Which of the Following Does Not Explain Why People on Weight-Loss

Which of the following does not explain why people on weight-loss diets often lose weight quickly at first, but then more slowly over time?

A) Water is lost quickly but other weight is harder to lose.
B) The initial weight loss is mostly fat.
C) As a diet progresses, the body produces more fat even with the same caloric intake.
D) The body lowers its metabolic rate when it loses weight.
E) Will power often weakens as the diet progresses.