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My Fasting Experiment

September 13, 2010 Written by JP    [Font too small?]

We’re all exposed to a fair share of advice and information about how to best to care for ourselves. If we’re fortunate, we also have the benefit of good counsel via a physician. But, ultimately, it’s up to us to decide what exactly to do with respect to our own health care. Do we take a medication or not? Are major lifestyle changes worth the effort? Should we have genetic testing to help foretell our medical future? Most people will be faced with these decisions and many others during the course of a lifetime. Today I’m going to tell you about a major health care choice I’ve decided to make in my own life. It involves following a diet known as “alternate day fasting”. My Healthy Monday tip of the week is to discuss the viability of this pattern of eating with your doctor if you’re concerned about cardiovascular health.

It’s long been established that ongoing caloric restriction can prevent various disease states and increase life expectancy in test animals. The periodic restriction of calories is also known to exert “mild dietary stress” in the body which approximates the way humans used to live during the hunter-gatherer era. What’s more, a recent laboratory study examined blood samples of study volunteers engaging in alternate day fasting (ADF) and found profoundly positive changes with respect to the aging process (cell proliferation and Sirt1 protein). All told, these facts form a strong theoretical basis for studying the effects of alternate day fasting in human subjects. (1,2,3,4,5)

Before I go any further, let me briefly describe the simple process behind ADF. The basic concept is that you eat regularly on one day. The next day you eat only one meal which is slightly smaller in size than usual. In effect this means that you’d eat at 100% capacity on one day and only 25% on the next. The following day, 100%. The day after that, 25% again. Typically, the one fasting day meal is consumed around the mid-day mark. On fast days, you’re encouraged to drink as much water and non-caloric beverages (black coffee, herbal tea, etc.) as you wish. Here’s an example of a healthy ADF menu from my perspective:

  • “Normal Feed Day”: Breakfast: organic, omega-3 eggs, almond pancakes and a cup of organic coffee Lunch: an organic green salad with a wild salmon fillet Dinner: organic roasted chicken with mashed organic cauliflower and a glass of biodynamic red wine
  • Alternate Fast Day: Mid-Day Meal: a large slice of southwestern egg bake, organic avocado slices and a glass of organic iced-tea

A study appearing in this month’s edition of the Nutrition Journal examined the effects of a 10 week ADF trial in a group of 16 obese men and women. A significant amount of weight loss (12 lbs) was reported on average. But more importantly, two key findings were demonstrated: a) the participants didn’t eat extra food on feed days; b) hunger levels decreased and remained low beginning at the 2 week mark of the intervention. In other words, their bodies adapted to this style of eating without compensating with additional calories on the normal feed days. The hunger issue is also of vital importance because it speaks directly to the sustainability of ADF. (6)

Only time will tell if alternate day fasting will, in fact, promote longer, healthier lives in large human populations. But here’s what we currently know with absolute certainty: Diabetes and heart disease are two of the leading causes of premature death worldwide. Alternate day fasting has been scientifically documented to mitigate many of the risk factors involved in both diseases.

  • A study published in the March 2010 issue of the journal Obesity reports that 8 weeks worth of ADF lowered body weight (12.5 lbs), fat mass (12 lbs), LDL (“bad”) cholesterol (25%) and triglycerides (32%). Other positive changes noted were a 4 cm reduction in waist circumference and a 30% increase in adiponectin – higher levels of which are inversely correlated to diabetes and heart disease. (7)
  • In November 2009, researchers from the University of Illinois, Chicago documented an additional benefit of alternate day fasting: the ability to lower systolic blood pressure. In the 10 week trial, the study participants started with a baseline reading of 124 mm/Hg and ended with 116 mm/Hg. Unfortunately, HDL (“good”) cholesterol levels were not elevated. (8)
  • A related form of caloric restriction known as intermittent fasting has exhibited related cardiovascular benefits, including improvements in circulatory factors (D-dimer levels, fibrinogen and prothrombin time) and a decline in homocysteine. The latter may play a role in atherosclerosis or hardening and thickening of the arteries. (9)
Source: Aging (Albany NY). 2010 Dec 11;2(1):7-27. (link)

In studying the full texts of the currently published ADF studies, I discovered an area that I felt could use some improvement – nutrient density. As an example, let’s take a look at three days of sample menus from the most recently published trial in the Nutrition Journal:

  • ADF Day 1 – chicken fettuccini, carrot sticks and a cookie
  • ADF Day 2 – vegetarian pizza, apple and peanuts
  • ADF Day 3 – chicken enchilada, orange and crackers

In my previous two-part interview with Dr. Krista Varady, a leading expert in ADF, she basically stated that the nutrition provided during the ADF clinical trials conforms to the mainstream dietary guidelines that are currently advocated. In my opinion, these guidelines leave much to be desired. For starters, the high-carbohydrate count in such menus (over 50% of total calories) could very well explain why the current batch of ADF studies have failed to find any HDL (“good”) cholesterol elevation. Previous studies using low carbohydrate dietary models have reported substantial improvements in good cholesterol. The most recent two-year trial discovered a statistically significant 23% rise in protective HDL concentrations in those consuming a carbohydrate-restricted diet. (10,11,12)

At present, I’ve been following an alternate day fasting regimen for about three-weeks. So far, my energy levels are good. I’m able to function normally and work out every other day. My blood pressure and blood sugar are better than ever. In addition, there are some other side-benefits worth noting. Our weekly grocery bill as reduced substantially, I’ve dropped 5 lbs and, best of all, I have more time to devote to activities other than eating and preparing food. It turns out that ADF is a money and time saver. In a few months I’ll have a blood panel conducted to compare those figures to my previous numbers. I’ll report back on what I discover and add some additional observations at that time. In the meantime, if you have any questions about how I’m implementing ADF in my own life, I’d be happy to share.

Be well!


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Posted in Diet and Weight Loss, Food and Drink, Nutrition

12 Comments & Updates to “My Fasting Experiment”

  1. Stan Says:

    I’ve been readong about the effect of the diet on sleep – on the fasting days, does this diet seem to disrupt your sleeping pattern?

  2. JP Says:


    No. Though some degree of hunger is (more) noticeable while falling asleep. I suppose this is because of a lack of activity and/or distractions.

    Be well!


  3. Randy Says:

    From what I’ve been told, learned, etc….fasting generally depletes the body of necessary vitamins and nutrients throughout the day and can cause fatigue, nausea, headaches, etc., etc.

    I started on a cleansing program that on some days I don’t eat any traditional foods, but instead drink a cleansing juice with lots of vitamins, minerals, herbs, etc. so that I get the results of fasting and detoxing, but without all the harmful side effects.

    Can you address the differences in your opinion?

    Thank you!

  4. JP Says:


    This is a different style of fasting. Your never without food for more than 18 hours.

    I don’t think nutrient deficiencies will be an issue provided that: a) one emphasizes nutrient-dense foods; b) appropriate supplementation is incorporated into the fasting regimen.

    Even the study that used a conventional diet (and no supplements) for 10 weeks found that lean body mass was preserved while body fat was lost. This is an indicator of adequate macro-nutrient status. However, I suspect that my preferred version of ADF while produce even better results precisely because of the improvement in nutrient quality and quantity.

    Be well!


  5. Randy Says:

    Thank you JP.

  6. BJ Says:

    I have been doing periodic fastings for some time. The latest time started with 10 days on water (up to 4 times a day with 1 Tbsp lemon juice and cayenne only added), every other day salt water flushes, and every 4th day a kiwi. Then I transitioned to a water only diet for 17 days thus far. I find that I do fine…except for the social/psychological aspects when I cook dinner for my family and leave while they eat or only have my water which they don’t fully understand). I have had a few healing crises already. My goal is 100 days before breaking the water fast. I think if I start more vegetable/lentil soup crock pot meals for the family and serve with spinach and assorted salad veggie salads it will decrease my personal issues with constant food preparation. This is definitely a time of cultural understanding and psychological as well as spiritual cleansing for me…even as much or more so than the physical benefits of dissolving plaque deposits within my arterial system and rejuvenating my entire body by eliminating toxins and facilitating renewal of organ systems. Other benefits I expect are: macular REgeneration, elimination of extremely mild beginning arthritis, increased natural HgH production and overall resetting of good health and wellness!

  7. KDC Says:

    JP, I am now trying ADF myself. Mostly, I am doing it because CR simply is not working for me, and my doctor and nutritionist are both scratching their heads over it. I simply can’t cut more calories out and can’t exercise more than I already am, so that eat less move more thing is NOT working.

    I heard about it somewhere and decided to give it a try, it’s the end of the first week, and I feel fine. It’s been hard and execution has not been flawless, mostly because I am still kind of on the fence about whether it’s okay or not, whether it will screw up my body or not. But you know, I am not having huge issues with feeling hungry, cranky or that kind of thing, and just taking it easy.

    One thing I am trying to figure out is how to work my swims into the schedule….like do I do my swims on feed days or whenever or just before breaking the fast….I am sure that will work itself out over time but if you have thoughts, love to hear them.

  8. JP Says:


    I’m currently off of my ADF program. I was losing too much weight! All told, I lost 15 lbs in about 6 weeks. That’s about as low as I want to go.

    I think exercising on normal feed days is probably the best approach. But I can tell you that on occasion I did work out on my ADF days without any (apparent) ill effect. In those instances, I would typically have a cup of black coffee in the late morning, work out and then have my one meal shortly afterward.

    Best of luck with your ADF adventure. I hope it helps you find better health and the weight loss you’re looking to achieve.

    Be well!


  9. KDC Says:

    So as an update. I tried this out and actually gained weight while fasting. Which apparently was the final straw for my doctor who finally diagnosed me with thyroid disease. Apparently, I have been having various issues for years, and the doctors have been ignoring my complaints and sending me from one place to another etc etc.

  10. Randy Says:

    I’ve decided to stop all fasting regimens and instead my girlfriend got me on a cleansing & detoxing program called Isagenix. It seems to have been the best thing for me so far. I lost the weight I wanted and I’ve never felt or slept better. Even finally went through a couple flu seasons without getting the flu. Yay!

    I found the liquid only programs to be too draining and difficult for me, but they may work for others.

  11. billy Says:

    So when did you eat, did you follow the 12-2pm window on your fasting day? whats the best way to determine your calories on the feast day?

  12. JP Says:

    Hi Billy,

    I think between 12:00 and 2:00 PM is a good, general time frame. According to Dr. Krista Varady, one of the leading researchers in the field of ADF, one should consume approximately 25% of the calories you need (to maintain weight) on the fasting days. So, if you normally require about 2,000 calories daily, then you should aim for roughly 500 calories on the fast days.

    If you haven’t read my interview with Dr. Varady yet, you might finding it interesting:



    Be well!


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