I thought I was pretty clued up on healthy eating and on why certain foods were good or bad. Then I read 'In Defence of Food' by Michael Pollan. It is astonishing to read about how utterly clueless, completely untrue, or often deliberately misleading, official nutritional advice is. And incredible how simple it is to eat healthily. Anyone who has ever dieted/low carbed/low anythinged should read this book.