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Three day fast? One day fast?
How long should you fast?

Helping you decide how long to fast.

While a three day fast is an excellent option and can fit nicely into a weekend, there are others. Give careful consideration when deciding how long to fast.

If you've never fasted before, a commitment of a day or less is easier to accomplish and will familiarize you with the process. Use that first experience to learn what your body's particular reactions are. Every body is unique. You need to learn about yours.

Transition periods

Keep in mind that the time commitment is longer than the actual fast. There are the transition periods both before and after, during which you ease away from your full diet and then ease back toward it.

The length of your transition periods can be based upon the length of the fast. You would take half the number of days of the fast for each transition period, essentially doubling the number of days between start and finish. So a 10 day fast would then require 20 days of attention and commitment from you. A three day fast would take 6.

Many feel 4 days is sufficient transition for both before and after any length fast. This assumes, however, that you are embarking on a new healthier eating plan, and not delving straight into junk food on the 5th day.

For a three day fast, you'll want to allot at least a day before and a day after. One day fasts can be begun with a light dinner the night before. Although, keep in mind that the longer you spend acclimating your body beforehand, the easier (more comfortable) your fast will be.

I've spent 5 days cleaning up my diet and scaling back portions for just a one day fast. It occurred more by happenstance than by design, but the day long fast was so much more comfortable and enlightening. And I enjoyed the mental/emotional and spiritual benefits of fasting much longer afterward.

Choosing a length

Length of time for a fast should always be the length that is right for you at the time. Remain flexible. Of course you'll have a goal in mind when you begin, but don't be too inflexible to end the fast should your body signal. Severe pain and discomfort may mean you have attempted too much, too soon. You can back off a bit, eating a small piece of fresh fruit for now, and consider spending some time on a cleansing diet before your next fast.

Longer-term fasters are advised to break their fast if and when "true hunger" appears. Guidelines for Breaking a Fast has information on the foods to use, their quantities and frequency.

Be careful not to fast too frequently; allow your body sufficient time to rebuild nutritional reserves. Two days per week is too frequent, as is one week every month. Recommended fasting times for regular, occasional "maintenance" and rebalancing are one day per week and/or 3 days per month and/or 10 days yearly.

Most common lengths for fasting

calendar days for fasting While these are the most common lengths for fasting, any amount of time can be chosen, depending on your particular situation.

  • one day fast or 24-hour fast. This is the recommendation for beginners. But don't discount even shorter fasts if you've never fasted before. Sixteen hour fasts can be helpful, as can adhering to the natural nightly fast of 10-12 hours.

    One day fasts are good when you feel something coming on, at the first sign of illness. It allows the body the resources to fight it off early.

    Click here for instructions on a one day apple fast.

  • three-day fast. Good to perform monthly as a sort of "maintenance" routine, to keep toxins cleansed regularly.

    To fit in a three day fast with a work schedule, Dr. Fuhrman suggests beginning a fast after Friday morning's breakfast and continuing through Sunday night. Friday's breakfast will provide the energy and sustenance needed for the day's work, but Saturday and Sunday should be kept free for bed rest if needed. Break the fast Sunday evening with a meal of fresh fruit, and you'll be ready for work again on Monday. (But now you'll be revitalized and clearer minded!)

    Here are guidelines for a one to three day fast using apples.

  • one week fast. Often used as a quarterly (seasonal) cleansing detox.
  • 10-day fast. This is the standard recommended length for a Master Cleanse fast. Also, many use this length as a yearly maintenance detox and cleansing.

    January is a popular month for such a yearly cleanse, even though those in cold climes would actually be better off waiting until warmer months to fast.

  • several week fast. These are only for the seasoned or those under close professional supervision. It's best to have plenty of experience under your belt before tackling a long-term fast. You need to be familiar with your own body and it's unique reactions to the fasting process.

    Dr. Fuhrman, who treats chronic medical conditions with therapeutic water fasting, generally recommends fasts from 14 to 21 days (with professional supervision), and on occasion recommends 28 days.

    The nutritional reserves of an individual play an important role in how long one can fast, and individuals of normal weight generally shouldn't water fast longer than three weeks or as Fuhrman states, they "can become so thin that they have a long road back regaining their strength".

According the Balchs' book, Prescription for Nutritional Healing, considered by many to be a modern-day bible on natural health and healing, different length fasts accomplish different things:

  1. three day fast - aids in eliminating toxins and cleanses the blood
  2. five day fast - begins "healing and rebuilding the immune system"
  3. ten day fast - heads off problems in the making and helps to prevent illness, including degenerative diseases

When to seek supervision

More stringent guidelines recommend you have supervision by a fasting professional whenever attempting a fast longer than 3-5 days. Looser guidelines suggest that up to 10 days is ok for the partial fasts that include some nutrition.

For water fasts, however, you should have supervision before attempting a fast longer than 3 days due to rare problems that can occur. See the water fasting page for the particulars on water fasts.

For fasting supervision, the International Association of Hygienic Physicians (IAHP) is an organization of primary care physicians who are trained in fasting supervision. They must pass certification standards that include a six-month internship. See here for their home page: http://www.iahp.net

Fasting without supervision means you must watch any detox symptoms carefully, and don't push yourself. Ease up or end the fast if symptoms become severe. Don't let anyone convince you to continue since it's "for your own good"; your first responsibility is to yourself so you must listen to your own guidance.

If you have significant medical conditions, consider going on a fasting retreat where you would get constant personal attention. Someday soon I hope to provide more information on these retreats.



When deciding, say, between a three day fast and a ten day, consider your lifestyle and commitments. How much of yourself can you realistically commit at this time? Longer fasts take more than just greater length of time, they'll require greater support and understanding from family and friends and greater awareness on your part of your body's reactions.

Plan on doing longer fasts when the time is right and you can be truly devoted to the process, instead of trying to squeeze them into a too busy life. Fasting of any length should be approached as an inner experience if you want to gain the greatest benefit.

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Helpful Topics

Intermittent Fasting offers several unique methods for integrating regular fasting into your life.

Health Conditions Improved by Fasting. See the long list of ailments that are known to respond well to fasting.

Fruit Fast Details how to do a 1-3 day fast with apples.

Cleansing Diets offers guidance on using a cleansing diet as a partial fast or as a means of preparation for other types of fasting.

Dry Skin Brushing shares the many health benefits derived from this quick and easy-to-do practice.

The real benefits of Fasting for Weight Loss, affecting deep and lasting changes in our lives.

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Kitchari for Cleansing Information and recipes for using this healthy traditional Indian dish for a fast or for every day meals.

Emotional Benefits of Fasting offers insight on the healing effects fasting has on our emotional and mental patterns.

Water Fasting Tips offers guidance and support useful during any type of fast. Helpful in "getting over the hump".


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