how often can you do a 72 hour fast
A 72-hour fast is usually best treated as an occasional practice, not something to do back-to-back. For many healthy adults, a cautious range is a few times per year to once a month at most , while some forum users suggest once every week or two but that is more aggressive and not a medical recommendation.
Quick Scoop
A practical answer is: if you’re healthy and experienced, think “monthly or less”; if you’re new to prolonged fasting, think “quarterly or a few times a year.” Publicly available guides also caution that doing 72-hour fasts too often can raise the risk of dehydration, electrolyte problems, low blood pressure, and inadequate nutrition.
What people commonly do
- Beginners or general wellness: about 2–4 times per year.
- More experienced fasters: once a month or less is a common upper-limit suggestion in some guides.
- Forum advice: some people say once every week or two , but that’s anecdotal and much more aggressive than most safety-focused guidance.
When to be more careful
You should be extra cautious or avoid repeated 72-hour fasts if you have:
- Diabetes or take glucose-lowering medication.
- Kidney, heart, or blood-pressure issues.
- A history of eating disorders.
- Pregnancy, breastfeeding, or a medical condition that affects nutrition.
Safer approach
If you still want to do it, a conservative pattern is:
- Start with one fast and see how you recover.
- Refeed gradually after the fast.
- Don’t repeat it if you had dizziness, weakness, palpitations, or severe fatigue.
- Talk to a clinician first if you take medications or have any chronic condition.
Bottom line
If you want the shortest safe answer: most people should not do a 72-hour fast more than once a month, and many should do it only a few times a year. If you want, I can also give you a safer fasting schedule based on your goal: fat loss, autophagy, or insulin control.