She founded the Beller Nutritional Institute in Beverly Hills, where her clients include Hollywood stars, executives, and people from all walks of life. Rachel is a spokesperson for the American Cancer Society and is actively involved in community outreach. She also serves as a nutrition expert for Glamour magazine and was the nutritionist for NBC&#8217;s hit series The Biggest Loser. She appears frequently on Good Morning America, The Dr. Oz Show, CNN, and ABC World News Tonight, and is the author of the bestselling book Eat to Lose, Eat to Win.