Task: Question Answering
Input (English): 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 ?
Output (English): The diet is a fad diet .