Waist training: Helpful tool or harmful habit?

The Kardashians do it and say they are "obsessed." Jessica Alba claims it helped her get back to her pre-pregnancy body.

"Waist training" is making the rounds in Hollywood with its supporters claiming it can cut inches off your waist and lead to a slimmer figure. But does it actually work and how safe is it?

Plastic surgeon Dr. David Dreyfuss joins Good Day Chicago to dish the truth on the slimming phenomenon.