Weight loss drugs have "no end game" amid lack of data on long-term use, former FDA commissioner warns

Weight loss drugs have transformed how Americans lose weight, including former commissioner for the U.S. Food and Drug Administration Dr. David Kessler. But, Kessler warns there are unknowns about long-term use of the drugs and how to get people off them. 

"There is no end game," he said on "CBS Mornings Plus" Tuesday. "FDA allowed these medicines out without a long-term strategy."

Kessler faced unexpected weight gain while serving in his role co-leading Operation Warp Speed, the coronavirus vaccination program at the height of the pandemic, which had him working extensive hours a day at his computer.