I also agree that crash diets that you don't intend to maintain permanently would just result in weight gain after you stop. But if it gets your weight down really quickly maybe it's a good starting point, but you do need to develop a new lifestyle that will keep your weight at that point once you reach it.
I watch my weight with diet instead of exercise, too, though. What I do is I only eat when I'm hungry (I don't restrict how much or what I eat when I do eat), this is my permanent habit and it keeps me at a good weight (IMO, of course). But I rarely snack, I don't eat fast food, I don't drink soft drinks, and I can't handle alcohol. My snacking amounts to maybe one or two small chocolates over a week. I know it's unhealthy that I don't exercise, but I do walk a lot on a daily basis.
I watch my weight with diet instead of exercise, too, though. What I do is I only eat when I'm hungry (I don't restrict how much or what I eat when I do eat), this is my permanent habit and it keeps me at a good weight (IMO, of course). But I rarely snack, I don't eat fast food, I don't drink soft drinks, and I can't handle alcohol. My snacking amounts to maybe one or two small chocolates over a week. I know it's unhealthy that I don't exercise, but I do walk a lot on a daily basis.
