Good article about why we have developed certasin conditions and reactions to foods. For those that are interested
You could read about paleo all day, but have you ever tried it?
On it atm my friend, must say best diet ever tried 
A great book to read if you like the sciency aspect of paleo-type diets:
“Perfect Health Diet: Four Steps to Renewed Health, Youthful Vitality, and Long Life” by Paul and Shou-Ching Jaminet. 25% of the book are references to supporting literature.
It takes food on a micro and macro nutrition level. It is not a book about weight loss, per se, but does devote a short chapter to that topic. I would say it is a must read for any nutritionist or health care professional.