I've never been to one but my general opinion is that if you're smart, can read a book and are aware of what is healthy and what's not, you don't need one. There are people out there who truly need one. I mean, I know people that actually believe that bacon is good for you.
The biggest problem that *most* people have losing weight is overestimating their calories. I feel that I am VERY educated about food and the right way to eat, but I have struggled before trying to lose a few pounds here and there.
I've told my little story a few times here on the DIS so, I apologize if you've read it before.
Last year, I wanted to lose 10 lbs. I was already walking but it really wasn't doing anything, so I upped my exercise, walked more, did some Pilates, did some of The Firm tapes. Nothing. I didn't really change my diet because I figured it wasn't that bad--I eat healthy foods, not a big soda drinker, etc. But the weight wouldn't budge. So I decided to "cut back" on my portions. I switched to all artificial sweeteners, etc. Again nothing happened.
Someone here turned me on to the website
www.fitday.com. Basically, it is a calorie tracker. It also tracks how many carbs/protein/fats you are eating a day and it puts it in a nice little pie chart. So if you are concerned about ratios with these 3 things, it is great for that. Anyway, I started entering my "cut back" eating plan just to see where I was going wrong. Well, I quickly figured out that on my "cut back" eating plan, I was still putting away anywhere from 2200-2500 calories per day!! So, I made some more cut backs and got my food down to 1700-1800 per day. And man the weight came off!! So if you haven't tried this, you might want to give it a shot.