FAQs

after-the-prolon-5-day-fast ·
Should I do a day of water fasting after completing ProLon®?
We do not recommend doing any additional water fasting after completing ProLon, as this has not been tested in any of our studies and may be unsafe in certain people. We have tested the ProLon program extensively for safety and...
eating-during-the-prolon-5-day-fast ·
What if I eat a meal inside the next day box in the middle of the night during the program?
Technically, since you ate it on the respective day for that item, it is within the study's limitations as we did define the timing of the meals as a factor to realize program benefits. Although we don't have any studies...
after-the-prolon-5-day-fast ·
The Transition Day Meal Plan recommends a trail mix of almonds, pecans, cashews, blueberries and dark chocolate. Can you advise the ratios of nuts to blueberries to chocolate?
There is no specific ratio of nuts, blueberries, and chocolate, but a general guideline might include mostly nuts with a small quantity of blueberries and dark chocolate (we cannot offer specifics, but a 70/30 split of 70% nuts, 30% blueberries...
after-the-prolon-5-day-fast ·
Why did my percent body fat go up after using ProLon?
We have found that the bioelectrical impedance scale/test, which is the most common body composition measuring tool, is not always adequately reliable to measure the effects of ProLon, especially during Days 5 and 6. This is most likely due to...
after-the-5-day-fast · after-the-prolon-5-day-fast ·
Do you have any recommendations for bars or cereals?
We offer the Fast Bar, which has been designed to provide your body with a carefully balanced ratio of macro- and micro-nutrients to help promote satiety. In a randomized, controlled study of 108 adults who completed a 15-hour overnight fast,...
about-multiple-prolon-cycles ·
What happens if I only do one cycle of ProLon in total?
ProLon users report dramatic shifts in their relationship to food after even just 1 cycle, as well as immediate weight loss and decrease in waist circumference. So even just one cycle of ProLon is worthwhile, and gives you a chance...
about-multiple-prolon-cycles ·
Can I do ProLon® more often than once per month?
ProLon® is only intended to be done one time per month. We have not tested the safety or efficacy of more frequent use, nor have we tested combining ProLon with other prolonged fasts. The body needs a balance between the...
about-multiple-prolon-cycles ·
How many cycles of ProLon can be recommended to an individual in a one-year period?
As with any diet, you should talk to your healthcare provider, who may recommend doing monthly cycles until you reach your individual goals, and then every 3-6 months thereafter to maintain long-term benefits.
eating-during-the-prolon-5-day-fast ·
Can the diet be stopped at Day 4?
The 5-day cycle has been carefully designed based on preclinical and clinical data, and therefore we recommend consuming all five days as directed to the extent possible.
eating-during-the-prolon-5-day-fast ·
What if food outside of the ProLon kit was eaten during one day of the diet, such as at a social event?
The ProLon kit was carefully designed to be the sole source of food intake during the 5-day fast, and the clinical studies proving its benefits were completed without the addition of any extra food. We strongly encourage you to stick...
Medically-Related ·
What if I get a headache? Can I take acetaminophen, ibuprofen, and/or aspirin?
Headaches can be from reduced caffeine intake during the ProLon program. To prevent this, we suggest slowly reducing your caffeine beginning a few days before you start your ProLon cycle. Headaches can also be from the fasting state, thought to...
Medically-Related ·
Should routine intake of dietary supplements and prescribed medications be stopped during the ProLon dietary program?
You should not stop taking any prescription medications, and should not stop using any over the counter (OTC) medications or supplements your healthcare provider has told you to use without discussing it with them first. For this reason, if you...
Medically-Related ·
Does growth hormone spike after the 5 days of ProLon?
Some studies have demonstrated a significant increase in growth hormone during a prolonged water fast (typically in days 3 to 5), but the clinical studies on ProLon did not report growth hormone levels, so we can’t definitively say if the...
Medically-Related ·
Will ProLon impact my sleep?
Most of the data regarding the effect of fasting on sleep is anecdotal. However, in a survey of ProLon users, among healthy volunteers surveyed and reporting a difference in quality of sleep after using ProLon for the first time, the...
Medically-Related ·
What do I do if I’m having trouble sleeping during the program (due to hunger)?
The L-bar may be consumed later in the day and the dinner soup can be consumed at a later time. Some people elect to drink a large glass of water to help them feel fuller before bedtime.
Medically-Related ·
Can I do a ProLon cycle while I’m menstruating?
None of our trials so far have studied the impact of ProLon on menstrual cycles, nor have we studied the optimal time to fast regarding female hormone levels. You can do a ProLon fast at any time during your menstrual...
Medically-Related ·
Do I have to wait to start ProLon after completing a round of antibiotics?
The impact of ProLon on antibiotics (or antibiotics on ProLon) has not been evaluated, but there do not appear to be any concerns with beginning ProLon 10-15 days after you have completed your course of antibiotics and symptoms have completely...
Medically-Related ·
Do we have a recommended ketone range during ProLon?
We do not have a recommended ketone range during ProLon mainly because although ketone measurement can indicate physiological fasting, it is not a complete indication of fasting, and is not an indicator of the molecular (cellular) fasting which ProLon also...
Medically-Related ·
Why are enemas and colon cleanses not recommended during the program?
There have not been any documented benefits of doing a colon cleanse during a fast and, in fact, colon cleanses have been demonstrated to increase the loss of electrolytes and potentially increase the risk of dehydration, which may be unsafe,...
Medically-Related ·
Why do I feel constipated or bloated?
Any significant change in diet can lead to changes in the gut, which may contribute to feelings of bloating and gassiness. If you typically consume a high fiber diet, or a diet high in carbohydrates (which tend to draw water...
Medically-Related ·
Can I do ProLon during platelet-rich-plasma therapy (PRP), stem cell therapy, other infusions like Remicade, or chelation therapy?
ProLon has not been evaluated in combination with any of these procedures. Please discuss with your healthcare provider, who may recommend waiting several days after finishing ProLon or any other low-calorie diet prior to any medical procedure, and waiting several...