I know there has been a lot of talk on the internet about reseting a person's metabolism, but that is not an easy thing. When a person is homeless, they have to get food where they can. Some kind person might give them a donut, some cookies or a sandwich. The fact is, even if you were only eating 700 or so calories a day, you were probably very badly malnourished.
Can you lose weight and regain your health ? YES. but... it's going to take a very long time. Do you have access to good medical care now ? When is the last time you had a physical ? The first thing I recommend to anyone who wants to lose a lot of weight is to go to their doctor and get a full physical. Find out what your blood pressure, cholesterol and blood sugar are. Those are very important. You might be diabetic. If so, that will effect what you eat.
So, let's not worry too much about resetting your metabolism. Instead, let's concentrate on making some simple changes that will slowly ease you and your body into a healthier routine.
Because you were homeless and malnourished, you really should be working with a doctor. Spark People can only do so much. Your doctor can help you do more.
For now ? one thing you might do is add INDYGIRL to your list of spark friends. at her highest weight, she weighed over 460+ pounds. that was two years ago. today, she's half that weight. If anyone understands how difficult it is to lose with physical limitiations, she does. www.sparkpeople.com/mypage.asp?id=~indygir
You're going to have to learn to take baby steps literally and figuratively. Every little bit will make a difference, but I really do encourage you to start by getting a full physical done. Don't be afraid to talk to a doctor. they are there to help.