Elroy is eager to lose weight after gaining 15 pounds during his freshman year of college. He decides to do a crash diet over the summer, which starts with cabbage soup and salad every day for two weeks. Elroy loses weight at first but quickly puts weight back on, even gaining an extra five pounds before returning to college. What is the most likely reason for this?
a. By choosing low fat foods, he increased ghrelin levels.
b. He ate too many vegetables, which contain a high carbohydrate content.
c. He chose a diet that was not diverse.
d. He triggered mechanisms designed to prevent starvation.