Hi Dale,

Since the two of you have a strong background in nutrition and it makes sense to capitalize on your strengths so it sounds like what you want to do is put together a survey on a site of yours and drive traffic there using PPC.

What you want to get people to answer for you is "What is your #1 nutrition question you have?" In exchange for their answer offer a FREE copy of your product once it is complete.

Once you have enough people respond to your online survey at your site it's time to go to work and answer that #1 question that keeps popping up and address some of the other concerns people have. The you KNOW that you have a direction to go after and also know get that you will get sales as long as the product is marketed properly.

Once you put together a product it will be help bring attention to both you and your wife, so then of course you would help position that product in all advertising/marketing you do for your practices - the public loves health care professionals that create their own books and products.