There is an endless stream of dieting advice out there, telling people what to eat or what not to eat -- making it sound like there are simple magic bullet solutions to losing weight and getting healthier. (The really simple solution is to eat less and exercise more, but that's usually easier said than done for most people.) There have been diets telling people to avoid all carbs or all fats, and sometimes those diets work for people, but that's just anecdotal evidence. Maybe someday we'll have more medically sound data to support/refute these trendy diet fads.
If you'd like to read more awesome and interesting stuff, check out this unrelated (but not entirely random!) Techdirt post