Dr. Spencer Nadolsky is a friend of mine. Board certified obesity specialist and fitness fanatic. He recently released a book called
The Fat Loss Prescription. I like it because it's a quick read and he isn't tied to any particular approach. He starts with the least intrusive (habits), then spends some time discussing macro tracking if habits alone aren't effective. From there he discusses medicine, and finally, surgery. After all that he looks at different approaches to eating and what he thinks their strengths and weaknesses are. When he's discussing macro tracking, he goes into figuring out how many calories per day you should start with and how to fiddle from there.