Weight Loss -Help!

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Hi I’m looking for suggestions and advice. I’ve been overweight my entire life. I feel like I’ve tried every diet there is. I have lower back issues and also joint pain issues so working out is somewhat impossible most days. We are trying to get pregnant but I really want to drop 50 lbs and I know starving myself doesn’t work. Right now I’m 330, last year my autoimmune issues and steroids pushed me to 360, once I got off the steroids the weight dropped off but now I’m stuck at my current weight. Help!