Hypothyroidism

Hypothyroidism is a slowing of the oxidative metabolism, a state in which biological efficiency falls drastically because the body is forced to rely on inefficient glycolytic metabolism, producing a chronic elevation of lactic acid even at rest. 3 Peat defined the condition as a systemic energy failure, noting that for a hypothyroid person, "just sitting passively... can be the same as running at high speed for a healthy person." 6 This metabolic suppression is not a simple glandular deficit but an adaptation to stress, where the body downregulates thyroid function to prevent the total destruction of tissues by adrenaline and cortisone. 2

The clinical picture of hypothyroidism extends far beyond the textbook presentations of myxedema and cretinism, manifesting in diverse and often paradoxical symptoms. 5 Peat observed that a very large group of hypothyroid people become hyperactive, anxious, and tachycardic due to a compensatory surge of adrenaline, which can be 20 to 40 times higher than normal. 2 This stress-driven compensation frequently leads to a misdiagnosis of hyperthyroidism, especially when physicians rely solely on a suppressed TSH without assessing metabolic rate, as stress hormones like cortisol artificially lower TSH. 2 Other common indicators include cold hands and feet, low blood sugar, fatigue, depression, dry skin, edema, and an inability to maintain weight despite high calorie intake due to the catabolic wasting of muscle tissue. 2

Diagnosis, in Peat's framework, relies on functional and physiological markers rather than the standard blood tests he considered deeply flawed. He argued that the reference range for TSH had been distorted since the 1940s to obscure widespread hypothyroidism, which he estimated might affect 60% to 80% of the population. 11 Instead, he prioritized a basal body temperature below the normal range of 97.8 to 98.2 degrees Fahrenheit, a slow pulse rate, and elevated cholesterol as reliable indicators, noting that cholesterol rises immediately upon thyroid removal and falls with supplementation because thyroid is required to convert cholesterol into protective steroids like pregnenolone and progesterone. 3 Roddy has extended this view, suggesting that a TSH suppressed below 1.0 in an unmedicated person can paradoxically indicate an extreme hypothyroid state rather than health. 8

The systemic consequences of low thyroid function involve a vicious cycle of tissue destruction and hormonal dysregulation. The compensatory rise in adrenaline drives the adrenal glands to produce more cortisone, but the adrenals themselves require thyroid hormone to synthesize cortisone from cholesterol, leading to a state of adrenal failure that Peat insisted was "really thyroid failure." 12 This catabolic state destroys muscle tissue to provide amino acids, which in turn signal the body to further suppress thyroid function. 12 Additionally, the slowed metabolic rate causes digestive sluggishness, allowing bacterial overgrowth in the small intestine and impairing nutrient absorption, which further deprives the thyroid gland of essential nutrients like magnesium and vitamin A. 10

Therapeutically, Peat advocated for thyroid supplementation, noting that a balanced product containing both T4 and T3 is often necessary because a stressed pituitary gland may not be adequately suppressed by T3 alone. 8 He documented that proper supplementation could rapidly lower cholesterol by 50 points a week and resolve symptoms of high tension by bringing adrenaline and cortisone under control. 4 Roddy has emphasized the value of Broda Barnes's book Hypothyroidism: The Unsuspected Illness for understanding the vast range of manifestations, noting that even subtle neurological traits like clumsiness or differences in intelligence can be linked to thyroid status. 7 Peat also noted that in cases of genuine hyperthyroidism, a simple intervention like drinking raw cabbage juice could suppress the gland, but he maintained that the vast majority of diagnosed "hyperthyroid" cases were actually hypothyroid individuals compensating with stress hormones. 1