Starving yourself

I have a girlfriend that I have known for almost seven years. I consider her a good friend and you worry about good friends.  She has been talking lately about making some life changes which is great.  One worries me though. She wants to lose weight and I guess the hard way is not for her. So a friend of hers has been following this weight loss plan that makes itself sound good. But what it boils down to is the 900 calories a day starvation diet.  I saw this lady the other night.  I had heard how I had to see her, how great she looked. I was shocked when I saw her. Yes she had lost weight. But she did not look great. She looked the way you would expect someone to look if they had been starving themselves for the past 9 mths.  Because of the calorie restrictions she can't work out so you can tell she is soft and mushy.  She doesn't look healthy and vibrant.  It scared me and now my girlfriend is determined to follow the same plan because it is fast and she doesn't want to have to wait a longer time for the results. As a friend I am scared for her and frustrated. As someone who knows what is healthy and what is not and as someone who has been around the dieting world for about 14 years now I am furious that these places can legally operate and sell women these "diets".  I am also floored that you will pay someone to starve you and lie to you about how healthy it is. In my experience people can lie and starve themselves for free.  I really don't understand the mindset of losing weight in a manner that you can't maintain for the rest of your life.  If you don't learn something you will go back to where you were.  It is inevitable.