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Dark Calories

Dark Calories

How Vegetable Oils Destroy Our Health and How We Can Get It Back
by Cate Shanahan 2024 356 pages
4.45
100+ ratings
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Key Takeaways

1. Vegetable oils are toxic, inflammatory, and pervasive in our food supply

"Remember, vegetable oil's tendency to oxidize has implications for everyday aspects of life that medical science has ignored. The implications are vast and profound."

Ubiquitous toxins: Vegetable oils, or seed oils, are found in over 80% of processed foods. These oils are high in polyunsaturated fatty acids (PUFAs), which are highly unstable and prone to oxidation. When heated or exposed to oxygen, PUFAs break down into toxic compounds that promote inflammation and oxidative stress in the body.

Historical context: Vegetable oils are a relatively recent addition to the human diet, introduced in the late 19th century as industrial byproducts. Unlike traditional fats like butter, lard, and olive oil, which humans have consumed for millennia, our bodies are not well-adapted to processing these industrial oils.

Health implications:

  • Promote chronic inflammation
  • Contribute to heart disease, diabetes, and cancer
  • Disrupt cellular function and energy production
  • Damage mitochondria, the powerhouses of our cells
  • Impair brain function and mental health

2. High-PUFA body fat disrupts metabolism and drives insulin resistance

"The moment he saw how ketones helped his epileptic rats, a genius idea had popped into his head. Why not try a keto diet for cancer?"

Metabolic disruption: Consuming high amounts of vegetable oils leads to the accumulation of PUFA-rich body fat. This inflammatory fat fails to provide efficient energy to our cells, forcing them to rely more heavily on glucose for fuel.

Insulin resistance pathway:

  1. High-PUFA body fat fails to energize cells properly
  2. Cells increase their demand for glucose
  3. Blood sugar levels become unstable
  4. The body adapts by raising baseline blood sugar and insulin levels
  5. Insulin resistance develops, leading to metabolic syndrome and type 2 diabetes

Consequences: This metabolic shift towards sugar dependency creates a vicious cycle of energy crashes, cravings, and overeating. It also promotes weight gain, chronic disease, and accelerated aging.

3. Cholesterol is essential for health, not a dangerous substance

"Cholesterol is the body's equivalent of duct tape. It's one of the most versatile nutrients our cells have and they use it for solving all sorts of problems."

Vital nutrient: Cholesterol is crucial for numerous bodily functions, including:

  • Cell membrane structure and function
  • Hormone production (including sex hormones and cortisol)
  • Vitamin D synthesis
  • Brain health and cognitive function
  • Antioxidant protection

Misunderstood molecule: The fear of cholesterol stems from a flawed understanding of its role in heart disease. In reality, cholesterol is part of the body's repair system, not the cause of arterial damage.

Cholesterol paradox: Low cholesterol levels are associated with increased risk of:

  • Cancer
  • Infections
  • Mental health disorders
  • Cognitive decline
  • Overall mortality

4. The cholesterol theory of heart disease lacks scientific foundation

"If having higher cholesterol really did cause heart attacks, then people hospitalized for a heart attack would have had high cholesterol levels before their attack."

Flawed hypothesis: The idea that high cholesterol causes heart disease is based on weak correlations and manipulated data, primarily from the work of Ancel Keys in the 1950s and 1960s.

Suppressed evidence:

  • The Minnesota Coronary Experiment (1968-1973) showed that lowering cholesterol with vegetable oils increased mortality
  • Data linking smoking to heart disease was downplayed to maintain focus on the cholesterol theory

Alternative explanations:

  • Oxidative stress and inflammation are more likely culprits in heart disease
  • Oxidized LDL, not total cholesterol, is associated with arterial plaque formation
  • Smoking, sugar consumption, and vegetable oil intake correlate more strongly with heart disease rates

5. Statins and other cholesterol-lowering drugs may do more harm than good

"Statins lower cholesterol quite indirectly, by blocking one of the enzymes involved in building cholesterol molecules at a point much earlier in the process than the now defunct triparanol."

Mechanism of action: Statins inhibit the production of mevalonate, a precursor to cholesterol and other essential molecules like CoQ10, which is crucial for cellular energy production.

Side effects:

  • Muscle pain and weakness
  • Cognitive impairment and memory loss
  • Increased risk of diabetes
  • Liver damage
  • Mood changes and irritability

Questionable benefits:

  • Absolute risk reduction for heart attacks is minimal (often less than 1%)
  • No proven increase in overall life expectancy
  • Benefits are often overstated using relative risk reduction statistics

6. The American Heart Association's dietary advice is compromised by conflicts of interest

"The AHA had just partnered up with vegetable oil."

Historical context: In 1948, the American Heart Association (AHA) received a large donation from Procter & Gamble, a major producer of vegetable oils. This marked the beginning of the AHA's promotion of vegetable oils as "heart-healthy."

Ongoing conflicts:

  • The AHA continues to receive funding from industries that benefit from its dietary recommendations
  • Many AHA-affiliated researchers have financial ties to food and pharmaceutical companies

Consequences:

  • Perpetuation of the cholesterol theory despite contradictory evidence
  • Continued promotion of vegetable oils and low-fat diets
  • Resistance to updating dietary guidelines based on new research

7. A diet rich in traditional fats and low in seed oils can reverse chronic diseases

"If you want to protect yourself from cancer starting today, there is a clear path forward: keep your mitochondria as healthy as possible."

Ancestral wisdom: Traditional diets around the world emphasize nutrient-dense animal foods and natural fats, which support optimal health and longevity.

Four Pillars of a Human Diet:

  1. Eat fresh, unprocessed foods
  2. Include slow-cooked bone and joint tissues (e.g., bone broth)
  3. Consume fermented and sprouted foods
  4. Eat nose-to-tail, utilizing all parts of animals

Potential benefits:

  • Improved insulin sensitivity and blood sugar control
  • Reduced inflammation and oxidative stress
  • Enhanced mitochondrial function
  • Better brain health and cognitive performance
  • Potential cancer prevention and treatment support

8. Metabolic flexibility is key to optimal health and energy levels

"When we are metabolically healthy, we can tolerate a wider range of macros."

Definition: Metabolic flexibility is the ability to efficiently switch between burning fat and carbohydrates for fuel, depending on availability and energy demands.

Importance:

  • Stable energy levels throughout the day
  • Improved body composition and weight management
  • Enhanced athletic performance and recovery
  • Reduced risk of chronic diseases

Achieving metabolic flexibility:

  • Eliminate seed oils from the diet
  • Incorporate healthy fats (saturated and monounsaturated)
  • Consume adequate protein from whole food sources
  • Include slow-digesting carbohydrates as needed
  • Practice intermittent fasting or time-restricted eating

9. Cutting seed oils can improve mental health and cognitive function

"Low brain energy is known to impair our self-control and cognitive functions, and can even promote violence and mental illness."

Brain-body connection: The same metabolic dysfunction caused by seed oils that affects our physical health also impacts our mental well-being.

Potential improvements:

  • Enhanced mood stability
  • Reduced anxiety and depression
  • Better focus and concentration
  • Improved memory and learning
  • Increased willpower and self-control

Emerging research: The field of metabolic psychiatry is exploring how dietary interventions, particularly ketogenic diets and seed oil elimination, can support mental health treatment.

10. Practical strategies for eliminating seed oils from your diet

"Avoid anything deep fried."

Read labels: Check ingredient lists for the "Hateful Eight" seed oils: corn, canola, cottonseed, soy, sunflower, safflower, grapeseed, and rice bran oil.

Cook at home: Use healthy cooking fats like butter, ghee, coconut oil, olive oil, and animal fats.

Dining out tips:

  • Choose grilled, baked, or steamed options over fried foods
  • Ask for dishes to be cooked in butter instead of vegetable oil
  • Opt for simple, whole food-based meals

Two-Week Challenge: Commit to eliminating seed oils for two weeks to experience the benefits firsthand. Focus on:

  • Whole, unprocessed foods
  • Quality protein sources
  • Healthy fats
  • Slow-digesting carbohydrates

By making these changes, you can significantly improve your health, energy levels, and overall well-being while reducing your risk of chronic diseases.

Last updated:

FAQ

What's Dark Calories about?

  • Focus on Vegetable Oils: Dark Calories by Cate Shanahan examines the negative health impacts of vegetable oils, which are often mistakenly considered healthy. The book argues that these oils contribute to chronic diseases due to their high polyunsaturated fatty acid (PUFA) content.
  • Historical Context: Shanahan explores the history of vegetable oils, detailing their rise in the American diet and the misinformation about their health benefits. The book highlights the influence of the vegetable oil industry on medical guidelines.
  • Call to Action: The author provides practical advice on eliminating vegetable oils from your diet and replacing them with healthier fats. The goal is to empower readers to make informed dietary choices for better health.

Why should I read Dark Calories?

  • Health Awareness: The book is crucial for those interested in understanding the hidden dangers of common dietary fats. It challenges widely accepted nutritional beliefs and promotes critical thinking about food choices.
  • Scientific Insights: Shanahan presents scientific research and personal anecdotes illustrating the harmful effects of vegetable oils. Readers will learn how these oils contribute to inflammation and chronic diseases.
  • Practical Guidance: The book offers actionable steps to improve your diet, including meal planning and recipes that avoid vegetable oils. It serves as a valuable resource for enhancing overall well-being.

What are the key takeaways of Dark Calories?

  • Vegetable Oils Are Harmful: The book emphasizes that vegetable oils are not the healthy alternatives they are marketed to be. They are linked to oxidative stress, inflammation, and chronic diseases.
  • Cholesterol Misconceptions: Shanahan challenges the vilification of cholesterol, suggesting that higher levels can be associated with better health outcomes. This contradicts the conventional wisdom that low cholesterol is always desirable.
  • Empowerment Through Knowledge: The author encourages readers to educate themselves about nutrition and make informed dietary choices. Understanding the science behind food can help individuals reclaim their health.

What specific method does Dark Calories recommend for improving health?

  • Eliminate Vegetable Oils: Shanahan advocates for completely removing vegetable oils from the diet. She identifies the "Hateful Eight" oils to avoid, including corn, canola, and soybean oils.
  • Focus on Traditional Fats: The book suggests replacing vegetable oils with traditional fats like butter, lard, and coconut oil. These fats are more stable and less prone to oxidation, supporting metabolic health.
  • Two-Week Challenge: Shanahan introduces a two-week challenge to help readers detox from vegetable oils. This includes meal planning and simple recipes to facilitate the transition to a cleaner diet.

What are the best quotes from Dark Calories and what do they mean?

  • “Came from a plant, eat it; was made in a plant, don’t.”: This quote encapsulates the book's philosophy on food choices, urging readers to prioritize whole, natural foods over processed ones.
  • “Vegetable oil is oxidative stress in a bottle.”: This statement highlights the core argument that vegetable oils contribute to oxidative stress, linked to numerous health issues.
  • “The sicker you get, the richer they grow.”: This quote reflects the author's critique of the healthcare and pharmaceutical industries, suggesting that chronic diseases financially benefit these sectors.

How do vegetable oils affect our metabolism according to Dark Calories?

  • Promote Insulin Resistance: Shanahan explains that the high PUFA content in vegetable oils can lead to insulin resistance, disrupting normal metabolic processes and potentially leading to weight gain and diabetes.
  • Energy Production Issues: The book discusses how inflammatory body fat from vegetable oil consumption fails to provide adequate energy to cells, causing sugar cravings and poor dietary choices.
  • Oxidative Stress: Vegetable oils contribute to oxidative stress, damaging cells and impairing their function. This oxidative damage is linked to chronic diseases like heart disease and diabetes.

What is the relationship between cholesterol and vegetable oils in Dark Calories?

  • Cholesterol as a Nutrient: Shanahan argues that cholesterol is vital for bodily functions, including hormone production and cell membrane integrity. The book challenges the notion that high cholesterol is inherently bad.
  • Vegetable Oils Lower Cholesterol: While vegetable oils can lower cholesterol levels, this may not be beneficial. Lower cholesterol is often associated with poorer health outcomes, suggesting a complex relationship.
  • Misguided Dietary Guidelines: The book critiques dietary guidelines promoting low cholesterol and high vegetable oil consumption, arguing they are based on flawed science.

What are the "Hateful Eight" oils mentioned in Dark Calories?

  • List of Oils: The "Hateful Eight" includes corn, canola, cottonseed, soybean, sunflower, safflower, grapeseed, and rice bran oils. These oils are criticized for their negative health effects.
  • Health Risks: Shanahan argues that these oils contribute to inflammation, metabolic disorders, and chronic diseases due to their high PUFA content.
  • Avoidance Strategy: The book provides strategies for avoiding these oils, such as reading labels and choosing healthier alternatives, crucial for improving health.

How does Dark Calories address the history of dietary recommendations?

  • Conflict of Interest: Shanahan discusses how the American Heart Association promoted vegetable oils after receiving funding from the industry, raising questions about the integrity of dietary recommendations.
  • Ancel Keys and the Diet-Heart Hypothesis: The book examines Ancel Keys' role in shaping the cholesterol narrative, leading to the demonization of saturated fats and promotion of vegetable oils.
  • Evolution of Guidelines: Shanahan outlines how dietary guidelines have changed, often due to industry pressures rather than solid scientific evidence, helping readers understand current nutrition science.

How does Dark Calories redefine the role of cholesterol in our diet?

  • Cholesterol as Essential: Shanahan posits that cholesterol is vital for bodily functions, challenging the view that it is solely a heart disease risk factor.
  • Dietary Recommendations: The book encourages consuming cholesterol-rich foods like eggs and dairy, often demonized in conventional diets, for better health outcomes.
  • Personal Experiences: Shanahan shares anecdotes illustrating how patients improved their health by embracing cholesterol, reinforcing the importance of dietary fat.

How can I start implementing the advice from Dark Calories?

  • Read Labels Carefully: Begin by checking ingredient labels for vegetable oils and avoid products containing them, including many processed foods and snacks.
  • Cook with Traditional Fats: Replace vegetable oils with traditional fats like butter, ghee, lard, and coconut oil, which are more stable and less likely to oxidize.
  • Join the Two-Week Challenge: Participate in the two-week challenge to detox from vegetable oils, focusing on whole, nutrient-dense foods for a smooth transition.

What role do personal stories play in Dark Calories?

  • Real-Life Examples: Shanahan shares personal anecdotes and patient stories to illustrate the transformative power of dietary changes, making scientific concepts relatable.
  • Motivation for Change: These narratives motivate readers by showing that significant health improvements are possible through dietary adjustments.
  • Building Community: Sharing these experiences fosters a sense of community among those seeking to improve their health, serving as a powerful motivator.

Review Summary

4.45 out of 5
Average of 100+ ratings from Goodreads and Amazon.

Dark Calories receives overwhelmingly positive reviews, with readers praising its informative content on the dangers of seed oils in modern diets. Many describe it as life-changing and eye-opening, highlighting the book's detailed explanations of how vegetable oils impact health. Readers appreciate Dr. Shanahan's thorough research, historical context, and practical advice for avoiding harmful oils. Some note the controversial nature of the information presented, but most find it compelling and valuable. Overall, reviewers recommend the book as essential reading for anyone interested in improving their health through nutrition.

Your rating:

About the Author

Dr. Catherine Shanahan is a physician specializing in nutrition and its effects on health. She has written multiple books on the subject, including Deep Nutrition and Dark Calories. Dr. Shanahan's work focuses on traditional diets and their role in preventing chronic diseases prevalent in modern societies. She has gained recognition for her research on the negative health impacts of vegetable oils and seed oils in the American diet. Dr. Shanahan's approach combines medical expertise with nutritional science, offering readers practical advice for improving their health through dietary changes. Her books are known for being well-researched yet accessible to the general public.

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