If you’re considering swapping the meat and cheese in your diet for veggie burgers and broccoli, you’re far from alone. Nearly 23 million Americans consume vegetarian-inclined diets, according to a 2012 study by the Vegetarian Research Group, and more than 7 million people call themselves vegetarians. One million more have taken it an extra step and gone vegan -- nixing all foods (and household goods) derived from animals.