Grain Brain audiobook cover - The Surprising Truth About Wheat, Carbs, and Sugar – Your Brain’s Silent Killers

Grain Brain

The Surprising Truth About Wheat, Carbs, and Sugar – Your Brain’s Silent Killers

David Perlmutter

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Health & NutritionScience

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Grain Brain
The Threat of Carbohydrates+
The Dangers of Gluten & Wheat+
The Power of Fat & Cholesterol+
Lifestyle Factors for Brain Health+

Quiz — Test Your Understanding

Question 1 of 10
Why do some medical researchers refer to Alzheimer’s disease as 'type 3 diabetes'?
  • A. Because it is a genetic condition that prevents the brain from processing artificial sweeteners.
  • B. Because it is driven by insulin resistance and inflammation caused by high carbohydrate and sugar intake.
  • C. Because it exclusively affects individuals who have already been diagnosed with severe type 1 diabetes.
  • D. Because it causes the brain to rapidly consume and deplete the body's entire supply of insulin.
Question 2 of 10
According to the text, why do people often feel a pleasurable, addictive sensation when eating gluten-rich foods like donuts or croissants?
  • A. Gluten rapidly spikes blood sugar, providing an immediate energy rush to the brain's frontal lobe.
  • B. Gluten contains trace amounts of natural sugars that directly stimulate dopamine production.
  • C. Gluten connects to morphine receptors in the brain after dissolving in the stomach.
  • D. Gluten breaks down into essential amino acids that immediately reduce oxidative stress.
Question 3 of 10
What happens to the human body when a person severely restricts their dietary cholesterol intake while consuming excessive carbohydrates?
  • A. The body goes into a constant state of cholesterol overproduction to make up for the perceived shortage.
  • B. The body effectively lowers its overall blood cholesterol levels, reducing the risk of heart disease.
  • C. The brain begins to substitute cholesterol with ketones to maintain cognitive function.
  • D. The liver completely stops producing cholesterol, relying entirely on stored visceral fat.
Question 4 of 10
How does the accumulation of visceral fat, often caused by excess sugar consumption, physically affect the brain?
  • A. It thickens the brain's frontal lobe, slowing down decision-making processes.
  • B. It produces inflammatory chemicals that correlate with a smaller hippocampus, impairing memory.
  • C. It blocks the blood-brain barrier, preventing essential vitamins from reaching brain cells.
  • D. It enlarges the amygdala, leading to increased anxiety and emotional instability.
Question 5 of 10
Which of the following lifestyle choices is explicitly mentioned in the text as a way to push DNA to produce more brain-derived neurotrophic factor (BDNF)?
  • A. Eating a diet consisting of 60 percent carbohydrates.
  • B. Restricting the amount of calories consumed.
  • C. Drinking fruit juices instead of eating whole fruits.
  • D. Sleeping for exactly six hours a night.
Question 6 of 10
How can gluten sensitivity lead to mood disorders such as depression and anxiety?
  • A. It causes the stomach to absorb too much fructose, which directly acts as a chemical depressant.
  • B. It leads to an overproduction of insulin, which drains the brain's energy reserves.
  • C. It increases the production of cytokine proteins, which block critical neurotransmitters like serotonin.
  • D. It heavily sedates the nervous system by directly mimicking anti-anxiety medications.
Question 7 of 10
What is the primary benefit of fasting or adopting a ketogenic diet for brain health?
  • A. It forces the brain to run entirely on glucose, which is its preferred and most efficient fuel source.
  • B. It encourages the brain to fuel itself with ketones, which allow brain cells to thrive and run more efficiently.
  • C. It drastically slows down the body's metabolism, preserving brain cells from natural aging.
  • D. It completely halts the process of neurogenesis, allowing the brain to rest and detoxify.
Question 8 of 10
How does sleep deprivation directly influence our dietary habits and cravings?
  • A. It lowers the levels of the hormone leptin, which increases hunger and causes cravings for high-carbohydrate foods.
  • B. It increases the production of serotonin, causing a desire for high-protein foods to maintain energy.
  • C. It spikes blood sugar levels overnight, making us crave healthy fats in the morning.
  • D. It permanently alters our DNA, removing our ability to digest dietary fats properly.
Question 9 of 10
According to the text, what was the approximate macronutrient breakdown of our human ancestors' diets?
  • A. 60 percent carbohydrates, 20 percent protein, 20 percent fat
  • B. 75 percent carbohydrates, 20 percent fat, 5 percent protein
  • C. 75 percent fat, 20 percent protein, 5 percent carbohydrates
  • D. 50 percent protein, 40 percent fat, 10 percent carbohydrates
Question 10 of 10
What did researchers discover in 2011 when comparing elderly individuals who engaged in a walking program versus those who did a stretching regimen?
  • A. The stretchers developed higher levels of BDNF because of reduced physical stress on their joints.
  • B. The walkers had larger hippocampi and higher levels of BDNF in their bloodstreams.
  • C. Both groups experienced the exact same rate of normal brain atrophy.
  • D. The walkers experienced a dangerous spike in oxidative stress, leading to cognitive decline.

Grain Brain — Full Chapter Overview

Grain Brain Summary & Overview

Grain Brain (2013) outlines how what we eat can cause or mitigate serious brain disorders like anxiety, ADHD and depression. Eating well is crucial to your brain’s functioning well, and these blinks tell you why.

Who Should Listen to Grain Brain?

  • People interested in nutrition
  • Anyone who wants to keep their brain sharp and healthy
  • Those who want to learn more about carbohydrates, sugar and gluten

About the Author: David Perlmutter

David Perlmutter is a neurologist, writer and the president of the Perlmutter Health Center. He contributes regularly to the Huffington Post, the Daily Beast and Mind Body Green. Grain Brain is his first New York Times bestseller.

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