If the body's set point is something like a thermostat,the "thermometer" corresponds to the:

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Leptin is a hormone produced by fat cells that signals the brain to reduce hunger and increase metabolism. The level of leptin in the body acts as a "thermometer" to signal the hypothalamus to adjust the set point for body weight and fat storage. Therefore, the level of leptin corresponds to the body's "thermometer" in the same way a thermostat responds to changes in temperature.

If the Body's Set Point Is Something Like a Thermostat,the