Of all the things humans rely on plants for - sustenance, beauty, medicine, fragrance, flavor, fiber - surely the most curious is our use of them to change consciousness: to stimulate or calm, fiddle with or completely alter, the qualities of our mental experience. Take coffee and tea: People around the world rely on caffeine to sharpen their minds. But we do not usually think of caffeine as a drug, or our daily use as an addiction, because it is legal and socially acceptable.

In the so-called Western diet, food has been replaced by nutrients, and common sense by confusion - most of what we’re consuming today is longer the product of nature but of food science. The result is what Michael Pollan calls the American Paradox: The more we worry about nutrition, the less healthy we seem to become. With In Defense of Food, Pollan proposes a new (and very old) answer to the question of what we should eat that comes down to seven simple but liberating words: "Eat food. Not too much. Mostly plants."

In Cooked, Pollan discovers the enduring power of the four classical elements - fire, water, air, and earth - to transform the stuff of nature into delicious things to eat and drink. Apprenticing himself to a succession of culinary masters, Pollan learns how to grill with fire, cook with liquid, bake bread, and ferment everything from cheese to beer. Each section of Cooked tracks Pollan’s effort to master a single classic recipe using one of the four elements.

From her place in the store, Klara, an Artificial Friend with outstanding observational qualities, watches carefully the behaviour of those who come in to browse and of those who pass in the street outside. She remains hopeful a customer will soon choose her, but when the possibility emerges that her circumstances may change for ever, Klara is warned not to invest too much in the promises of humans.

When Michael Pollan set out to research how LSD and psilocybin (the active ingredient in magic mushrooms) are being used to provide relief to people suffering from difficult-to-treat conditions such as depression, addiction, and anxiety, he did not intend to write what is undoubtedly his most personal book. But upon discovering how these remarkable substances are improving the lives not only of the mentally ill but also of healthy people coming to grips with the challenges of everyday life, he decided to explore the landscape of the mind in the first person as well as the third.