Multiple Sclerosis

Multiple sclerosis is a demyelinating condition that Ray Peat framed not as a primary autoimmune attack, but as a metabolic and energetic failure of the oligodendrocytes—the steroid-forming cells responsible for myelination. 2 He argued that these cells require adequate thyroid hormone (specifically T3) to produce pregnenolone locally, and that a deficiency of thyroid or a block in the conversion of T4 to T3 leaves the myelin sheath vulnerable to degeneration. 2 Georgi Dinkov has cited direct evidence that demyelination is driven by low T3 levels and that T3 administration can restore the myelin sheath, positioning MS as a condition of clear metabolic origin. 10

Peat identified a characteristic physiological profile in people with MS: chronically elevated cortisol, hypoglycemia despite that cortisol excess, high prolactin, and a tendency toward hyponatremia and increased blood viscosity with platelet clumping. 1 He saw this pattern as a vicious circle initiated by energy deficiency. When hypoglycemia occurs, adrenaline liberates free fatty acids; if those fatty acids are unsaturated, they trigger serotonin release, and both serotonin and the unsaturated fats suppress mitochondrial respiration, worsening the energy deficit. 5 This cascade stimulates cortisol to mobilize amino acids from skeletal muscle, which are rich in tryptophan and cysteine—precursors for serotonin and excitotoxic agents that further suppress thyroid function. 2 The resulting excess serotonin promotes excessive water drinking, which can directly damage myelin enclosures through osmotic disruption. 1

Estrogen is a central aggravating factor in Peat's analysis. He documented that estrogen causes mast cells to release inflammatory mediators like histamine and serotonin, makes blood vessels leaky, and promotes platelet aggregation. 1 These mast cells are more numerous in MS brains, and the serotonin they release contributes to the inflammatory destruction. 1 Estrogen also disturbs the blood osmotically, causing water retention relative to solutes, and Peat emphasized that simple osmotic variations can damage myelin structures, suggesting this mechanism should be investigated before assuming immunological events are primary. 1 He noted that the strong epidemiological association of MS with estrogen had been perversely interpreted by mainstream medicine as evidence that estrogen is protective, a logic he compared to claiming a stove burns you because it is not hot enough. 2

Therapeutically, Peat reported that several people diagnosed with MS recovered completely when given thyroid supplementation, as their symptoms were manifestations of unrecognized hypothyroidism. 2 He also described a woman with an MS-like illness who achieved full motor and sensory recovery using progesterone, which counteracts estrogen's effects on mast cells and platelets. 2 Other stabilizing interventions he cited include maintaining high blood glucose to suppress the inflammatory cascade, ensuring adequate dietary protein to prevent the catabolic mobilization of amino acids, and using anti-inflammatory agents like aspirin. 3 He noted that serotonin antagonists such as ondansetron and ketanserin have been used therapeutically with success, and that naloxone or naltrexone can sometimes break the pathological endorphin patterns established by prolonged stress. 2 Peat also observed that some MS diagnoses were simply cases of protein deficiency, with symptoms disappearing after a protein-rich meal. 8 He cautioned that even the presence of brain plaques does not confirm an MS diagnosis, as studies found plaques in healthy medical students at the same rate. 9