I have diabetes all over in my family, so I was NOT surprised when my doc decided to assume I had gestational diabetes right from the start of my pregnancy.
However, both my mom and her dad don't take good care of themselves, so I didn't have any good role models for what I should be eating. I knew what NOT to eat...but not what I should focus on instead.
The nurse that spoke with me (NOT a nutritionist) was way off in her diet recommendations, this book helped me eat again! I sat and read it in just a few days, it has great advice and was easy to understand. I don't generally use it as a reference, but I'm glad I read it early on.