I switched over from the business world and can't say it hurt me at the schools where I got interviews. Most thought I have unique skills to bring to the table because of my background. Just be honest about when you decided to become a doctor and how that came about. However, I must say that I can't rule out that it hurt me at schools where they tossed my application in the trash pre-secondary.
Be VERY VERY careful about going into this process, especially if you have a stable, budding career in another industry....You'd better be very idealistic and interested in medicine when you start (I was) cause by the end, much of it has will be sapped. It's way way too much debt and sacrifice for often intangible gains. Do your soul searching and make sure you're into this. Best of luck.