I guess i am looking probably for an introductary book on the sceince part.
Science part of what though?
There's a science for everything. Crap, you can find stuff on the science of fat cell metabolism.
How about this... are you looking for more of an intro to nutrition or training?
I saw you talking to Darth Pooh about one of Lyle's diets but i dont think i need a book on a specific diet. (maybe i do but i dont know)
The nice thing about Lyle's books, due to his anal retentive personality, is he is extremely descriptive and is actually a good teacher. So while he's 'pitching' a particular dieting strategy with each of his books (and there are many, many strategies for various people in various situations), he always takes the time to teach you a thing or two.
I think i am looking for a book that tells me about weighloss, metobolism, macros, calories, body reaction and that sort of stuff.
Sorry, I'm responding as I'm reading (bad habit of mine!).
I once saw some posts about acid vs alkaline and how it relates to weightloss. It all stemed from a debate about how coffee can hinder weight loss. That is the stuff i would like to read about. Hopefully this makes sense.
It's such a complex field that no one book is going to give you the broad understanding of how the body reacts to various things. That said, a undergrad level nutrition book as well as something like Lyle's "A Guide to Flexible Dieting" would probably do you some good. The nutrition book would be foundational and Lyle's book would be extrapolative.
A good nutrition text is Advanced Nutrition and Human Metabolism by Gropper, Smith and Groff.
But it won't be an easy read without a background in this stuff.
FYI, I learned all that I know by being persistent and refusing to let my ignorance frustrate me. Instead it propelled me forward eagerly. Whenever I come across stuff I don't understand, I stop reading and research that particular topic. I won't move on until I have a full understanding and of not only the topic but context.
Another FYI is I learn something new pretty much daily and I read/research a ton. This field is more immense than you could ever imagine.