Migraine

Migraine is fundamentally a vascular and metabolic disorder driven by high estrogen and low thyroid function, with Peat tracing his own endocrinological investigations directly to his childhood experience of the condition. 2 He observed that women suffer the majority of migraines at roughly the same frequency as hypothyroidism, identifying the premenstrual crash of progesterone while estrogen remains elevated as the key window of susceptibility. 2 The immediate mechanism involves vasodilation and swelling of arteries in the brain, but Peat emphasized that the common serotonin-constricting treatments fail to address the underlying problem because serotonin simultaneously constricts veins, impairing outflow and slowing cerebral metabolism. 2 He characterized migraine as a lower-grade manifestation of the same estrogen poisoning that can culminate in epilepsy, with the vascular effects of progesterone acting to tone bulging veins and restore circulation. 3

The gut-brain axis is central to Peat's model, with the intestine serving as the source of roughly 95% of the body's serotonin. 6 He cited early research showing that both histamine and serotonin surge during an attack, and he connected this to intestinal irritation and pressure. 1 Drawing on experiments from the 1920s in which rectal pressure induced headaches in susceptible individuals, Peat argued that a combination of declining blood glucose and intestinal congestion—often from skipping meals or consuming hard-to-digest foods—triggers the migraine cascade. 2 The excess serotonin released from an inflamed gut burdens the lungs' detoxification capacity, and when blood sugar drops, the ability to clear serotonin fails, leading to venous constriction and increased blood volume in the head. 6 He noted that a daily raw carrot, by reducing intestinal stasis and endotoxin, prevented his migraines for six years, and that antibiotics given to infertile women incidentally cured their headaches. 2

Peat identified rapid, practical interventions that interrupt the process by stabilizing blood sugar and opposing estrogen. He found that eating a quart of ice cream could block a developing migraine, with one of his students requiring a gallon for the same effect, and he later discovered that a concentrated dose of progesterone dissolved in vitamin E (Progest-E) could resolve visual scotoma and pain within seconds. 2 He explained that both sugar and progesterone act as stabilizing factors that block inflammatory signals, with progesterone specifically countering the vascular and nerve-sensitizing effects of estrogen. 5 For an 86-year-old woman with persistent migraines and hallucinations, Peat recommended an eighth of a teaspoon of Progest-E, noting that her symptoms pointed to unrecognized hypothyroidism and impaired hepatic T4-to-T3 conversion. 2 He also highlighted aspirin, thyroid, and fructose as agents that work against serotonin through similar pathways, with aspirin alone capable of curing serotonin-driven vascular pathology in animal models. 9

The broader physiological context involves a coherent picture of energy failure. Peat described how low blood sugar starves cells into malfunction, causing surrounding blood vessels to dilate in a failed compensatory effort, while estrogen in excess wastes both oxygen and glucose. 8 He connected migraine to the preeclampsia spectrum, noting that the entire syndrome centers on high serotonin, and he observed that migrainoids typically exhibit unusually vivid visual imagery and high brain-stem electrical activity, with a sudden drop in serotonin triggering the painful vasodilation. 2 The ideal preventive state, he argued, is one in which cholesterol conversion to pregnenolone and onward to DHEA and progesterone is so efficient that the organism never resorts to cortisol and estrogen. 4 Long-term prevention therefore requires addressing the nutritional and thyroid deficiencies that allow progesterone to fall, including adequate calcium, vitamin D, and steady blood sugar maintained through thyroid support and dietary fiber. 2