I've read both Good Calories, Bad Calories and Why We Get Fat. There is significant overlap, and it is most notable in the less technical areas, where he lays o

I've read both Good Calories, Bad Calories and Why We Get Fat. There is significant overlap, and it is most notable in the less technical areas, where he lays out the arguments against the conventional wisdom. That said (and I say this as a very technical reader), there were aspects of Good Calories, Bad Calories that went over my head because of their presentation and placement in the (very long) book. Why We Get Fat's treatment of LPL (http://en.wikipedia.org/wiki/Lipoprotein_lipase http://en.wikipedia.org/wiki/Lipoprotein_lipase) and HSL (http://en.wikipedia.org/wiki/Hormone-sensitive_lipase http://en.wikipedia.org/wiki/Hormone-sensitive_lipase), in particular, were described more clearly in the latest book, and the concepts related to them really make a difference in understanding the larger point. Probably the most important thing that I got out of Why We Get Fat is a better technical understanding for one of his core arguments (that the arrow of causation in calories in, calories out may be the reverse of what we expect). Specifically, he clearly describes the mechanism by which fat cells may pull in energy from the bloodstream, resulting in additional hunger and lethargy (ad infinitum). His new treatment of this subject, which starts with animal models of obesity, is extremely helpful and worth the price of the new book, in my opinion.