One of my personal frustrations is the idea that one can lose weight, permanently and healthily, by dieting alone. It ain't gonna happen. Good nutrition (not a strict calorie-restricted diet) and exercise go hand in hand for a great, healthy body.
I do work with the HCG protocol, yes. And it's calorie-restricted. Except....I don't really restrict calories on it. I eat my protein servings (three a day, not two, since I work out hard), of chicken breast or steak, and then scarf down veggies like no tomorrow. And I'm full all the time. I avoid carbs when HCGing.
And it works for me!
But again - I work out and so I require extra calories. A protein bar or shake after exercise, and a larger portion of protein at meal time, an extra apple - that's not going to stall progress. Better yet, since I do work out, I get better results - sometimes up to 2 pounds a day.
Don't shortchange your body. Give it good exercise and high quality nutrition, and you'll lose weight in the long run.