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What is a vegetable juice fast?

A vegetable juice fast is a type of fasting where you consume only vegetable juices for a set period of time. It involves abstaining from all solid foods and consuming only fresh, raw vegetable and fruit juices. The goal is to give your digestive system a rest while flooding your body with vitamins, minerals and antioxidants from the nutritious juices. Vegetable juice fasts typically last anywhere from 1-5 days. Some people repeat the fast regularly as part of a detox or cleansing routine.

How it Works

On a vegetable juice fast, you’ll skip solid foods completely and only drink fresh juices made from vegetables, leafy greens, herbs and fruits. These juices provide your body with easily absorbed nutrients without taxing your digestive system. Since the juices are raw and unpasteurized, they contain enzymes and micronutrients that may help facilitate detoxification and healing.

Most vegetable juice fasts also incorporate ample water intake in addition to the juices. Herbal teas, vegetable broths and nut milks are sometimes included as well. It’s important to listen to your body’s signals and drink juices frequently to stay nourished and avoid intense hunger or weakness during the fast.

Proposed Benefits

Advocates claim that vegetable juice fasts may provide the following benefits:

  • Give your digestive system a rest
  • Flood your body with vitamins, minerals and antioxidants
  • Enhance detoxification and elimination
  • Stimulate weight loss
  • Improve energy and reduce fatigue
  • Nourish and regenerate cells
  • Support immune function
  • Reduce inflammation
  • Improve skin, hair and nail health

However, there’s limited scientific evidence to support these claims currently. More research is needed on the potential effects of juice fasts.

Foods to Include

Vegetable juice fasts center around produce that’s nutrient-dense and easy to juice. Some great options include:

  • Carrots
  • Celery
  • Beets
  • Cabbage
  • Kale
  • Spinach
  • Parsley
  • Cucumber
  • Bell peppers
  • Broccoli
  • Ginger
  • Garlic
  • Apples
  • Oranges
  • Grapefruit
  • Pineapple
  • Lemons
  • Limes

Aim for variety to obtain a wide range of nutrients. Combine vegetables and fruits together or with herbs like mint, basil and cilantro to create delicious juice blends.

Foods to Avoid

On a strict vegetable juice fast, you’ll avoid all solid foods, meat, dairy products, eggs, grains, nuts, seeds and even vegetable oils. You’ll also steer clear of coffee, tea and alcohol. Avoid juicing vegetables, fruits or herbs that you’re allergic or intolerant to.

Some specific foods and ingredients to avoid include:

  • Grains like wheat, oats, rice and quinoa
  • Meat including beef, poultry, pork and fish
  • Eggs
  • Dairy like milk, cheese, yogurt and ice cream
  • Cooked vegetables
  • Canned or bottled juices
  • Protein powders or supplements
  • Nuts, nut butters and seeds
  • Packaged snacks and sweets
  • Solid fruits like bananas
  • Starchy vegetables like potatoes
  • Beans, lentils and legumes
  • Coffee and tea
  • Alcohol

Focus exclusively on fresh, raw juices and water while fasting to get the full effects.

Preparing for a Vegetable Juice Fast

Preparing properly before a juice fast can help make it a smooth, positive experience. Here are some tips:

  • Consult your doctor: Especially if you have any underlying medical conditions, check that a juice fast is appropriate for you.
  • Plan your duration: Most last 1-5 days. Start conservatively if it’s your first time.
  • Stock up on produce: Shop for all the vegetables, fruits and herbs you’ll need for juices.
  • Get a juicer: You’ll need a way to make fresh juices. Invest in a quality juicer.
  • Drink lots of water: Stay well hydrated by drinking water throughout the fast.
  • Try a pre-fast: Gradually reduce calories for 1-2 days before fully fasting.
  • Rest and relax: Avoid strenuous exercise and get extra sleep during the fast.

Entering a fast gradually and taking time to rest can help minimize side effects.

Sample Juice Fast Schedule

What might a typical day on a juice fast look like? Here’s a sample schedule:

Upon Waking

  • Glass of water with lemon juice


  • Green juice made with spinach, kale, cucumber, parsley, celery and lemon


  • Herbal tea or water with ginger


  • Carrot, beet, apple juice


  • Vegetable broth or cup of hot water


  • Juice made with carrots, pineapple, turmeric, ginger and orange


  • Chamomile or mint tea

Drink juices whenever hungry and lots of water throughout the day. Listen to your body’s cues.

Tips to Make it Easier

Here are some tips to help make a vegetable juice fast more manageable:

  • Drink juice when hungry to prevent weakness or headaches
  • Sip juices slowly to help fill you up
  • Rinse your mouth with water or brush teeth to reduce food cravings
  • Keep busy to take your mind off food
  • Stay hydrated between juices
  • Get plenty of rest
  • Avoid strenuous exercise
  • Consider reducing work hours if possible
  • Plan activities to distract yourself

Having a plan and staying occupied can help you stick to the fast without feeling deprived.

Breaking the Fast

It’s important to break a juice fast gradually for optimal digestion and nutrition. Here are some tips for getting back to solid foods:

  • Break the fast with a green juice or vegetable broth
  • Slowly introduce smoothies and puréed soups with plant proteins
  • Move to raw fruits and steamed vegetables
  • On day 2, add in cooked whole grains like oats or quinoa
  • Day 3, incorporate plant-based proteins like beans, legumes, nuts or seeds
  • Day 4, begin to add lean meats, eggs or fish if desired
  • Day 5, resume a normal diet, avoiding processed foods and added sugars

Ease back into eating solids by starting soft, taking small portions and chewing thoroughly. This helps prevent uncomfortable reactions as your body readjusts.

Juice Fast Weight Loss

Many people try juice fasts for quick weight loss. Going several days without solid foods will likely result in some temporary weight loss, mainly from:

  • Loss of water weight
  • Reduced calorie intake
  • Using stored glycogen for energy
  • Less bulk and waste in your digestive tract

However, most experts agree this initial weight loss is short term and not sustainable. You may regain the weight quickly once you resume normal eating. Fasting risks muscle loss and slowing your metabolism as well.

Here is a table showing the possible short-term weight loss from juice fasts of different durations:

Juice Fast Duration Estimated Weight Loss
1 day 0.5-2 lbs
3 days 2-5 lbs
5 days 4-7 lbs
7 days 6-10 lbs

For lasting weight loss, focus on consistent healthy eating and exercise habits, not quick fixes like juice fasts.

Potential Side Effects

Vegetable juice fasts may lead to side effects including:

  • Hunger and food cravings
  • Irritability and headaches
  • Fatigue and weakness
  • Dizziness or lightheadedness
  • Nausea
  • Constipation
  • Diarrhea
  • Muscle cramps
  • Sugar crashes

These usually increase the longer you fast. Drinking enough fluid, getting sufficient rest and minerals like sodium and potassium can help minimize adverse effects.

Health Risks

Juice fasts may pose certain health risks, especially for people with medical conditions. Potential risks include:

  • Severe calorie and nutrient deficiencies
  • Loss of muscle mass and slower metabolism
  • Hypoglycemia
  • Dehydration and electrolyte imbalances
  • Gallstones or kidney stones
  • Hormonal issues
  • Low blood pressure
  • Dangerously high levels of uric acid or toxicity

If you have diabetes, kidney disease, liver disease, malnutrition, blood sugar issues, history of eating disorders or are pregnant or breastfeeding, avoid juice fasts and follow a more balanced nutrition plan instead.

Who Should Avoid Juice Fasts

The following people should not do a vegetable juice fast:

  • Pregnant or breastfeeding women
  • Children or teenagers
  • People with gout
  • Those with kidney problems
  • People with eating disorders
  • People with nutritional deficiencies
  • Those with diabetes or blood sugar issues
  • People prone to hypoglycemia
  • Anyone with medical conditions without first consulting their doctor

For vulnerable populations, juice fasts may do more harm than good. Always get personalized medical advice first.

Bottom Line

Vegetable juice fasts involve consuming only raw, fresh juices for up to five days. Advocates claim this gives the digestive system a break and provides concentrated nutrition. However, juice fasts are extremely restrictive and may pose health risks without medical supervision. Most of the proposed benefits also lack solid scientific evidence currently.

While periodic juice fasts are generally safe for most healthy adults in the short term, they aren’t necessary or advisable for everyone. Be sure to consult your healthcare provider first if you’re considering a juice fast.


Vegetable juice fasts can provide an influx of vitamins and minerals when done occasionally and properly. However, they are very restrictive and not a sustainable, long-term solution. While brief juice fasts are relatively safe for most healthy people, they may be dangerous for those with certain medical conditions. Check with your doctor before attempting one, especially if you have any health problems or nutritional deficiencies.