Dear Friend,
I enjoyed reading your brief. It gives me the impression that you are serious about how you represent your brand. I am enraptured to inform you, that I recompense similar or even greater seriousness - when it comes to writing. I am a seasoned writer and have helped more than 187 clients. In doing so, I have experienced and conquered a variety of challenges.
1. As a ghostwriter, I write books, copy and articles on a variety of topics (including health related topics). The content I create is dependent on the styling guide, given to me by my employers.
2. Formatting and layout is usually in the styling guide, I apply, and forget.
3. Research methodology: Presenting a personal opinion or arguing for preconceived biases is something that I avoid. I do have opinions, but they are loosely held. Let's say that I am writing an article about "How diets have morphed since the 90s", I would first craft an outline - I know the subject because I have been powerlifting for the last 20 years, so I know that regardless of the type of diet - the end result is always a "caloric deficit". But maybe my client does not want me to share that opinion with his audience. How else would he/she sell his cutting-edge diet plan? Anyways, I like taking my information from credible sources - wikipedia and quora being NOT one of them.
4. Tone: personally - I have a relaxed tone, even honey coated at times - the aim is to educate and take initiative (call to action)
Zack