Caution!

This happend to me also, when I was 18 (night manager @ grocery store) did what you're doing now for a year straight! Had lots of muscle - lost it all - went from 165lbs to 130lbs @ 5.9 (looked like a stick figure) & it's taken me years to regain what I lost in that one year. I agree with Brock compleatly but also would like to stress that you train in the morning or before work so you'll be forced to eat more as you'll be really hungry all day. You also wont have to worry about not wanting to work out after your shift ends if you make it your first priority of the day.