“Counting calories achieves approximately the same thing as measuring oxygen consumption, and is something that will allow people to evaluate the various thyroid tests they may be given by their doctor. Although food intake and metabolic rate vary from day to day, an approximate calorie count for several days can often make it clear that a diagnosis of hyperthyroidism is mistaken. If a person is eating only about 1800 calories per day, and has a steady and normal body weight, any “hyperthyroidism” is strictly metaphysical, or as they say, “clinical.” -Ray Peat
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Cari