If this is truly going through your mind then a couple of things you NEED to do.
1. Research the effects of sugar on the body and the brain, soda might curb the urge to eat for a while but when you crash from the sugar high, you WILL be hungry.
2. Understand that depression is a chemical imbalance in the brain. It CAN be fixed by eating healthy and exercising. (not all but a lot of cases). Unless of course you actually enjoy your depressed state and don't actully want to fix it. Any good Dr who is treating your for depression will be telling you how important good diet and exercise is in treating this condition. Yes I have had depression diagnosed in the past so understand where you are at.
3. Being skinny WON'T make you happy. When you get to what you believe to be skinny then there will be some other reason for your depression.
4. Treatment of the cause is ALWAYS better than the treatment of the symptoms which is what you are trying to do.
I really hope you decide against this really dangerous pathway and do something healthy for you body and your mind.
Oh and something for you to think about... Why do the opinions of others in day to day life matter so much to you? You should be living your life you you NOT for others.
Today, I struggle with my depression. I don't really care if I am healthy, I just want to be happier. Being thinner will make me happier. . . Depression is a troll, but I must live with it.
Probably wont live to that point anyway. Besides, thin is healthy.
I would rather be healthy.
Soda removes calcium from your bones which in turn leads to osteoporoses.
What if you don't care? You just want to be thinner but you don't want to feel hungry all the time.