Progress in medicine is very slow and that's concerning but it's not true at all that nothing has changed over that timeframe. Medication that cures Hepatitis C has become available in that timeframe for example.
I would be really shocked to see a hormone treatment to go from initial research discovery to full human trials in just 7 years, especially for something that's not an crucial medical issue like fat burning.
It's not crucial, no, but I can't think of a single other medical issue that people would be willing to pay boatloads of money to solve. Nobody wants to lose weight the old fashioned way. You can cut a gut in thirty days, no kidding. But most people don't have thirty days of willpower. They have plenty of money they would spend on a lazy alternative, though.