Did you point him in a direction of diet? If he's come to you asking questions he's probably at a point of desperation. Heck... I was at a point of desperation when I started paleo. I waited til I started to lose my vision... I bet your co-worker would be receptive.
SW (Nov 22nd 2011): 333, 1 Year: 245lbs
Current weight as of May 5th 2013: 243.2lbs
Short Term Goal: Better sleep, happy brain, figure out direction in life.
Met Goal: Be a 2x Shirt, Fit in a standard airplane seat belt without the use of a seat belt extension
Long Term Goal: 199lbs by Labour Day Weekend, Buy whatever cloths I want to wear.
Pain is temporary, quitting is forever- Lance Armstrong #NoExcuses