Ian Smith’s diet-nutrition-exercise-motivation book is a simple, easy-to-follow, well-written guide to his Clean 20 plan. The book is laid out in a logical manner, first introducing the reader to the problems with highly processed diets, and then explaining the benefits in detail of each of the 20 foods he suggests. Smith goes as far as reviewing different varieties of each vegetable you might find in your local grocer, along with a comparative analysis of their nutritional values. While some of his tips for shopping for various produce are quite helpful—such as how to tell if an avocado is ripe and when to buy it—others are less revelatory, such as staying away from chicken with a “strong, unpleasant odor.”
His diet and exercise plans are as specific as possible for those who need rigid guidance, but allow for experimentation, creativity, and substitution for those who don’t. It is clear that Smith understands a great number of people fail at diets without flexibility, and, as such, he has created one with a higher chance of success for more people.
One of the greatest strengths of the Clean 20 is its diversity. Many fad diets today insist that gluten, dairy, or processed foods must be removed completely. Instead, Smith recognizes the benefits of a balanced diet including both bread and cheese: two staples of almost every American meal. He also admits that cutting out all processed foods can be close to impossible. Allowing those following the plan to still enjoy some things they love, albeit as part of a much healthier meal, offers a much greater chance of success for those making the biggest changes.
If you’re already a generally healthy eater, there won’t be much surprising news in here (added sugar is bad, vegetables are good), but the concept of the Clean 20 in itself is a worthwhile endeavor no matter how healthy or unhealthy your current lifestyle is.