Interesting. What do the serious nutrition folk recommend? (Also if there's anything specific for skinny low-appetite folk...)
This article will give you a good primer on nutrition with a focus on gaining weight:
http://www.barbellmedicine.com/potpourri/584/
If you have any other specific question I'd be happy to chat through them but HN is probably not the best venue. My contact info is in my profile, I love talking about this stuff so feel free to reach out.