The standard businessmodel for weightloss sites is this: offer a "risk-free trial". It sounds free, but they get charged from day 1, unless they cancel. Assume

The standard businessmodel for weightloss sites is this: offer a "risk-free trial". It sounds free, but they get charged from day 1, unless they cancel. Assume the average user will pay for 3 to 4 months. Charge more than your customer acquisition cost. You may not want to go there and get creative with other options.