Possible Clues:

• I've strict diet for one apparently leading pack?
• One who does not eat or use animal products
• Like an eggless quiche with tempeh bacon
• Eschewing animal products
• Particular about fare for one boarding what 17 suggests we follow
• One who avoids animal products
• Like agave but not honey
• Like Gardein products
• Like some Oreos
• Like soy milk