These diets are not specific eating regimens created for specific persons, and their main purpose is definitely not weight loss. They are either diets that restrict certain kinds of foods because they are harmful to individuals that have a specific health issue – like the gluten-free diet – or ways of eating that promote health and are scientifically proven beneficial for wellness, better cognition and longevity. Those that deal with a health issue should be followed under the guidance of a registered dietician and the specialized physician. The ones that are recommended for good health – like the Mediterranean diet – can be implemented in every healthy person’s lifestyle.