I have definitely achieved that state before and I know exactly what you mean. Unfortunately, it was while I was a) not especially overweight, only thought I was, being 14 and self-consciously trying to be anorexic so I would be "less ugly and more popular", and b) swimming 7 times a week. I now associate making myself hungry with that not-especially-healthy period in my psychological development, and also with constantly feeling like I'm about to pass out. Also, when I've used that technique in the past, once I've either lost the weight I wanted to lose or given up, I tend to stop caring and just eat high-calorie foods all the time. I can definitely see how it would work in specific circumstances, though.