Dr. John Jaquish has developed what he calls an “accelerator protocol” for fasting—a strategic 36-hour fast performed once weekly for six weeks.
His approach promises significant reductions in visceral fat and improvements in insulin sensitivity, but with a critical difference from traditional extended fasts.
He believes the secret lies not in fasting duration, but in the biological setup you create beforehand and the intentional actions you take throughout.
And according to Dr. Jaquish, when done correctly, this protocol can replicate the benefits of a seven-day fast in just 36 hours—without the muscle loss that plagues longer fasting periods.
Jump to:
- The Foundation Comes First
- Why 36 Hours Instead of Seven Days
- The Three Critical Phases
- The Remaining Week: Strategic Fueling
- Women and Fasting: Breaking the Myths
- Medical Augmentation Tools
- The Muscle Preservation Paradox
- Real Results: The Clinical Evidence
- Common Pitfalls and How to Avoid Them
- Who Should Attempt This Protocol
- The Bigger Picture: Fasting as Biological Tool
- Implementation Checklist
- Final Considerations
The Foundation Comes First
Dr. Jaquish emphasizes that jumping into aggressive fasting without proper preparation is “a suicide mission.”
Before attempting his protocol, clients must meet specific metabolic markers: fasting insulin below 10, visceral fat index under 10, and healthy liver function markers.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
Nutritional foundation matters enormously. Understanding your total daily energy expenditure (TDEE) and maintaining proper macronutrient distribution throughout non-fasting periods sets the stage for success.
The foundation has to be there. The idea that you come off the street and you fast and you’re going to get a magical result—I mean in effect you will get a better result than time-restricted eating. But we also know there’s a liability to fasting and that’s really where the concern lies.
Dr. Jaquish warns against layering additional fasting windows into the week. Restricting nutrients outside the designated 36-hour window creates what he calls “a disaster in the making.”
The non-fasting days are equally critical—they’re designed for growth, recovery, and maintaining performance.
Why 36 Hours Instead of Seven Days
Traditional fasting protocols suggest three days for optimal ketone production and five to seven days before significant autophagy begins.
The problem? Extended fasts come with a devastating side effect: skeletal muscle loss.
I want to get 7 days in 32 to 36 hours because the biggest fundamental difference there is avoiding the liability that we know exists for prolonged fasting, which is muscle loss.
Skeletal muscle represents your most powerful longevity tool. Losing it while fasting undermines the entire purpose of metabolic optimization.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
Dr. Jaquish’s solution involves creating an intense energy demand through strategic exercise, movement, and heat exposure. These interventions accelerate glycogen depletion and force rapid metabolic transition into deep ketosis.
According to his clinical data, clients reach ketone levels of 4-4.5 millimoles per liter within 16 hours—levels that typically require five to seven days of conventional fasting.
The Three Critical Phases
Dr. Jaquish breaks his protocol into three distinct phases: glycogen depletion, metabolic transition, and refeed.
Each phase demands specific actions at precise times. Three consecutive days each week—pre-fast, fast, and post-fast—determine the entire outcome.
Phase One: Glycogen Depletion (Pre-Fast Day)
The fast actually begins the day before you stop eating.
Morning training is essential. Dr. Jaquish recommends heavy resistance training—preferably lower body or full body—followed immediately by metabolic conditioning.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
This isn’t Pilates or yoga. Weight training with sustained elevated heart rate (approaching 170 bpm) creates the glycogen-depleting demand necessary for rapid metabolic shift.
The intensity of that training episode on your pre-fast day I believe is a key principal driver of the fasting period.
Post-workout nutrition breaks from conventional wisdom: zero carbohydrates. Protein and quality fats only.
The final meal happens before 6 PM—something light like salad with salmon. Again, no carbohydrates.
Then comes the critical movement window: 60 minutes of low-intensity walking after dinner, followed by high-heat sauna.
Sauna exposure represents what Dr. Jaquish calls “an atraumatic mechanism to upregulate energy demand.” High heat drives heat shock protein production while creating metabolic stress that accelerates fat mobilization.
Don’t have access to a sauna? A very hot bath produces similar thermal stress, potentially even more effectively than dry heat.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
Phase Two: Metabolic Transition (Fast Day)
The fasting day itself centers on one principle: create relentless energy demand.
Dr. Jaquish expects clients to accumulate 20,000+ steps. Movement should be distributed throughout the day, not crammed into one session.
You don’t lay on your couch when you’re fasting. You move more. Where are you going to come up with the time? It’s when you’re shoveling food into your face—now you’re not doing that. So you replace that time.
Caffeine is strongly encouraged. Black coffee or zero-calorie energy drinks create additional metabolic demand without breaking the fast.
Despite concerns about artificial sweeteners triggering insulin responses, Dr. Jaquish’s continuous ketone monitoring data shows no significant impact from non-nutritive sweeteners.
Sauna sessions bookend the day. Dr. Jaquish personally performs 45 minutes morning and evening, though he acknowledges this requires building tolerance over time.
Minimum recommendation: two 30-minute sessions or three 20-minute sessions.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
Electrolyte supplementation becomes critical with heavy sauna use. Products containing 500+ mg sodium help replace what’s lost through sweat.
What You Cannot Consume
The list is straightforward but strict:
- No bone broth during the fast (only for refeeding)
- No amino acids or BCAAs—leucine triggers insulin response that shuts down ketosis
- No exogenous ketones—they artificially inflate measurements without creating the underlying metabolic state
- No food of any kind (this should be obvious, but apparently requires stating)
Tracking the Biomarkers That Matter
Dr. Jaquish is adamant: ketones are the biomarker to follow.
If your ketones are going up, every other condition has to be met—glycogen depletion, insulin normalization, high-grade lipolysis, then ketones.
Urine ketone strips are unreliable. Blood ketone meters (like Keto-Mojo) or continuous ketone monitors provide accurate measurements.
Continuous ketone monitoring transformed Dr. Jaquish’s practice. Real-time data reveals exactly how different foods, activities, and stressors impact metabolic state.
Target metrics throughout the protocol:
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
- Beginning of fast: 1.0-1.2 mmol/L (nutritional ketosis)
- Midday of fast: minimum 1.5 mmol/L
- Peak during fast: 4.0-4.5 mmol/L (equivalent to 5-7 day fast)
If ketones remain stubbornly low despite following protocol, something is wrong. Illness, excessive stress, or inadequate preparation will block ketone production.
Dr. Jaquish frequently stops clients’ fasts when data indicates their bodies aren’t ready. Better to reset and try again than waste effort on an ineffective fast.
Phase Three: The Refeed (Post-Fast Day)
How you break the fast matters enormously.
Morning assessment on day two depends on how you feel. If energy is high, add another sauna session and movement. If depleted, begin refeeding immediately.
First food: bone broth exclusively. Nothing else.
Bone broth serves two purposes—it gently reactivates gut function and provides easily-absorbed nutrients without requiring significant digestive labor.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
Critically, it lacks leucine, preventing premature insulin spike that would shut down remaining ketone production.
Wait minimum two hours after bone broth before introducing whole foods.
I once broke a fast with a ribeye. That’s really harsh.
When whole foods resume, sequence matters: protein first, then fat, then carbohydrates gradually throughout the day.
Training on post-fast day should be light—about 50% normal intensity and duration. Muscle tension is fine; maximal effort is not.
Your body lacks top-end fuel. Pushing hard courts injury and undermines recovery.
The following day (day three post-fast initiation), intense training resumes normally.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
The Remaining Week: Strategic Fueling
The four non-protocol days each week aren’t “off days.” They’re growth days.
Dr. Jaquish employs carb cycling: higher carbohydrates on training days (timing around workouts), lower carbohydrates (75-100g) on non-training days.
Post-workout carbohydrate repletion is critical during non-fasting weeks. Growth signals must remain active.
It’s all about fasting? No, actually, it’s all about growth and fasting. Because when you’re not fasting, I still want your growth signals on—even more importantly.
Movement patterns continue throughout the week. Centering 10,000 daily steps around meal times dramatically improves glycemic variability compared to random movement.
This intentionality compounds the metabolic improvements created during fasting.
Women and Fasting: Breaking the Myths
Common advice suggests women shouldn’t fast aggressively due to cortisol concerns and hormonal disruption.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
Dr. Jaquish’s clinical data tells a different story.
Women are actually better fasters when you speak very clearly about lipolysis and ketosis.
Female cellular biology favors fat oxidation. Women in his practice consistently achieve higher ketone levels than men and enter ketosis more rapidly.
The critical distinction: women perform poorly under chronic calorie restriction but excel with short, intense metabolic challenges followed by adequate refeeding.
This aligns perfectly with the 36-hour protocol structure. Hit hard, then immediately return to sufficient nutrition.
Dr. Jaquish reports this pattern holds regardless of menstrual cycle phase.
Medical Augmentation Tools
In his clinical practice, Dr. Jaquish employs pharmaceutical interventions unavailable over-the-counter.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
GLP-1 agonists (like tirzepatide) play a powerful role. These medications improve insulin sensitivity and reduce “food noise”—the mental taxation that causes most people to abandon fasts.
Timing matters: clients take their dose the morning of pre-fast day to achieve peak effect during the fast.
Dr. Jaquish also utilizes:
- Dihydroberberine for improved glucose disposal and mitochondrial function
- Urolithin A for mitophagy and cellular cleanup
- Strategic dosing schedules that maintain baseline metabolic optimization
The outcome is what’s linked to human health and performance. My job as a physician is to get you to the outcome, which is successful fasts serially.
These tools aren’t “cheating”—they’re optimization strategies that improve adherence and results.
The Muscle Preservation Paradox
Perhaps the most counterintuitive aspect: clients on this protocol gain skeletal muscle during the six-week period.
Average increase runs 0.5-1% above baseline skeletal muscle mass.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
How is this possible during fasting?
Strategic resistance training signals muscle as essential to survival. Movement during fasting reinforces this signal—you’re demonstrating the muscle serves critical function.
Adequate protein and training stimulus during non-fasting days drives actual growth. The metabolic state created by fasting enhances nutrient partitioning and insulin sensitivity, making growth signals more effective.
This stands in stark contrast to extended fasts where muscle catabolism becomes inevitable.
Real Results: The Clinical Evidence
Dr. Jaquish reports dramatic outcomes from his clinical practice database:
- 50% reduction in total body fat mass within six weeks for some clients
- Significant visceral fat reduction (quantified via imaging)
- Improved insulin resistance markers (fasting insulin, glucose variability)
- Maintenance or gain of skeletal muscle mass
These results require everything being dialed in—foundation, protocol adherence, training, and often medical augmentation.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
The research on autophagy and fasting presents a more nuanced picture than sometimes suggested. While mechanistic studies show ketones can activate autophagy pathways, Dr. Jaquish acknowledges the measurement challenge.
They are not autophagy biomarkers. Those exist in a really high level lab and they’re very expensive, very hard to do and you’re doing tissue biopsies.
His working hypothesis: area under the curve for ketone production correlates with autophagic flux. Higher ketones maintained longer should drive more cellular cleanup.
This remains unproven in humans at this specific protocol’s parameters, though the biological plausibility is sound.
Common Pitfalls and How to Avoid Them
Starting without metabolic foundation. If baseline insulin sensitivity is poor, visceral fat high, and metabolic health compromised, aggressive fasting becomes counterproductive.
Spend weeks or months building foundation first.
Restricting calories outside fasting windows. This undermines performance, muscle maintenance, and adherence. Eat sufficiently during non-fasting periods.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
Sedentary fasting. Lying on the couch during fasts wastes the protocol’s potential and increases muscle loss risk.
Ignoring data. Without ketone tracking, you’re flying blind. Feelings don’t reliably indicate metabolic state.
Breaking the fast improperly. Jumping straight to heavy whole foods causes digestive distress and premature metabolic shift.
Training too hard post-fast. Your body lacks glycogen for high-intensity work. Pushing hard courts injury without benefit.
Who Should Attempt This Protocol
Dr. Jaquish’s accelerator protocol isn’t for beginners.
Ideal candidates:
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
- Already training consistently with resistance work
- Metabolically healthy baseline (or working with physician)
- Experience with shorter fasting protocols
- Ability to track biomarkers accurately
- Time and resources to implement all protocol elements
If resistance training “isn’t even on your radar,” Dr. Jaquish has reservations about using high-intensity fasting.
Muscle maintenance and growth signal muscle as survival-critical. Without this signal, fasting becomes muscle-wasting.
The Bigger Picture: Fasting as Biological Tool
Dr. Jaquish’s fundamental premise reframes fasting entirely.
Fasting is a biologic tool. It’s not how long you go without eating. Fasting duration is less of an issue than the biological setup that you create.
This perspective shifts focus from arbitrary time windows to metabolic outcomes.
The goal isn’t suffering through days without food. It’s achieving specific biological states—deep ketosis, insulin normalization, enhanced fat oxidation—in the most efficient manner possible.
Efficiency matters because time matters. Every additional day fasting increases muscle loss risk, disrupts normal life, and reduces adherence.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
By condensing the metabolic benefits into 36 hours through strategic intensification, the protocol becomes sustainable weekly rather than something attempted occasionally with dread.
The data-driven approach also allows real-time optimization. Continuous monitoring reveals immediately when protocol adjustments are needed, which foods impact ketosis, and how individual biology responds.
This transforms fasting from dogmatic rule-following into personalized metabolic engineering.
Implementation Checklist
For those ready to attempt Dr. Jaquish’s protocol, here’s the condensed action plan:
Preparation Phase (Weeks Before)
- Establish consistent resistance training program
- Calculate TDEE and dial in macronutrient targets
- Check baseline metabolic markers (fasting insulin, visceral fat)
- Acquire blood ketone meter or continuous ketone monitor
- Secure sauna access (gym, home unit, or bathtub protocol)
Pre-Fast Day (Sunday Example)
- Morning: intense resistance training + metabolic conditioning
- Post-workout: protein and fat only, zero carbs
- Dinner: light meal (salad + salmon), before 6 PM, zero carbs
- Evening: 60 minutes low-intensity walk
- Evening: 30-45 minute high-heat sauna session
Fast Day (Monday)
- Target 20,000+ steps distributed throughout day
- Morning: sauna session (30-45 minutes)
- Consume: black coffee, zero-calorie energy drinks, electrolytes
- Evening: sauna session (30-45 minutes)
- Track ketones at wake, midday, and evening
- No food, bone broth, amino acids, or exogenous ketones
Post-Fast Day (Tuesday)
- Morning assessment: if energized, add sauna and movement
- First food: bone broth exclusively
- Wait 2+ hours before whole foods
- Refeed sequence: protein → fat → carbohydrates
- Training if any: 50% intensity/duration maximum
Remaining Week (Wednesday-Saturday)
- Resume normal intense training
- Carb cycling: higher on training days, 75-100g on rest days
- Time carbohydrates around training
- Maintain 10,000+ steps daily, centered around meals
- Build toward next week’s pre-fast day
Repeat this cycle weekly for six weeks, tracking progress through ketone data, body composition metrics, and performance markers.
Final Considerations
Dr. Jaquish’s protocol represents aggressive metabolic intervention.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
It is not appropriate for everyone. Those with eating disorder history, certain medical conditions, or inadequate metabolic foundation should work with qualified healthcare providers before attempting.
The protocol’s intensity is precisely its advantage—creating profound metabolic shifts quickly—but also its risk if implemented carelessly.
What makes this approach compelling is the marriage of aggressive intervention with strategic protection. Muscle is preserved through training stimulus. Energy is maintained through mobilized fat. Duration is limited to prevent extended catabolism.
For those with metabolic disease, insulin resistance, or stubborn visceral fat despite good lifestyle habits, this protocol offers a powerful tool when conventional approaches plateau.
The six-week time frame provides sufficient stimulus for significant change while remaining mentally sustainable. Unlike permanent dietary restrictions, there’s an endpoint in sight.
Most importantly, the data-driven nature allows personalization. Your ketone response, energy levels, and performance metrics guide adjustments in real-time.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
This transforms fasting from blunt instrument into precision tool.
