27 Jun 2016 --- Like fashion, diet crazes come and go. NutritionInsight looks at some of the latest food trends to see which diets can aid in safe weight loss and improving health, and which are just “fads.” A “fad” diet promises quick weight loss through what is usually an unbalanced diet. Below are five popular food regimes: but are they simply in vogue for the moment, or will their popularity continue?