Coffee

Coffee is a beverage whose primary active molecule, caffeine, Ray Peat treated as a vitamin-like nutrient or adaptogen, fundamentally protective and capable of compensating for hormonal deficiencies. 2 He argued that the popular health-culture and medical establishment have wrongly framed it as a harmful drug with no nutritional benefit, when in fact it is a rich source of magnesium and niacin, providing up to 20% of several essential nutrients in some diets. 3 Peat noted that a large monograph from around 1970 already defined caffeine's safety and its protective effects against carcinogenesis from radiation, chemical carcinogens, and even viral carcinogens. 7

The physiological effects of caffeine closely parallel those of thyroid and progesterone. 2 Caffeine increases cyclic AMP and decreases serotonin in thyroid cells, locally activating thyroid secretion, and it is known to increase the concentration of progesterone in the blood and brain. 2 This synergy explains why women spontaneously drink more coffee premenstrually as a form of self-medication, and why a progesterone supplement's effect is often stronger when taken with coffee. 2 Peat also detailed caffeine's ability to inhibit platelet aggregation and the release of serotonin, thereby reducing vascular spasms, blood pressure, and inflammation. 2 He considered coffee one of the most powerful anti-stress factors, capable of protecting the liver, quenching free radical damage, and blocking the breakdown of polyunsaturated fats (PUFA) in the skin. 9

Peat emphasized that the harmful reactions some people experience—anxiety, shakiness, and blood sugar crashes—are not inherent to coffee but result from improper coffee consuming technology. 2 Drinking black coffee on an empty stomach causes the caffeine to enter the circulation so rapidly that it accelerates the burning of sugar, which can trigger a stress reaction and a frenzy of adrenaline and cortisol in hypothyroid individuals with blood sugar problems. 2 The corrective practice is to consume coffee with a meal, using thick cream and sugar to slow absorption and provide fuel, which prevents the depletion of glycogen stores. 3 Peat recounted that people who previously could not tolerate even a sip of coffee were able to become happy drinkers within days by adopting this method. 2 He also noted that drinking coffee with meals greatly reduces the absorption of non-heme iron. 2

Peat’s own consumption patterns illustrated coffee's role in supporting a deficient metabolism. Before using thyroid supplements, he drank up to 50 cups a day to stave off migraines and maintain function, a behavior he described not as a destructive addiction but as the body recognizing coffee as part of its homeostasis. 6 After beginning thyroid supplementation, his craving spontaneously dropped to about five cups a day. 6 Empirically, he pointed out that the highest levels of coffee consumption—five cups and up—are associated with the lowest rates of Alzheimer's disease, Parkinson's disease, cancer, heart disease, kidney disease, and liver disease. 3 Even decaffeinated coffee retains significant nutritional value as a source of B vitamins and magnesium, though the caffeine itself overrides the negative effects of the "smoky junk" found in dark roasts. 3