Why does this fad have staying power? Is it because the touted benefits are real? Or is that greasy, low-carb burger fried in snake oil? 

The lowest risk of death was in those people who consume three to four servings (or a total of 375 to 500 grams) of fruits, vegetables, and legumes a day

Although they represent one of the four fundamental building blocks of life, (along with proteins, lipids, and nucleic acids), carbohydrates have received much less scrutiny from researchers, until now