Low-carb diets are the latest fad. Before, it used to be the low-fat diets and the "meat and eggs are bad for you" diets.
In five years, another fad diet will take over.
The key to losing weight and keeping it off is a balanced diet in healthy quantities.
Did you hear that the newest fad diet is to eat copies of your "balanced diet" lecture? -- Just teasing you a little.