Read the following context and choose the best option to answer the question.
Context: While the foods on this weight loss plan contain no proven fat burning qualities , the strict rules of this fad diet which induce a " forced starvation " by severely restricting . How a " unique new spin " on the old low carb diet c ncrease your rate of fat loss to the . Fat burning diet tips to help you burn more calories with low calorie fitness and health tips for blasting through weight loss obstacles quick and easy fat burning diet tips .
Question: Why has this diet failed to sustain weight loss ?
Options: 
A. The diet involves no exercise .
B. The diet consumes more calories than it burns .
C. The diet is a fad diet .
D. The diet shuts down key organs .


C