Fad Diets Often Produce Weight Loss, at Least Initially, Because

Fad diets often produce weight loss, at least initially, because they

A) dictate the correct distribution of energy among the macronutrients.
B) prevent rapid spikes and declines in one's blood glucose level.
C) don't require people to count kcal, and are thus easier to stick to.
D) are designed to limit energy intake to around 1200 kcal/day.
E) are so enthusiastically followed by individuals on them.