Do you feel more productive with your cup of joe?

If you can't get by without your morning coffee, you're not alone.

A new survey finds many professionals feel more productive at work when they drink coffee. Food preparation and service workers top the list of those needing a caffeine boost. They are followed by scientists, sales reps, marketing and public relations professionals, as well as nurses.

Dunkin Donuts and CareerBuilder commissioned the survey to tie in with National Coffee Day, which is Saturday.