WHY do liquid diets work? Medifast - Optifast - HMR!

I am a person who has a tough time losing weight. Most people do anyway but I
am resistant to it. Exercise has to be excessive, food intake has to be perfect
and low calorie or I maintain. Yet medifast, a liquid diet, makes me lose
weight everytime I can stick to it.

I have eaten as little as 600 calories a day and never lost an ounce, yet that
is about what a consume with medifast and off comes the weight. Why do I go
into "starvation mode" on any other low calorie food diet but not on medifast?
Does anyone understand why this works??

It is a sad fact of the world for everyone, but especially us ladies, that we
are willing to torture our bodies to be thin. Here I am, suffering on
medifast, a diet that gives me heart palpitations and headaches, makes me weak
and feel gross but willing to do it because it WORKS. Because other diets cant
seem to get the last of the weight off me and the liquid diet always does.

I am so confused about dieting, I thought I was an expert. I have no idea what
to eat to make me thin and healthy and stay that way. The only time I have
maintained my weight and not gained was on an 800 calorie a day ALL PROTEIN low
fat and I mean ZERO carb diet. How the hell do I stay on that for life???? I am
really frustrated with my body. I dont even lose weight on that, only maintain.
If I eat ONE thing off the plan I gain up to 5 pounds. In 2 weeks I put on 17
pounds just from eating "normally" and not starving. I hate my body.

Well I am venting. Thanks for being here. Would love to hear any thoughts from
people out there who did liquid diets, and from other women with bodies like
mine...are you out there or am I alone?
Thanks
Vanessa