I have an undergrad and master's in business, and zero work experience in anything related to health. Despite that, or perhaps because of, I was accepted to UNC Chapel Hill and George Washington University for fall MPH programs. I addressed this directly in my application, and talked about how I would bring diversity to their program/student body. Even if you have no coursework in that specific field, your unique background will lend you skills that other candidates may not have, and you'll have a different perspective on issues that typical public health professionals may not see. I think the journalism experience is really, really cool, and should definitely help your chances. Best of luck!!