This book is the reader's version of a 6-part TV special on, I believe, the Discovery Channel, each part of the volume reflecting the content of one of those 6 shows. In Jill Fullerton-Smith's words, the book (page 8) "reveals the real science of food using the latest research from leaders in the field of nutrition, alongside original and sometimes groundbreaking experiments that we carried out especially for the series."
The content of the book begins, appropriately enough, with a quick tour of the digestive system. Part I is termed "How to be healthy." Among other topics, it briefly notes the so-called "Evo" or "cave man diet." One nice feature of this book is the boxed material that pithily sums up major points. Page 26 points out the value of a "rainbow diet" (using fruits and vegetables of different colors, as laid out in a table), reducing saturated fat intake, choosing oils rich in monounsaturated fats, selecting unrefined grains, and watching salt intake. Commonly understood, of course, but still useful advice. Key food for the "evo diet": nuts, fruits and vegetables (as per the table just mentioned), and fish. Also important in diet is fiber. Page 39 summarizes top tips. Another representation from Part I is "detox" regimes, foods that help remove toxins from one's system (e.g., stay away from salt, sugar, red meat, soft drinks, etc. and make sure to eat nuts, fruits, and vegetables). Finally, broccoli as a wonder food.
Other parts to the book focus on "How to be slim," "How to feed the kids," "How to be sexy," "How to be the best," and "How to stay young and beautiful." Just a quick example of suggestions from other chapters. How to stay young and beautiful? Eat lots of fruits, berries, and vegetables to keep your brain young; moderate intake of red wine reduces the odds of heart disease; eating tomatoes (and their kin) can help keep skin "younger"; spinach actually appears to help eyesight.
The book concludes with a useful glossary of terms. The book is well written and provides lots of sensible advice. A lot of the suggestions are widely known already (e.g., the value of broccoli and other cruciferous vegetables), but the book packages such knowledge nicely and reports results of interesting mini-experiments that illustrate the points being made. Worthwhile for those interested in enhancing the quality of their diet.