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Fast This Way

Fast This Way

Burn Fat, Heal Inflammation, and Eat Like the High-Performing Human You Were Meant to Be
by Dave Asprey
3.89
2k+ ratings
Health
Self Help
Nutrition
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Key Takeaways

1. Fasting is a powerful tool for physical and mental transformation

"Fasting changes your perception of the world."

Ancient wisdom, modern science. Fasting has been practiced for thousands of years across cultures and religions. Modern research now confirms its numerous health benefits. Fasting triggers autophagy, a cellular cleaning process that removes damaged proteins and organelles, promoting longevity and reducing inflammation. It also improves insulin sensitivity, supports weight loss, and enhances cognitive function.

Beyond physical benefits. Fasting is not just about abstaining from food; it's a journey of self-discovery and personal growth. By voluntarily going without, you learn to distinguish between true needs and mere wants. This process can lead to increased self-awareness, emotional resilience, and a deeper appreciation for life's simple pleasures. Fasting challenges you to confront your habits, cravings, and fears, ultimately empowering you to take control of your life.

2. Intermittent fasting offers flexibility and health benefits

"Fasting is only in your head."

Flexible fasting. Intermittent fasting (IF) is not a one-size-fits-all approach. It can be adapted to fit various lifestyles and goals. Common methods include:

  • 16:8 (16 hours fasting, 8 hours eating window)
  • 5:2 (5 days of normal eating, 2 days of restricted calories)
  • OMAD (One Meal A Day)

Bulletproof approach. The author's "Bulletproof Intermittent Fasting" method involves consuming Bulletproof Coffee (coffee with grass-fed butter and MCT oil) during the fasting period. This approach aims to maintain the benefits of fasting while providing sustained energy and reducing hunger. By keeping insulin levels low and promoting ketosis, this method can enhance fat burning and mental clarity without the discomfort often associated with traditional fasting.

3. Sleep and fasting work synergistically to improve overall health

"Good sleep hygiene and good fasting habits go hand in hand."

Circadian rhythm optimization. Both sleep and fasting are deeply connected to our circadian rhythms. Aligning eating patterns with natural light-dark cycles can enhance sleep quality and overall health. Avoiding late-night meals allows the body to focus on repair and restoration during sleep, rather than digestion.

Fasting for better sleep. Fasting can improve sleep quality by:

  • Reducing inflammation
  • Enhancing melatonin production
  • Promoting deeper, more restorative sleep stages

Conversely, good sleep supports successful fasting by regulating hunger hormones and improving willpower. To optimize this synergy, consider:

  • Establishing a consistent sleep schedule
  • Creating a dark, cool sleeping environment
  • Avoiding screens before bedtime
  • Timing your last meal at least 3 hours before sleep

4. Exercise and fasting together enhance metabolism and strength

"Fasting makes you sharper."

Metabolic flexibility. Combining fasting with exercise can enhance your body's ability to switch between burning glucose and fat for fuel. This metabolic flexibility leads to improved energy levels, better body composition, and increased longevity. High-Intensity Interval Training (HIIT) is particularly effective when combined with fasting, as it stimulates muscle growth and fat burning while preserving muscle mass.

Timing matters. The author recommends exercising towards the end of your fasting period for optimal results. This approach:

  • Maximizes fat burning
  • Enhances growth hormone production
  • Improves insulin sensitivity
  • Boosts cognitive function

However, it's crucial to listen to your body and adjust intensity as needed. For longer fasts, gentle exercise like walking is recommended to support the fasting process without overtaxing the body.

5. Fasting can lead to spiritual growth and self-discovery

"What the eyes are for the outer world, fasts are for the inner."

Ancient practice, modern application. Fasting has been a cornerstone of spiritual practices across cultures for millennia. By voluntarily abstaining from food, we create space for introspection, clarity, and heightened awareness. This can lead to profound insights, emotional healing, and a deeper connection to oneself and the world around us.

Altered states of consciousness. Extended fasts can induce altered states of consciousness, similar to those achieved through meditation or certain plant medicines. These experiences can provide:

  • Increased creativity and problem-solving abilities
  • Enhanced empathy and compassion
  • A sense of interconnectedness with all life
  • Clarity on life purpose and direction

To enhance the spiritual aspects of fasting, consider incorporating meditation, nature immersion, or breathwork practices. Remember that spiritual fasting is a personal journey, and it's essential to approach it with an open mind and without expectations.

6. Supplements can optimize the fasting experience

"Activated charcoal is the number one supplement I suggest taking during a fast, yet most people overlook it."

Strategic supplementation. While fasting primarily involves abstaining from food, certain supplements can enhance the benefits and ease potential discomfort. Key supplements to consider include:

  • Activated charcoal: Binds to toxins and reduces cravings
  • Electrolytes: Maintain hydration and mineral balance
  • MCT oil: Provides energy and supports ketosis
  • Magnesium: Supports sleep and reduces stress
  • Adaptogens: Help manage stress response

Caution and personalization. Not all supplements are suitable during fasting, and individual needs may vary. It's essential to:

  • Consult with a healthcare professional before adding supplements
  • Start with low doses and observe your body's response
  • Be aware of supplements that may break your fast (e.g., those containing calories or triggering an insulin response)

7. Women may need to approach fasting differently

"Women are not just men with wombs, even though a lot of the popular writing about diet and fasting might make you think they are."

Hormonal considerations. Women's bodies are more sensitive to caloric restriction due to their role in reproduction. Fasting can affect hormones like estrogen, progesterone, and cortisol, potentially leading to:

  • Irregular menstrual cycles
  • Fertility issues
  • Increased stress response
  • Thyroid imbalances

Adaptations for women. To reap the benefits of fasting while minimizing potential risks, women can:

  • Start with shorter fasting windows (12-14 hours)
  • Practice fasting on alternate days rather than daily
  • Increase calorie intake during eating windows
  • Pay close attention to nutrient density
  • Avoid fasting during pregnancy and breastfeeding

It's crucial for women to listen to their bodies and adjust their fasting practice accordingly. If negative symptoms arise, such as menstrual irregularities or extreme fatigue, it may be necessary to reduce fasting frequency or duration.

8. Various fasting methods cater to different needs and lifestyles

"There is no one-size-fits-all approach to fasting."

Fasting spectrum. Fasting methods range from mild calorie restriction to extended water-only fasts. Popular approaches include:

  • Time-restricted feeding (e.g., 16:8, 14:10)
  • Alternate-day fasting
  • 5:2 diet
  • Prolonged fasting (3+ days)
  • Fasting-mimicking diets

Personalization is key. Factors to consider when choosing a fasting method:

  • Health goals (weight loss, longevity, disease prevention)
  • Current health status and medical conditions
  • Lifestyle and work demands
  • Personal preferences and sustainability

Experiment with different approaches to find what works best for you. Start with shorter fasts and gradually increase duration as you become more adapted. Remember that consistency over time is more important than intensity.

9. Beware of the "fasting trap" and maintain balance

"Don't be afraid to break the fast."

Avoiding extremes. While fasting offers numerous benefits, it's possible to overdo it. The "fasting trap" occurs when people become obsessed with fasting, leading to:

  • Nutrient deficiencies
  • Hormonal imbalances
  • Disordered eating patterns
  • Social isolation

Maintaining balance. To avoid the fasting trap:

  • Cycle between fasting and regular eating periods
  • Allow for flexibility in your fasting schedule
  • Listen to your body and adjust as needed
  • Maintain a balanced, nutrient-dense diet when not fasting
  • Prioritize social connections and enjoyment of food

Remember that fasting is a tool for health and self-improvement, not a punishment or a test of willpower. If fasting begins to negatively impact your quality of life or relationships, it's essential to reassess your approach.

10. Fasting empowers you to take control of your life

"Fasting is going to make you stronger and more metabolically fit."

Beyond food control. Fasting is not just about controlling your eating habits; it's about developing mastery over your mind and body. By voluntarily abstaining from food, you prove to yourself that you can overcome cravings and impulses, building self-discipline that extends to other areas of life.

Transformative power. Regular fasting can lead to:

  • Increased self-awareness and emotional regulation
  • Enhanced decision-making abilities
  • Improved focus and productivity
  • Greater resilience in facing life's challenges
  • A sense of empowerment and self-efficacy

By mastering fasting, you demonstrate to yourself that you have the power to change your habits, overcome obstacles, and shape your life according to your values and goals. This newfound sense of control can be transformative, leading to positive changes in relationships, career, and personal growth.

Last updated:

Review Summary

3.89 out of 5
Average of 2k+ ratings from Goodreads and Amazon.

Fast This Way receives mixed reviews, with an average rating of 3.89/5. Readers appreciate Asprey's insights on fasting methods, biohacking, and spiritual aspects. Some find the book informative and inspiring, praising its accessibility for beginners. However, critics note excessive promotion of Bulletproof products, repetitiveness, and lack of scientific rigor compared to other fasting books. The book's approach to fasting is seen as flexible but potentially controversial. Readers value the discussions on sleep, supplements, and fasting differences for women, though some desire more concise information.

About the Author

Dave Asprey is a Silicon Valley entrepreneur and self-proclaimed "biohacker" known for his extreme self-experimentation. He claims to have spent $250,000 and 15 years optimizing his biology, resulting in significant improvements to his IQ, biological age, and weight. Asprey's work focuses on upgrading human performance through various biohacking techniques. He has gained recognition in the tech and health industries, with his writing featured in major publications like the New York Times and Fortune. Asprey has also presented at prestigious institutions and universities, sharing his insights on personal optimization and health enhancement.

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