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Lewis HowesFAST THE RIGHT WAY: What To Eat & When To Eat For LONGEVITY | Dave Asprey
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Chapter summaries
Why There's No Single Right Fast
Lewis asks which fast works best for Dave and for the general population. Dave explains that the right fast differs by sex, time of life and even day to day, so you should adjust to your readiness and avoid the fasting trap of more is better.
- •Women are not just smaller men, so recommendations vary
- •The right fast changes daily; Dave skipped fasting after a 2:30 AM TV appearance
- •Twelve hours is the minimum fast that does anything
- •Fasting is like exercise: a U-shaped curve where too little or too much reduces benefits
- •Minimum effective dose for women is about three fasts a week
Brain, Gut Rest and Cravings vs. Hunger
Dave explains what happens in the body during longer fasts: energy shifts from digestion to repair and the brain, and ketones fuel neurons. He says MCT oil gives the ketones of a three-day fast, and he distinguishes intense cravings from gentle hunger.
- •The average person spends about 15% of thoughts on the next meal
- •Digestion costs energy, and a high-carb breakfast sets up muffin cravings
- •Ketones give neurons more electrons than glucose
- •MCT oil during a fast gives ketones of a third-day fast while staying fasted
- •Cravings feel like disaster; hunger is a gentle presence
Biggest Fasting Mistake: Over-Fasting
Asked about the biggest mistake, Dave describes the trap of assuming something that worked will always work. He lists the signs of over-fasting and over-doing keto, and describes the return on investment of fasting.
- •Over-fasting signs in order: sleep quality, hormones, then hair thinning from raised cortisol
- •Dave's own three-month near-carnivore period hurt his sleep
- •Mix up the fasting schedule and listen to your energy
- •Fasting has the highest return on investment because you spend no time, money or energy on breakfast
What to Eat Before a Fast
Lewis asks about the worst food to eat before fasting. Dave names fried foods and explains the three components of food (calories, nutrients, anti-nutrients), then recommends grass-fed steak, cooked vegetables and good fats, and warns about nightshades and kale.
- •Fries cooked in bad oils lead to gnawing hunger
- •Calories are energy, and low-calorie diets fail
- •Anti-nutrients are the overlooked third category
- •Satiating choices: grass-fed meat, cooked vegetables, undamaged fats like olive oil, MCT, avocado, dark chocolate
- •Bell peppers and raw kale cause problems for many people
Fasting, Anti-Aging and Autophagy
Dave explains how regular fasting reduces insulin resistance, limits glycation and triggers autophagy, which clears debris and weak mitochondria. He says it also raises stem cells, testosterone and growth hormone.
- •14–16 hours is enough to start
- •Insulin resistance raises all-cause mortality
- •High sugar forms advanced glycation end products
- •Autophagy clears junk and replaces weak mitochondria
- •Fasting increases stem cells, testosterone and growth hormone at no cost
Stem Cell Therapy and Metabolic Resilience
Lewis asks about new stem cell developments. Dave describes his own bone marrow procedures, his measured reaction time and arterial flexibility, newer blood-derived options and his concerns about donor cells, and ties fasting to resilience.
- •Dave has had bone marrow stem cell procedures twice and reports no bodily pain
- •He measured the reaction time of a 20-year-old and arteries of a 24-year-old
- •Very small stem-like cells from blood are in a regulatory gray zone
- •He is wary of stem cells pooled from multiple donors
- •Fasting before a procedure helps because of a stronger metabolism
The Worst Diets: Seed Oils, Industrial Meat and Sugar
Lewis asks if there is a worst diet, and Dave names the standard American diet. He ranks its problems as seed oils, industrially raised meat, then sugar.
- •Seed oils drive insulin resistance and weak mitochondrial membranes
- •Industrial meat carries xenoestrogens, antibiotics, glyphosate and bad oils
- •Industrial agriculture depletes topsoil
- •Sugar is harmful and addictive but less so than corn oil
- •Birthday cake with butter and sugar beats cake with canola oil
Dave's Case Against Veganism and the mTOR Cycle
Dave calls the vegan diet the second worst for those who think they're healthy, drawing on his time as a raw vegan. He then explains mTOR and describes cycling fasting, exercise and protein to build muscle while avoiding both chronic elevation and chronic suppression.
- •Plant oils and anti-nutrients cause cravings and deficits
- •Dave describes added allergies and hypothyroidism from veganism
- •Chronic mTOR elevation is tied to cancer; chronic suppression leads to frailty
- •Fasting, exercise and coffee suppress mTOR; fast, lift, then eat protein
- •Cycling in and out of diets is better than any single diet forever
Vegan Documentaries, Curiosity and Lewis's Experiments
The conversation turns to vegan films, athletes such as Usain Bolt and being open to being wrong. Dave says two things hold across diets: fast daily and eat what doesn't make you hungrier afterward. Lewis shares his recent keto and vegetarian experiments and his gut-focused testing.
- •Dave criticizes What the Health and Game Changers as propaganda
- •Lewis notes athletes may be vegan for other reasons or confounded by age
- •Dave stresses willingness to be wrong
- •Two constants: fast daily and eat foods that satisfy
- •Lewis tests foods by how they affect digestion
Three Hacks to Make Fasting Easier
Dave presents three things allowed during a fast, starting with black coffee, which he says doubles ketone production. He then covers MCT oil with grass-fed butter and prebiotic fiber, explaining why these don't break a fast and how to dial them back.
- •Black coffee doubles ketones and suppresses ghrelin while raising CCK
- •Insulin and mTOR, not calories alone, break a fast; carbs, sugar or protein do
- •Up to five cups of coffee a day is linked to longevity
- •Butter and MCT give ketones without raising insulin or mTOR
- •Prebiotic fiber feeds gut bacteria, suppresses hunger and is pro-ketogenic
- •Use all three at first, then dial back
Five Biohacks: Forgiveness First
Lewis asks for Dave's five biohacks. Dave begins with forgiveness, discussing forgiving others, the act and yourself, and tells how his four-day cave fast taught him about hanger and self-forgiveness.
- •Forgiveness is a practiced skill that gives more energy
- •Being tired and hungry makes forgiveness harder
- •Lewis says forgiving yourself is just as important
- •Dave describes fasting in a cave for four days
- •Forgiveness is a three-part exercise: the other person, the act, yourself
Sleep, Movement, Cold and Neurofeedback
Dave covers the remaining biohacks: sleep with dimmed lights and blue-blocking glasses, daily walking plus weekly intense effort, cold exposure and neurofeedback. He says neurofeedback deepened his forgiveness practice.
- •Sleep well by dimming lights, blacking out the bedroom and blocking four light frequencies
- •Walk 20 minutes daily and do a 10-minute hard effort once or twice a week
- •End showers with cold on forehead and chest; it feels exhilarating after three days
- •Neurofeedback gives external feedback on meditation
- •Dave clarifies the 'work' he mentioned means personal growth
Resources and Closing Thoughts
Lewis points listeners to Fast This Way and Dave's sites, including a free two-week fasting training. They discuss social platforms, and Dave asks listeners to learn to skip breakfast. They close with mutual appreciation and a mention of Dr. Jason Fung.
- •Fast This Way is on Audible and Amazon; fastthisway.com offers a free two-week training
- •Dave is mostly on Instagram and now TikTok
- •Lewis prefers evergreen long-form content
- •Dave says intermittent fasting should be part of most people's lives
- •Lewis mentions Dr. Jason Fung's work on reversing type 2 diabetes
