Real vs. Fake Weight loss:

Focus on fat loss instead of weight loss. True weight loss is measured in terms of body composition. The exception is with people who are over 35% body fat and considered morbidly obese, which is being 100 pounds over what is considered ideal bodyweight for your height and frame. Those who are between 10 and 30 pounds heavy should focus on losing fat to achieve permanent weight loss.

Have your body composition measured and re-checked every 6 to 8 weeks. This is to determine if you are keeping a favorable fat to muscle ratio. Your eyes will probably tell you even before the body fat caliper will. If you are losing weight and your body shape is changing you are more than likely losing body fat. If you have lost a significant amount of weight i.e. 5 to 10% of your body weight and your shape has changed very little I would definitely look at your weight loss program a bit closer.