After several weeks on a 500-calorie a day diet,Loraine is constantly hungry,tired,and not interested in much of anything.According to the setpoint concept,

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The setpoint concept suggests that the body has a natural weight, or setpoint, that it strives to maintain. If Loraine is constantly hungry, tired, and not interested in much of anything, it suggests that her body is below her setpoint and her metabolism has slowed down to conserve energy. This is a common side effect of drastically reducing calorie intake and can result in fatigue, irritability, and difficulty concentrating.

After Several Weeks on a 500-Calorie a Day Diet,Loraine Is