They often eliminate entire food groups, which means they’re unlikely to provide adequate amounts of key nutrients that are essential for our health and well-being.
- Contradict advice from qualified health professionals?
- Promote or ban specific foods or whole food groups?
- Promote a one-size-fits-all strategy?
- Promise quick, dramatic or miraculous results with minimal effort?
- Focus only on short-term results?
- Promote “miracle” pills, supplements or products touted to “burn fat”?
- Make claims based on personal testimonials or one random study?
If the answer to two or more of these questions is “yes”, it’s probably a fad.
So, how do today’s popular diets measure up? Here we road-test the blood type, Pioppi, gluten-free, and Mediterranean diets.
Finding it difficult to ‘stick to a diet’? Don’t worry, celebs like Chris Pratt are just like us.
Blood type diet
The blood type diet has been around for some time. It’s based on the idea that your blood type is a key factor in predicting your body weight, nutritional requirements, risk of chronic disease, and overall well-being.
According to this diet, those with blood type A should follow what resembles a vegetarian diet. Type Os are supposed to limit carbohydrates and increase their protein intake. Type Bs should avoid chicken, corn, wheat, lentils, tomatoes, peanuts, and sesame seeds; while type ABs should avoid caffeine, alcohol, and cured meats.
But a comprehensive review of 16 studies found there is no scientific literature to back up this list of dos and don'ts.
Verdict: Fad diet. It’s highly restrictive and may increase the risk of nutrient deficiencies.