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Grain Brain

Grain Brain

The Surprising Truth about Wheat, Carbs, and Sugar — Your Brain's Silent Killers
by David Perlmutter 2013 336 pages
3.9
23k+ ratings
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Key Takeaways

1. Carbohydrates and gluten are silent brain destroyers

Gluten is our generation's tobacco.

Gluten sensitivity is widespread. Up to 40% of people can't properly process gluten, and the remaining 60% could be at risk. Gluten sensitivity goes beyond celiac disease, affecting the brain and nervous system even without digestive symptoms. It can lead to inflammation, which is linked to various neurological disorders including ADHD, anxiety, depression, and dementia.

Carbohydrates spike blood sugar. This triggers insulin release, leading to insulin resistance over time. Chronically high blood sugar levels cause protein glycation, damaging brain tissues. Even "healthy" whole grains can have a higher glycemic index than table sugar, contributing to this problem.

  • Common neurological symptoms of gluten sensitivity:
    • Headaches and migraines
    • Brain fog and difficulty concentrating
    • Mood disorders
    • Movement disorders
  • Hidden sources of gluten:
    • Processed foods
    • Cosmetics and personal care products
    • Medications and supplements

2. Fat is brain food: Cholesterol and saturated fats are essential

The brain is a far more open system than we ever imagined, and nature has gone very far to help us perceive and take in the world around us. It has given us a brain that survives in a changing world by changing itself.

The brain thrives on fat. Over 70% of the brain is composed of fat. Cholesterol is crucial for brain function, forming cell membranes and facilitating neurotransmission. Contrary to popular belief, high cholesterol levels are associated with better cognitive function and longevity in older adults.

Saturated fats are not the enemy. They play vital roles in the body, including brain health. The vilification of saturated fats and cholesterol has led to the overconsumption of carbohydrates, contributing to the rise in obesity, diabetes, and neurological disorders.

  • Benefits of dietary fats for the brain:
    • Improved memory and cognitive function
    • Reduced risk of neurodegenerative diseases
    • Enhanced mood and mental well-being
  • Healthy sources of fats:
    • Avocados
    • Nuts and seeds
    • Olive oil
    • Grass-fed meats
    • Wild-caught fatty fish

3. Sugar's toxic effect on the brain goes beyond empty calories

We are designed to be smart people our entire lives. The brain is supposed to work well until our last breath.

Sugar triggers inflammation. Excess sugar consumption leads to chronic inflammation in the body, including the brain. This inflammatory response can damage neurons and contribute to cognitive decline over time.

Advanced glycation end products (AGEs) harm the brain. When sugar molecules attach to proteins in the body, they form AGEs. These compounds can damage brain tissues, leading to accelerated aging and increased risk of neurodegenerative diseases.

  • Effects of sugar on the brain:
    • Impaired memory and learning
    • Increased risk of depression and anxiety
    • Accelerated cognitive decline
    • Potential link to Alzheimer's disease
  • Hidden sources of sugar:
    • Fruit juices and smoothies
    • Low-fat products
    • Condiments and sauces
    • "Healthy" snack bars

4. Lifestyle choices can alter gene expression and brain health

We can change the expression of more than 70 percent of the genes that have a direct bearing on our health and longevity.

Epigenetics empowers us. Our genes are not our destiny. Through lifestyle choices, we can influence the expression of genes related to brain health and longevity. This includes diet, exercise, stress management, and sleep habits.

Neuroplasticity allows for brain regeneration. The brain can create new neurons and neural connections throughout life. This process, called neurogenesis, can be enhanced through lifestyle factors, particularly diet and exercise.

  • Lifestyle factors that influence gene expression:
    • Nutrition (especially omega-3 fatty acids and antioxidants)
    • Physical activity
    • Stress reduction techniques (e.g., meditation)
    • Social connections
  • Ways to promote neurogenesis:
    • Engaging in novel experiences
    • Learning new skills
    • Consuming foods rich in flavonoids and omega-3s
    • Fasting or caloric restriction

5. Exercise is crucial for cognitive function and neuroplasticity

Exercise has numerous pro-health effects on the body—especially on the brain. It's a powerful player in the world of epigenetics.

Physical activity boosts BDNF production. Brain-derived neurotrophic factor (BDNF) is crucial for neuroplasticity and cognitive function. Exercise, particularly aerobic activities, increases BDNF levels in the brain, promoting the growth of new neurons and strengthening existing connections.

Regular exercise protects against cognitive decline. Studies show that people who exercise regularly have larger hippocampi (the brain's memory center) and perform better on cognitive tests. Exercise also reduces the risk of neurodegenerative diseases like Alzheimer's and Parkinson's.

  • Benefits of exercise for brain health:
    • Improved memory and learning
    • Enhanced mood and reduced risk of depression
    • Increased focus and attention
    • Better sleep quality
  • Recommended exercise regimen:
    • At least 150 minutes of moderate aerobic activity per week
    • Strength training exercises 2-3 times per week
    • Regular stretching and balance exercises

6. Quality sleep is vital for brain health and hormone regulation

We are all members of the same society that relies on "experts" to tell us what's good and, conversely, bad for us.

Sleep deprivation disrupts hormone balance. Lack of sleep affects crucial hormones like leptin and ghrelin, which regulate appetite and metabolism. This can lead to weight gain and increased risk of metabolic disorders, indirectly impacting brain health.

Restorative sleep is essential for brain function. During sleep, the brain consolidates memories, clears toxins, and repairs cellular damage. Chronic sleep deprivation is linked to increased risk of cognitive decline and neurodegenerative diseases.

  • Effects of sleep deprivation on the brain:
    • Impaired decision-making and problem-solving
    • Decreased creativity and emotional regulation
    • Increased risk of mood disorders
    • Accelerated brain aging
  • Tips for improving sleep quality:
    • Maintain a consistent sleep schedule
    • Create a relaxing bedtime routine
    • Limit exposure to blue light before bed
    • Optimize sleep environment (cool, dark, quiet)

7. A grain-free, high-fat diet can prevent and reverse brain disorders

The fate of your brain is not in your genes. It's not inevitable. And if you're someone who suffers from another type of brain disorder, such as chronic headaches, depression, epilepsy, or extreme moodiness, the culprit may not be encoded in your DNA. It's in the food you eat.

The Grain Brain diet emphasizes healthy fats and proteins. This approach aims to reduce inflammation, stabilize blood sugar, and provide essential nutrients for brain health. It involves eliminating gluten and drastically reducing carbohydrate intake while increasing consumption of healthy fats and proteins.

Many neurological conditions respond to dietary changes. Conditions such as ADHD, anxiety, depression, and even some cases of epilepsy have shown improvement or complete resolution with the adoption of a grain-free, high-fat diet. This approach can also help prevent cognitive decline and reduce the risk of neurodegenerative diseases.

  • Key components of the Grain Brain diet:
    • Elimination of gluten and refined carbohydrates
    • Emphasis on healthy fats (e.g., avocados, nuts, olive oil)
    • Moderate protein intake from quality sources
    • Abundant non-starchy vegetables
  • Potential benefits of the Grain Brain approach:
    • Improved cognitive function and mental clarity
    • Reduced inflammation throughout the body
    • Better blood sugar control and insulin sensitivity
    • Weight loss and improved metabolic health

Last updated:

Review Summary

3.9 out of 5
Average of 23k+ ratings from Goodreads and Amazon.

Grain Brain received mixed reviews. Some readers found it informative and life-changing, praising its insights on the effects of carbohydrates and gluten on brain health. They appreciated the scientific evidence and practical advice provided. However, critics found the book's claims exaggerated and lacking balance, arguing that it oversimplifies complex nutritional issues. Some felt the author's stance against grains was too extreme. Despite the polarizing opinions, many readers reported positive health changes after following the book's recommendations, particularly regarding energy levels and cognitive function.

Your rating:

About the Author

Dr. David Perlmutter is a renowned neurologist and bestselling author. He graduated from the University of Miami School of Medicine and has published extensively in peer-reviewed journals. Dr. David Perlmutter has authored several New York Times bestsellers, including "Grain Brain," which has been translated into 34 languages. He frequently lectures at prestigious institutions and has appeared on numerous national television programs. Dr. Perlmutter has received several awards for his innovative approaches to neurological disorders, including the Linus Pauling Award and the National Nutritional Foods Association Clinician of the Year Award. He serves on the Board of Directors and is a Fellow of the American College of Nutrition.

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