In the world of dieting, it's easy to get caught up in the latest trends and fads. But what if we told you that the key to a healthy and balanced diet is not to follow a single, restrictive plan, but rather to adopt a more flexible and adaptable approach? This is the message from Harvard professor Daniel Lieberman, who has dedicated his career to studying human evolution and its impact on our dietary habits. In his book, Fed Up: What Evolution Reveals about Food, Diet and Eating Well, Lieberman takes a critical look at popular diets and the science behind them, arguing that we should be more like the fox in the ancient fable, rather than the hedgehog.
Lieberman's central argument is that many popular diets are 'hedgehog diets' - that is, they are based on a single, often restrictive idea. For example, the raw food diet advocates for eating only unprocessed, uncooked foods, while the paleo diet suggests that we should only eat what our ancestors ate. While these diets may have some merit, Lieberman argues that they oversimplify the complex relationship between our bodies and food, and can be harmful to our health in the long term.
To illustrate this point, Lieberman conducted a personal experiment, trying out various diets including raw food, paleo, drinking shakes, low-carb high-protein, intermittent fasting, and the Mediterranean diet. While some of these diets had their merits, he found that they were often restrictive and lacked the flexibility needed to sustain a healthy lifestyle. For example, the raw food diet was excruciatingly difficult, as Lieberman constantly felt hungry despite eating high-quality foods. He argues that cooking our food gives us more energy and nutrients, and that our bodies are adapted to digest cooked food.
Lieberman also takes issue with the paleo diet's exclusion of legumes and grains, pointing out that there is ample evidence that our ancestors ate these foods. He argues that such elimination diets can be problematic, and that we should be more like the fox, adopting a flexible and adaptable approach to our diet. This means picking our diet based on the best high-quality evidence, and avoiding ultra-processed foods that are high in saturated fat and sugar.
One compelling piece of evidence for the Mediterranean diet's effectiveness is the PREDIMED study in Spain, which found that people following this diet had lower rates of heart disease and other illnesses. Lieberman argues that this diet is backed by good science, and that it is a more balanced and sustainable approach to eating. In contrast, he warns against 'hedgehog diets' that are based on a single, restrictive idea, and that we should be more like the fox, embracing a flexible and adaptable approach to our diet.
In conclusion, Lieberman's message is clear: we should be more like the fox when it comes to dieting. This means adopting a flexible and adaptable approach, based on the best high-quality evidence, and avoiding restrictive 'hedgehog diets' that can be harmful to our health in the long term. By doing so, we can enjoy a healthier and more balanced lifestyle, and perhaps even live a little longer.
