“You’re vegan? How aren’t you dead?” It’s a question that Elizabeth Tighe’s 12-year-old son is asked more often than she’d like. But as a vegan raising her children to follow a plant-based lifestyle, it’s not one that particularly suprises her. In the past decade, veganism has gone from a niche subculture to a lifestyle advocated by celebrities including Beyonce and Jay-Z. In the decade following 2006, there was a 350 percent spike in people