cancer fought and won now want to weight loss thing

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I'm in my 20's and fought two different cancer and bet them both now I find out why I have lose weight or gain and in have tthyroid prom bles now they have me on the med and now I'm try to lose the weigh and really need some help to keep me on track. And want to make new friend because all the cancer I found out who my true friends where. Now a new began for me here out it always going to hard to stay on this weight Los thing