How is a fad diet different than a low calorie diet?

Fad diet vs low cal: This is what they call an "age old" question: Which diet works best? There are LOTS of diets out there, most of which actually work to induce weight loss. The real issue is KEEPING THE WEIGHT OFF. I recommend people find a diet they can actually stay on for LIFE. Lower calories, increasing exercise, avoiding processed foods, and drinking at least 64 oz of water. That's a diet for life!