On February 1, the most influential woman in America will discuss going vegan. Oprah, along with 378 of her employees, spent one week on “The Vegan Challenge,” cutting meat, dairy, and all other animal products from their diets. Tuesday’s show will include Michael Pollan, journalist Lisa Ling, who will take the audience on a tour of a slaughterhouse, and vegan author Kathy Freston, who will promote her new book, Veganist. Oprah has previously gone vegan—in 2008 she participated in a 21-day vegan cleanse as a part of Kathy Freston’s book, Quantum Wellness (a VN Veggie Award winner for the same year). Vegans across the country are organizing viewing parties for Tuesday’s show—VN will be attending the party in San Francisco.