1. It omits entire nutrient (ie: carbs) or food groups. The Grapefruit Diet, for example, promises quick weight loss by combining grapefruit or grapefruit juice with high amounts of protein at every meal. Salad dressing can be used in unlimited amounts and proteins can be deep fried if you wish, but grains are strictly prohibited. The Grapefruit Diet even restricts dieters from certain vegetables that are higher in starch. Virtually all health experts have come to the conclusion that a healthy diet consists of a variety of foods from all food groups, so any diet that eliminate food groups are not a good idea.
2. It contains words like "deotx" or "cleanse" in the title. Although these diets vary slightly in their function and composition, they all claim to focus on foods, or oftentimes an expensive supplement, that contain detoxifying agents that will somehow lead to weight loss. Proponents of these diets insist that our bodies are constantly exposed to toxins such as alcohol, artificial sweeteners, pesticides and smog-- and the only way to cleanse ourselves from these toxins is to follow a detox or cleanse regimen. However, our bodies already have natural detoxifying systems in place such as the liver, kidneys and gastrointestinal system that are designed to eliminate these toxins naturally. So although it may sound tempting to follow a diet that will "cleanse" you, in the end you're paying for something that your body does for free!
3. It makes some kind of sweeping, unbelievable claim. "Lose up to 5 pounds in 24 hours!" "Lose weight while you sleep!" - claims like these sound too good to be true...and they are! They rely on shock value to draw consumers in, but lack the sound science to back them up.
So are fad diets ever a good idea? Short answer - no! Knowing how to identify these fads will have you on the right path to choosing a healthy diet that's right for you.
Brianna Wilson, MS, RD is a dietitian and freelance writer based in Boston, Massachusetts. Brianna received a Bachelor of Science degree in dietetics from California State University, Fresno and a Master of Science degree in nutrition from Boston University. She currently works with an adult weight management program through Winchester Hospital. She is passionate about food and eating and enjoys teaching others about the preventative benefits of following a healthy lifestyle. Contact Brianna via email at briwilsonRD@gmail.com.