-Ray Peat, From PMS to Menopause: Female Hormones in ContextBesides fasting, or chronic protein deficiency, the common causes of hypothyroidism are excessive stress or "aerobic" (i .e., anaerobic) exercise, and diets containing beans, lentils, nuts. unsaturated fats (including carotene), and undercooked broccoli, cauliflower, cabbage, or mustard greens. Many health conscious people become hypothyroid with a synergistic program of undercooked vegetables, legumes instead of animal proteins, oils instead of butter, carotene instead of vitamin A, and breathless exercise instead of a stimulating life.
(I particularly like that "breathless exercise instead of a stimulating life."
Peat to all us exercisers: "Get a life!" )