicing as part of your intermittent fasting plan, here are some tips to maximize benefits and reduce drawbacks:

Use Primarily Vegetables

Focus your juices on low-sugar veggies like celery, cucumber, spinach, kale, and cabbages to minimize sugar content. Limit higher-glycemic produce like apples, carrots, and beets to small amounts.

Spice It Up

Add spice to your juices for a flavor boost. Ginger, cayenne, cinnamon, turmeric, and black pepper can liven up your drinks.

Include Healthy Fats

Mix in coconut oil, avocado, nuts, or seeds to provide filling fats and protein.

Try Diluting or Freezing

Dilute concentrated juices with water or ice to lower calorie density. You can also freeze juices into popsicles for a satisfying cooling snack.

Limit Portions

Stick to 1-2 cups of juice maximum during fasting periods to avoid excess sugar and calories.

Time It Right

Drink juices earlier in your fast, as far from your next meal as possible. This prevents interference with hunger signals at the end of your fast.

Supplement Meals Too

Incorporate juicing into your regular diet on eating days. Doing so provides extra nutrition and health benefits beyond just using juices to get through fasts.

The Verdict: Is Juicing While Intermittent Fasting Right for You?

At the end of the day, whether or not to allow juicing during intermittent fasting comes down to your personal preferences and goals.

Here are some final guidelines to help you decide if juicing on your fasting regimen could be right for you:

  • If you follow less restrictive 16/8 or alternate day fasting plans, juicing can be utilized without significantly impacting results.
  • For stricter fasts like 24 hour or 5:2 plans, juicing is less recommended.
  • Pay attention to how juice impacts your hunger cues, energy, and ability to fast consistently.
  • Focus on veggie juices with minimal fruit and sugar content.
  • Watch your portions and don’t overdo juice intake.
  • Time juice consumption carefully around your eating window.
  • Consider your fasting philosophy – are you comfortable with some flexibility or do you prefer a purist approach?
  • Talk to your doctor if you have any medical conditions that could impact your intermittent fasting or juicing regimens.

Remember, juicing shouldn’t make up your entire nutrition plan but can be used as a supplement to intermittent fasting. Aim for balance, moderation, and listening to your body’s signals as you determine if and how to incorporate juicing into your own lifestyle.

Sample Juice Recipes to Try While Fasting

If you want to test out juicing while intermittent fasting, try whipping up one of these refreshing, low-sugar juice blends on your fasting days:

Green Morning Juice

This green veggie juice provides a dose of nutrients to start your day right and fight hunger during your fasting window.


  • 5 leaves kale
  • 1 cucumber
  • 1 celery stalk
  • 1/2 lemon
  • 1 inch ginger
  • 1/2 green apple

Carrot Beet Juice

For a nutrition and antioxidant packed veggie blend, try this carrot beet juice. Beets provide blood pressure benefits as well.


  • 3 carrots, tops removed
  • 1 beet, scrubbed well
  • 1 cucumber
  • 1 inch ginger
  • 3 celery stalks
  • 1 lemon, juiced

Spicy Green Juice

Jalapeno and other spices add a flavor kick to keep your tastebuds happy during fasting periods.


  • 1 cup pineapple chunks
  • 2 cups spinach
  • 1 cucumber
  • 1/2 jalapeno, seeds removed
  • 1 tablespoon ginger
  • 1 celery stalk
  • 1/2 lemon, juiced

Get creative and try mixing up your own juice blends using your favorite veggies, fruits, and spices!

The Bottom Line

Juicing during intermittent fasting can be a smart strategy for some, while more strict fasters may want to avoid it. Pay attention to your body, get creative with produce choices, and don’t overdo the portions.

Avoid letting juice intake spike blood sugar or trigger increased hunger that could derail your fasting regimen. Used judiciously, juicing provides an extra boost of cleansing, energizing nutrition to supplement intermittent fasting.

With the right approach, juicing can be an asset rather than a hindrance to fasting for improved health.

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