I don't think this is being done anywhere (yet), but I could be wrong. Who really knows what goes on in those supersecret labs at the "Top 10"?
There are some reports of Parkinson's patients GAINING weight s/p DBS, thought to be due to decreased excessive movements resulting in less expenditure of calories.
Interesting thought. Would also be interesting to see if it worked in reverse (i.e., stimulating appetite in anorexics).