The most dominant factor influencing the BMR is the level of circulating, active thyroid hormone.

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The level of circulating, active thyroid hormone is the most dominant factor influencing the BMR. This hormone regulates the body's metabolic rate by controlling the amount of oxygen the body's cells consume and the amount of energy they produce. When thyroid hormone levels are low, the BMR decreases, and when thyroid hormone levels are high, the BMR increases.

The Most Dominant Factor Influencing the BMR Is the Level