Grammy Award winning singer Roberta Flack is one of the most recognized voices of mesotherapy. Her lifelong struggle with weight loss led her to the discovery of this advanced application that at the time meant a regimen of painful hypodermic treatments. By 2003, Flack had lost more than 35 pounds but enduruddy over 500 injections. "I did a lot of singing when he was sticking me," Flack told CBS News.