i found the book "Eat Right For Your Type" very interesting. it isn't another lose-weight-quick scheme, but instead a study of our ancestor's living conditions and diets, and subsequently a history-based breakdown of the ancestral diet based on blood type.
i def recommend the book, and i also purchased the supplemental blood-type-specific book that breaks down good & bad foods.
listen, it may not be the end-all be-all of health and diet, but at least you're making an attempt to do something!
I love this invaluable book! enjoy!