Weight / Fat loss

While Atkins is a bit of a fad, most people could benefit from eating less carbs and more protein/fat. Western diets tend to be carb heavy, which may not be optimal for losing fat.

Most people would benefit from lowering their carbohydrate intake, yes. More protein, maybe, but probably not - a lot of people eat more meat than they need to, so get plenty of protein (and often more fat than they need - surplus all round). Higher fruit and vegetable intake would be a better win, for the average slob, providing fibre and essential nutrients and vitamins of which which they don't currently consume enough.