ST. LOUIS – Fast food, processed food, too much salt, or too much sugar. Figuring out what to put on your plate can be very confusing. People who study food science and the way the body works can offer help about what to eat and when to say “no thank you.” Best-selling author Dr. Ian Smith visits Fox 2 News at 11 to discuss his new book, “The Clean 20: 20 Foods, 20 Days, Total Transformation.”