Possible Clues:

• Picky eater’s vehicle containing 50% eggs
• Abstainer from meat and dairy
• One unlikely to order ham and eggs
• One shunning all animal products
• Likely Meatout supporter
• One topping a pizza with soy cheese, maybe
• Meat and dairy avoider
• One has reduced fare, say, in front
• One on a plant-based diet
• One eschewing leather, perhaps