It has been known for a long time that there is a complex relationship between thyroid disease and body weight and metabolism.
Thyroid hormone regulates metabolism in both humans and animals, and metabolism is also known as Basal BMR. It is determined by measuring Metabolic Rate.
Decrease or increase in BMR also affects the energy balance in the body, therefore, since thyroid hormones affect the metabolic rate, body weight may change accordingly.
Thyroid hormone level in hyperthyroidism. Since it is high, basal metabolism also accelerates and as a result, the person generally loses weight and body weight decreases. The factors that control appetite, metabolism, and activity are very complex, and thyroid hormone is only one factor in this complex system.
However, the more severe the hyperthyroidism, the greater the weight loss observed. Weight loss is also seen in other conditions in which thyroid hormones are elevated, such as in the toxic phase of thyroiditis, and when it becomes too high, some patients do not lose weight, but may gain weight.
In hypothyroidism, thyroid hormone levels decrease and metabolism increases. The speed also decreases accordingly. As the amount of fat accumulated in the body increases as the body spends less energy, body weight increases accordingly.
The reason for weight gain in hypothyroidism is also complex and is not always related to excessive fat accumulation. The extra weight gained by people with hypothyroidism is due to the accumulation of large amounts of salt and water.
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