​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 set-point concept,

A) ​these are the effects of damage to her hypothalamus.
B) ​she is losing too much muscle tissue.
C) ​she has gone below her set-point.
D) ​she is still above her set-point.

The set-point concept suggests that the body has a natural weight range or set-point, and when someone goes below that set-point through extreme dieting, the body will respond by increasing hunger and decreasing energy levels in order to return back to the set-point. This is likely the cause of Loraine's symptoms. A) Damage to the hypothalamus can disrupt appetite regulation, but it is not mentioned in the scenario. B) It is likely that Loraine is losing muscle tissue along with fat due to the extreme calorie restriction, but this is not the primary reason for her symptoms. D) Loraine is experiencing symptoms of being too low below her set-point, not above it.