[handcycle2005]

The rapid weight loss and regain is most likely because of the low carb approach.

When you eat few carbs, you burn off your body's stores of glycogen, appx 1 lb in an average person. When glycogen is stored, it binds water at a ratio of 4:1. So losing the lb. of glycogen means losing 4 lbs. of water. When you then eat carbs, your body overcompensates and stores more glycogen and water than usual.

Eat a balanced diet and watch the total calorie intake.

All the oddball diets won't teach you how to eat to keep the weight off.