Jason Fung Collection 3 Books Set (The Obesity Code, The Obesity Code Cookbook, The Complete Guide to Fasting)

1. Fasting is a powerful, ancient healing tradition with numerous health benefits

Fasting is the most time-honored and widespread healing tradition in the world.

Ancient wisdom, modern science. Fasting has been practiced for thousands of years across cultures and religions. It's not just about weight loss; fasting improves mental clarity, induces weight loss, lowers blood sugar, increases energy, enhances fat-burning, lowers cholesterol, prevents Alzheimer's, extends life, reverses aging, and decreases inflammation. Modern research is now validating these benefits.

Fasting vs. starvation. It's crucial to understand that fasting is not starvation. Fasting is the voluntary abstention from eating for health, spiritual, or other reasons. Unlike starvation, which is involuntary and uncontrolled, fasting is deliberate and controlled. This distinction is vital for understanding fasting's therapeutic potential.

Simplicity and accessibility. One of fasting's greatest advantages is its simplicity. Unlike complex diets or expensive supplements, fasting is free and accessible to everyone. It simplifies life by reducing time spent on meal preparation and eating, allowing more focus on other activities.

2. Intermittent fasting can reverse type 2 diabetes and combat obesity

If metabolic diseases such as type 2 diabetes are caused by eating too much, then logically, the solution is to eat little to balance it out.

Breaking the insulin cycle. Type 2 diabetes and obesity are primarily caused by chronically elevated insulin levels. Fasting is the most effective way to lower insulin levels, allowing the body to access stored fat for energy. This breaks the cycle of insulin resistance and can lead to significant weight loss and improved metabolic health.

Powerful results. Studies and clinical experience show that intermittent fasting can:

• Reverse type 2 diabetes in a matter of weeks or months
• Lead to substantial weight loss without calorie counting
• Improve various markers of metabolic health

Superiority to traditional approaches. Fasting outperforms traditional "eat less, move more" approaches, which have a 99% failure rate for long-term weight loss. Unlike calorie restriction, which leads to metabolic slowdown, fasting maintains or even increases metabolic rate.

3. Fasting boosts brain function and slows aging through autophagy

Fasting may be considered one of the most potent anti-aging methods in existence.

Cognitive enhancement. Contrary to popular belief, fasting doesn't impair mental function. In fact, it can enhance cognitive performance by:

• Increasing mental clarity and focus
• Boosting the production of brain-derived neurotrophic factor (BDNF)
• Promoting the growth of new neurons

Cellular cleansing. Fasting triggers a process called autophagy, where cells break down and recycle old, damaged components. This "cellular cleansing" is crucial for:

• Preventing age-related cognitive decline
• Reducing the risk of neurodegenerative diseases like Alzheimer's
• Promoting overall cellular health and longevity

Hormetic stress. Fasting acts as a mild stressor that activates adaptive cellular responses, similar to exercise. This hormetic stress strengthens the body's resilience and promotes healthy aging.

4. Fasting improves heart health by reducing cholesterol and triglycerides

For people worried about heart attacks and strokes, the question is not "Why are you fasting?" but "Why are you not fasting?"

Cholesterol misconceptions. Contrary to popular belief, dietary cholesterol has little impact on blood cholesterol levels. Fasting, however, can significantly reduce LDL cholesterol and triglycerides by:

• Lowering insulin levels, which reduces the liver's production of cholesterol
• Promoting the use of stored fat for energy

Impressive results. Studies show that:

• 70 days of alternate-day fasting can reduce LDL cholesterol by 25%
• Triglyceride levels can drop by 30%
• These improvements are comparable to or better than many cholesterol-lowering medications

Beyond cholesterol. Fasting also improves other cardiovascular risk factors:

• Reduces inflammation
• Lowers blood pressure
• Improves insulin sensitivity

5. Understanding hunger is key to successful fasting

Hunger is a state of mind, not a state of stomach.

Hunger myths debunked. Many people fear overwhelming hunger during fasting, but this is largely unfounded. Key insights include:

• Hunger comes in waves and passes
• Ghrelin, the hunger hormone, typically peaks after 1-2 days of fasting, then declines
• Many report decreased hunger with extended fasting

Breaking conditioned responses. Much of our perceived hunger is due to conditioned responses to time, social cues, or environmental triggers. Fasting helps break these associations, allowing us to reconnect with true physiological hunger.

Practical strategies:

• Stay hydrated
• Consume black coffee or tea
• Stay busy to distract from hunger
• Use natural appetite suppressants like cinnamon or chia seeds

6. Various fasting protocols can be tailored to individual needs

There are many different fasting regimens, and there's no "best" one.

Intermittent fasting options:

• 16/8: 16 hours fasting, 8-hour eating window daily
• 24-hour fasts: Once or twice per week
• 5:2: 5 days normal eating, 2 days of restricted calories (500-600)
• Alternate-day fasting: Alternating between fasting and normal eating days

Extended fasting protocols:

• 36-hour fasts
• 3-7 day fasts
• 7-14 day fasts (under medical supervision)

Personalization is key. The best fasting protocol is the one you can stick to consistently. Factors to consider:

• Personal schedule and lifestyle
• Health goals (weight loss, diabetes reversal, longevity)
• Current health status and medications

7. Fasting is safe when done correctly, but certain groups should avoid it

If you feel unwell at any point during the fasting, you must stop.

Safe for most. Fasting is generally safe for healthy adults when done properly. However, certain groups should avoid fasting or consult a doctor first:

• Pregnant or breastfeeding women
• Children under 18
• Underweight individuals (BMI < 18.5)
• Those with a history of eating disorders

Medical supervision needed:

• Diabetics on medication
• People with gout
• Those on multiple medications

Safety precautions:

• Stay hydrated
• Supplement with electrolytes on longer fasts
• Break fasts if feeling unwell
• Ease into fasting gradually

8. Proper refeeding is crucial after extended fasts

Break your fast gently. The longer the fasting period, the gentler you must be.

Refeeding syndrome. This rare but potentially serious condition can occur when reintroducing food after prolonged fasting, especially in malnourished individuals. It's characterized by:

• Electrolyte imbalances
• Fluid shifts
• Metabolic abnormalities

Safe refeeding strategies:

• Start with small, easily digestible meals
• Focus on low-carb, nutrient-dense foods
• Avoid overeating
• Gradually increase portion sizes over several days

Bone broth benefit. Consuming bone broth during and after fasting can help prevent refeeding syndrome by providing essential minerals and electrolytes.

9. Fasting can enhance athletic performance and fat adaptation

Exercising in the fasted state trains your muscles to burn fat.

Fat adaptation. Fasting promotes metabolic flexibility, allowing the body to efficiently switch between burning glucose and fat for fuel. Benefits for athletes include:

• Increased endurance
• Reduced reliance on glycogen stores
• Improved recovery

Performance considerations:

• Initial performance may decrease during adaptation (1-2 weeks)
• After adaptation, performance often improves, especially for endurance activities
• Strength training can be maintained during fasting

Practical tips:

• Gradually introduce fasting into training
• Start with shorter fasts and progress slowly
• Listen to your body and adjust as needed
• Consider timing fasts around training schedule for optimal results

Last updated: August 8, 2024