How do T3 and T4 hormones affect metabolism?
T3 is approximately 3 to 5 times more biologically active than T4 and is responsible for determining body temperature and energy levels. When T3 and T4 levels are low, the body may enter a state of energy conservation, leading to weight gain and decreased energy. Conversely, high levels of these hormones can lead to hyperthyroidism, characterized by weight loss, irritability, and increased heart rate.
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