Which hormone would promote the use of fats and excess amino acids for energy?

The hormone that promotes the use of fats and excess amino acids for energy is cortisol. Cortisol is a glucocorticoid hormone produced by the adrenal glands in response to stress and low blood glucose levels. It plays a critical role in the metabolism of proteins, fats, and carbohydrates.

During periods of stress or fasting, cortisol helps maintain energy availability by stimulating gluconeogenesis, the process of converting amino acids and glycerol into glucose. Additionally, it promotes lipolysis, which is the breakdown of fat stores into fatty acids that can be used as an energy source. By doing so, cortisol ensures that the body has adequate fuel to meet its energy demands when simple carbohydrates are not readily available.

This mechanism is particularly important in situations where the body needs to mobilize stored energy quickly, such as during intense physical activity or prolonged fasting. In summary, cortisol effectively facilitates the utilization of fats and amino acids for energy, making it the correct hormone in the given context.