Brown fat implantation suggested as weight loss method

Brown fat's role in heat generation, also known as thermogenesis, has been extensively studied by animal physiologists. It turns out that brown fat cells have unusual mitochondria, the tiny structures found in almost all cells that release energy from food. In the vast majority of cells this energy is either stored or used to power cellular processes. The mitochondria in brown fat, however, contain a protein called thermogenin (or uncoupling protein 1), which causes energy to dissipate as heat...

To test this approach in people, the team now plans to take white fat cells obtained through liposuction and treat them with BMP-7. The resulting brown fat cells could then be reimplanted into the original donor....

Then you start to burn energy and lose weight. Great. How do you turn it off??

From a New Scientist story [link broken] cited at BoingBoing.