Possible Clues:

• Diet that shuns dairy and sugar
• Zoic preceder
• Trendy diet
• ___ diet (modern fad, ironically)
• Caveman-style, as a diet
• Diet forbidding wheat and dairy
• ''Ancient'' starter
• Diet low in carbs
• Diet disallowing peanuts, pastas and pastries
• Alternative regimen to an 84-Down, informally