At least it's worthy of resurrection.
I too often find posts from new members who think that buying a bike and riding is some magic formula to lose weight. It's not. Watching your diet very carefully to not overeat and walking daily is probably a great place to start. When a significant weight loss is achieved then would be a good time to get a bike.
Having said that, I'm sure there are many people who have gotten a bike and lost significant amount of weight. I suspect they also were careful with their diet and incorporated some other type of exercise together with cycling.