and have you heard of diabesity? how one car dealership staff is trying to fight back, up next. >>> did you know americans suffer from diabesity? it's diabetes and obesity put together. the car dealership has the staff feeling glamorous. >> reporter: at the car showroom in bethesda, you're struck by the glitz, shiny new luxury vehicles and an atmosphere that exudes sexy. but this slim handsome sales manager wasn't like this. >> i hated having to hold my breath to tie my shoes. i mean, i just couldn't get all the way down there and continue it. it just was a progression, you know? every year, it got a little bit worse or put on a few more pounds. >> reporter: in fact, not only has greg kept the weight off for over a year, but he inspires eleven coworkers to do it too. >> i lost 29 pounds. >> 45 pounds. >> 70 pounds. >> 41 pounds. >> 70 pounds in five months. >> yay! >> reporter: all together, that's nearly 500 pounds. and the weight loss has had other benefits. >> all the diabetes medicine the doctors had me on, even