Getting Started
New to Ray Peat's work? This page organizes his key ideas into themed sections so you can explore at your own pace. Each topic includes a summary and links to the original articles, interviews, and newsletters.
Foundations — How the Body Works
Core concepts that underpin Ray Peat's view of biology and health.
Metabolism
347 sourcesFor Ray Peat, metabolism was not simply about 'burning calories' but about the fundamental processes of energy production that determine the health or disease of every cell. He...
Learn more →
Thyroid
360 sourcesThyroid function is arguably the most central concept in Ray Peat's framework. He viewed the thyroid as the master regulator of metabolic rate and cellular energy production.
Learn more →
Respiration
244 sourcesRespiration in Ray Peat's framework refers not just to breathing but to the entire process of cellular oxygen utilization — the mitochondrial electron transport chain that...
Learn more →
Carbon dioxide
236 sourcesCarbon dioxide occupies a uniquely important place in Ray Peat's physiology. Far from being merely a metabolic waste product, Peat (following Verigo, Bohr, and others) argued that...
Learn more →
Mitochondria
194 sourcesMitochondria are central to Ray Peat's framework as the organelles responsible for oxidative phosphorylation — the efficient production of energy (ATP) from fuel. Peat viewed...
Learn more →
Hormones — Balance & Imbalance
How hormones interact and why their balance matters.
Estrogen
357 sourcesRay Peat's views on estrogen are among his most contrarian and consequential. He argued that estrogen, rather than being simply a 'female hormone,' is fundamentally a stress...
Learn more →
Progesterone
337 sourcesProgesterone holds a special place in Ray Peat's work — it was the focus of his PhD research in the late 1960s and remained central to his thinking throughout his career. Peat...
Learn more →
Cortisol
262 sourcesRay Peat viewed cortisol as one of the key stress hormones whose chronic elevation drives aging and disease. While cortisol serves essential functions in acute stress (mobilizing...
Learn more →
Prolactin
98 sourcesRay Peat identified prolactin as an underrecognized stress hormone with wide-ranging harmful effects. While best known for its role in lactation, prolactin is released under...
Learn more →
Serotonin
215 sourcesRay Peat's view of serotonin is one of his most radical departures from mainstream thinking. While popular culture and psychiatry treat serotonin as a 'happiness molecule' whose...
Learn more →
Nutrition — Food as Medicine
Peat's perspective on diet, macronutrients, and specific foods.
Sugar
320 sourcesIn stark contrast to mainstream dietary advice, Ray Peat argued that sugar — particularly the combination of glucose and fructose found in fruits, honey, and white sugar — is...
Learn more →
Calcium
230 sourcesRay Peat's views on calcium challenge both the mainstream recommendation to take calcium supplements and the alternative health community's fear of calcium. He argued that calcium...
Learn more →
Polyunsaturated fats
286 sourcesRay Peat's position on polyunsaturated fatty acids (PUFAs) is perhaps his most well-known and controversial stance. He argued that the so-called 'essential fatty acids' — linoleic...
Learn more →
Gelatin
147 sourcesRay Peat promoted gelatin (and its parent protein, collagen) as a counterbalance to the excess muscle meat in modern diets. He noted that muscle meat is high in tryptophan and...
Learn more →
Coconut oil
146 sourcesCoconut oil holds a special place in Ray Peat's dietary recommendations. Its medium-chain fatty acids (lauric, capric, caprylic acid) are metabolized differently from long-chain...
Learn more →
Protein
322 sourcesRay Peat's views on protein emphasize quality and balance over quantity. He recommended moderate protein intake (around 80-100g daily) from a mix of sources, with particular...
Learn more →
Protective Substances
Supplements and common substances Peat considered protective.
Aspirin
166 sourcesRay Peat regarded aspirin as one of the most valuable and underappreciated medicines. Beyond its well-known pain-relieving and anti-inflammatory effects, Peat documented evidence...
Learn more →
Vitamin d
165 sourcesRay Peat viewed vitamin D as an important hormone precursor but warned against the supplementation craze. He noted that vitamin D is produced from cholesterol in the skin with...
Learn more →
Vitamin e
152 sourcesRay Peat considered vitamin E one of the most important protective nutrients, primarily because of its ability to prevent lipid peroxidation of polyunsaturated fats. Since modern...
Learn more →
Caffeine
136 sourcesRay Peat was an advocate for coffee and caffeine, viewing them as metabolically supportive. He argued that caffeine supports cellular respiration, opposes adenosine (a metabolic...
Learn more →
Magnesium
143 sourcesRay Peat considered magnesium one of the most important minerals for metabolic health, essential for energy production, nerve and muscle function, and cardiovascular health. He...
Learn more →
Health & Aging
Degenerative processes and how Peat approached them.
Aging
377 sourcesRay Peat viewed aging not as an inevitable genetic program but as an accumulation of metabolic damage — primarily from the interaction of polyunsaturated fats, iron, estrogen, and...
Learn more →
Cancer
347 sourcesRay Peat's understanding of cancer drew heavily on Otto Warburg's discovery that cancer cells ferment glucose even in the presence of oxygen (aerobic glycolysis). Peat viewed...
Learn more →
Inflammation
349 sourcesIn Ray Peat's framework, inflammation is not simply an immune response to infection or injury but a fundamental metabolic state characterized by increased estrogen, serotonin,...
Learn more →
Stress
374 sourcesRay Peat's concept of stress extends far beyond the popular understanding of 'feeling stressed.' Drawing on Hans Selye's work, Peat described stress as any factor that shifts the...
Learn more →
Brain
364 sourcesRay Peat emphasized that the brain is the most metabolically active organ and therefore the most vulnerable to metabolic insufficiency. He challenged several dogmas: that brain...
Learn more →