Possible Clues:

• Low-carb diet
• High-fat diet
• Fat-heavy diet
• Trendy low-carb diet
• High-fat, low-carb diet
• __ diet: high-fat, low-carb regimen
• Diet that involves eating fat, cutting carbs, and avoiding the ends of the answers to the starred clues
• Low-carb kind of diet
• Low-carb, high-fat diet
• Ultra-low-carb diet, for short