Overview
A genuinely healthy organism handles infections, injuries, and irritants without producing the swelling, redness, pain, and tissue damage that get labeled as "inflammation". The 20th century medical tradition, following Erlich's idea of immunity as killing invaders, treated inflammation as a useful response. The older and more accurate view, going back to Metchnikoff, treated the immune system as a developmental process that maintains the integrity of the organism. All of the major degenerative diseases (heart disease, Alzheimer's, Parkinson's, arthritis, cancer, diabetes) are now recognized as inflammatory processes, and aging itself is an exaggerated inflammation. The substrate that turns small stresses into runaway inflammation is polyunsaturated fat in the tissues, and the most reliable way to suppress chronic inflammation is to remove the things that drive it (PUFA, endotoxin, estrogen, serotonin, nitric oxide, lactic acid) while supporting energy production with thyroid, sugar, and saturated fats.
Key Points
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Inflammation is what a healthy body does not experience. A genuinely healthy person catching the same virus, suffering the same wound, or eating the same irritant does not produce the inflammatory cascade that sicker people produce. The body is complexly designed not to go wrong, and the degree of inflammation a person experiences corresponds directly to their state of health. Once a person is in an inflamed state, every additional stressor (a virus, a bad meal, a cold draft) compounds the damage. In a sound system, those same exposures would pass without notice.
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Polyunsaturated fat is the substrate that converts small stresses into large inflammatory reactions. Rats raised on a PUFA-free diet are tremendously resistant to inflammation and dying, even when subjected to crude trauma like being held by the tail and whacked on furniture. Rats on a standard PUFA-rich diet given the same treatment go into shock and die. The stored polyunsaturated fats in the tissues become the precursors for prostaglandins, leukotrienes, and other inflammatory mediators, so any small trigger such as hypoglycemia can set off a cascade that would not occur in a PUFA-depleted organism. From age 20 to 40, most people roughly double the PUFA content of their tissues, which is why injuries heal with more scarring and slower as people age.
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Endotoxin from intestinal bacteria is the chronic background source of inflammation. Lipopolysaccharide leaks from the bacteria in the lower intestine and reaches the liver continuously. When the liver is healthy and not overworked, it neutralizes the endotoxin before it reaches systemic circulation. Under stress, with low thyroid, too much PUFA or bowel dysbiosis, more endotoxin escapes into the bloodstream. It then directly disrupts cell membranes, triggers serotonin and nitric oxide release, blocks mitochondrial energy production, and forces a shift to lactic acid metabolism. Antibiotics or a daily raw carrot have repeatedly been shown to drop estrogen and cortisol while raising progesterone within days, by reducing endotoxin absorption.
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Serotonin, histamine, nitric oxide, and prostaglandins are the central inflammatory mediators, and they amplify each other. Endotoxin stimulates serotonin release; serotonin triggers nitric oxide; nitric oxide blocks cytochrome oxidase and forces lactic acid production; lactic acid drives more stress hormones; stress hormones liberate more free fatty acids, which feed prostaglandin production. About 95% of the body's serotonin is produced in the intestine, which is why digestive irritation reaches every other organ. Nitric oxide poisons mitochondrial respiration in the same way as cyanide and carbon monoxide, and chronic excess leads to diabetes, cardiovascular degeneration, and neurodegeneration.
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Estrogen is a basic pro-inflammatory activator. Estrogen amplifies the toxic effects of polyunsaturated fats and is amplified by them in turn. It stimulates prolactin, increases the production of nitric oxide and prostaglandins, drives the aromatase enzyme that creates more estrogen in stressed tissues, and slows the liver's ability to detoxify both itself and other inflammatory factors. The endometriosis cycle illustrates the loop: estrogen turns on cyclooxygenase in the endometrium, which converts PUFA to prostaglandins, which create inflammation, which then induces more aromatase and more estrogen.
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Aspirin and vitamin E are the most reliable anti-inflammatory substances Ray recommends. Aspirin blocks prostaglandin synthesis from polyunsaturated fats, lowers ACTH and therefore cortisol, has antiviral and anticarcinogenic effects, and acts as a mild laxative because it suppresses nitric oxide. Vitamin E is anti-estrogenic and acts at several levels to block prostaglandin formation; the Italian researchers in the 1940s called it the "progesterone-sparing vitamin" because it preserves both fertility and progesterone function. Doses of 200 to 300 milligrams of aspirin daily are reasonable for routine use; 6,000 to 7,000 milligrams (about 20 standard tablets) have been used for serious chronic inflammatory problems, with vitamin K supplementation to protect against bleeding (1mg per roughly 325mg of aspirin).
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Progesterone is the body's most powerful natural anti-inflammatory hormone. During gestation the fetus is bathed in extremely high progesterone, which is part of why prenatal injuries heal without scars or inflammation. Progesterone has the same anti-inflammatory range as cortisol but without the catabolic side effects. It blocks prostaglandin synthesis, restores mitochondrial energy production and stabilizes cells. Progesterone rises sharply during the second half of the menstrual cycle and is heavily produced by the placenta during pregnancy. Pregnenolone, DHEA, and testosterone share many of these stabilizing properties.
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Cortisol is anti-inflammatory in the short term but devastating chronically. Within two or three hours of a big dose of cortisol or a synthetic glucocorticoid, the thymus, skin, and muscles begin shrinking. Long-term use weakens blood vessels (causing easy bruising and petechial hemorrhages), thins skin, drives osteoporosis and stroke, and shifts metabolism toward the estrogenic side. Asthmatics and eczema patients put on cortisone inhalers and creams for years end up with progressively worse underlying inflammation because the stress hormone has overwhelmed the protective effects of testosterone and progesterone.
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Carbon dioxide is anti-inflammatory; lactic acid is inflammatory. When mitochondria run efficiently they produce CO2, which relaxes blood vessels in proportion to the tissue's actual energy needs and suppresses free radical damage. When energy production stalls, glucose is converted to lactic acid instead of being fully oxidized, and lactic acid drives cortisol production, prostaglandin formation, collagen deposition, and the whole inflammatory cascade. High altitude, with its lower oxygen tension, paradoxically protects against inflammation by raising tissue CO2. Hypoventilation during surgery (allowing CO2 to build up slightly) reduces inflammation and improves outcomes.
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The protective steroids actively oppose the inflammatory cascade. Progesterone directly blocks the cortisol receptor, inhibits aromatase, and is anti-inflammatory in its own right. DHEA inhibits the enzyme that synthesises cortisol while activating the enzyme that degrades it, and is anti-inflammatory at the receptor level. Pregnenolone has effects similar to both. Vitamin D is technically a "secosteroid" with anti-inflammatory effects parallel to progesterone, including reducing spontaneous abortion risk and controlling inflammation broadly.
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PUFA peroxidation produces aldehydes that are confirmed human carcinogens. Malondialdehyde was added to the NIH list of known human carcinogens around 2010 and represents about 80% of aldehydes produced from PUFA breakdown. Other aldehydes like 4-hydroxynonenal are now biomarkers for Alzheimer's, Parkinson's, and multiple sclerosis. Lipid peroxidation of PUFA produces protein damage from advanced glycation end-products 23 times faster than simple sugars do. Around 80% of arterial plaque consists of a peroxidation byproduct of linoleic acid.
Notable Quotes
"It's what a healthy person who catches, for example, the COVID virus does not experience. Their immune system makes them totally unaware that there has been a virus in their body."
[Ray Peat — What is Inflammation?]
"The prenatal functioning of the immune system is what Metchnikoff and Cunliffe were talking about. It's keeping the integrity of the organism and not worrying about the process of killing invaders."
[Ray Peat — Inflammation]
"Aging, in all of its aspectsm, involves inflammation rather than simply cleaning up the mess quietly"
[Ray Peat — Inflammation]
"Estrogen is a basic pro-inflammatory activator. Vitamin E as a very essential anti-estrogen factor is also a very fundamental anti-inflammatory agent."
[Ray Peat — Life, Energy, Estrogen, Fibrosis]
"Both of these things, low immune response and chronic low grade inflammation, are now known to be one of the causes, if not the cause, of almost every chronic, serious condition that we are aware of."
[Georgi Dinkov — How To Naturally Lower Cortisol And Optimize Your Health]
Important Things To Consider
Synthetic glucocorticoids should not be used chronically. Cortisol creams, inhalers, and oral steroids work in the short term but switch off the protective testosterone and progesterone effects, accelerate skin and muscle thinning, weaken blood vessels, and progress to osteoporosis and stroke if continued for years. Aspirin, vitamin E, progesterone, and addressing the underlying cause are safer long-term approaches.
Aspirin requires vitamin K coverage at higher doses. A single milligram of vitamin K per 325 milligram aspirin tablet is roughly the protective ratio. People who have taken antibiotics may have lost the intestinal bacteria that produce vitamin K, making them more susceptible to aspirin's anti-clotting effect. Cooked greens (kale, collards), aged cheese, and liver are the best dietary sources.
Most "good" prostaglandins turn out to be harmful too. The drug industry promoted a yin-yang theory of good and bad prostaglandins, but as evidence accumulated, the supposedly beneficial ones were also found to cause pain, atrophy or inflammation and some were found to suppress progesterone production. Not having any of the ordinary prostaglandins is better than trying to balance them.
Nitric oxide supplements (arginine, citrulline) are sold as if NO is beneficial, but it is one of the central inflammatory mediators. Viagra's marketing rehabilitated nitric oxide's reputation in the late 1990s after a decade of research showing it kills pancreatic insulin-producing cells, damages every tissue it touches, and acts as a free radical analogous to cyanide and carbon monoxide. The supplement industry took up the same line. There are safer ways to dilate blood vessels: keeping CO2 up does it in proportion to actual tissue need.
Coconut oil and saturated fats are anti-inflammatory in their own right. Saturated fats inhibit the stress reaction (which is self-limiting if your tissues are predominantly saturated), suppress bacterial growth in the intestine, protect mitochondria from PUFA-driven damage, and provide energy without becoming substrates for prostaglandin formation. Coconut oil has enough short-chain saturated fatty acids that they are taken up preferentially and protect the mitochondria from stress-released PUFA.
Hypoglycemia by itself can start a prostaglandin cascade. Anytime blood sugar falls, adrenaline and cortisol rise, free fatty acids are liberated from fat tissue, and if the tissues contain stored PUFA, prostaglandin formation begins. Eating regularly with adequate sugar and protein, and eating breakfast soon after waking, prevents this kind of routine inflammation.
The "essential fatty acid" doctrine is wrong; humans do not need dietary PUFA. A 1930s laboratory diet designed to demonstrate essential fatty acid deficiency instead cured a lifelong sufferer's headaches and high blood pressure permanently. Tissue saturation index correlates with lifespan: animals with the highest saturation index and lowest PUFA in their tissues have the longest life expectancy.
Anti-inflammatory amino acids should be in the diet. Glycine, taurine, and proline (from gelatin and certain seafoods) significantly mitigate the inflammatory damage endotoxin causes in the liver. Glycine in particular allows older animals to recover muscle protein synthesis rates back to roughly 85 to 90% of younger levels when taken with protein.
Vitamin K and vitamin E should not be taken together at the same time. They react with each other, with vitamin E converting vitamin K to a hydroquinone that is susceptible to UV damage and phototoxicity. Very high vitamin E doses (the human equivalent of over 2.5 grams daily for a month) can also produce vitamin K deficiency in peripheral tissues.
Most vitamin E products on the shelf are nearly worthless. Cheap vitamin E products are typically the racemic d/l-alpha-tocopherol acetate ester, which delivers only about 25% of the activity of real d-alpha-tocopherol. The l-isomer can also displace the active d-isomer from tissues, so taking the wrong form can leave someone effectively deficient. A good vitamin E should be a mixed-tocopherol product with d-alpha tocopherol as roughly half the content, plus the beta, gamma, delta forms and ideally tocotrienols.