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  • Title: The effects of triiodothyronine on energy expenditure, nitrogen balance and rates of weight and fat loss in obese patients during prolonged caloric restriction.
    Author: Abraham RR, Densem JW, Davies P, Davie MW, Wynn V.
    Journal: Int J Obes; 1985; 9(6):433-42. PubMed ID: 3830935.
    Abstract:
    We studied ten obese patients on prolonged caloric restriction by metabolic balance techniques two weeks before and two weeks after the start of treatment with triiodothyronine (T3) (0.36-1.01 micrograms/kg/d). The rate of weight, nitrogen and fat loss calculated from metabolic balance increased during T3 therapy and these effects were maximal in the second week of treatment. In seven patients studied continuously for four weeks on T3 therapy, the rates of weight and fat loss during the fourth week of treatment were not significantly different from pretreatment values while nitrogen loss was still significantly greater. The increase in nitrogen loss, studied after the period of adaptation to caloric restriction, implies that prolonged treatment with T3 can result in significant losses of lean tissue in addition to that resulting from caloric restriction alone. Mean weight loss increased by 92 g/d during T3 therapy. T3 significantly increased the metabolic rate as measured by two other independent measures: the resting energy expenditure (REE), measured by indirect calorimetry (fourteen patients), and the sleeping heart rate (six patients).
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