DETROIT (WWJ) – As Michiganders celebrate National Coffee Day on Saturday, a new survey takes a look at the latest coffee consumption trends brewing in the U.S. workplace.

The survey, commissioned jointly by Dunkin’ Donuts and CareerBuilder, found that food preparation and service workers are the professions that need coffee the most.

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According to the results, the professions with the highest proportions of workers stating they are less productive without coffee vary widely. Those who need coffee to get through the workday the most are:

  1. Food Preparation/Service Workers
  2. Scientists
  3. Sales Representatives
  4. Marketing/Public Relations Professionals
  5. Nurses (Nurse, Nurse Practitioner or Physician Assistant)
  6. Editors/Writers/Media Workers
  7. Business Executives
  8. Teachers/Instructors (K-12)
  9. Engineering Technicians/Support
  10. IT Managers/Network Administrators

The survey results show that coffee plays a major role in helping professionals perk up at work, as 43 percent of those who drink coffee claim they are less productive without a cup of Joe.

The survey also shows other ways that coffee fits into people’s “daily grind” in the workplace. For example: 63 percent of workers who drink coffee actually drink two cups or more each workday, while 28 percent drink three cups or more.

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According to the survery, the majority of younger workers need coffee for energy and motivation, as 62 percent of workers aged 18 to 24 say they are less productive without coffee, with 58 percent of workers aged 25 to 34 making the same claim.

Workers in the Northeast are cup champions, with 55 percent of workers claiming to drink at least one cup of coffee each workday. Geographically, 64 percent of workers in the Northeast drink at least one cup per day, compared to the South at 54 percent and the Midwest and West at 51 percent.

Overall, 43 percent of workers who drink coffee claim they are less productive without their cup of Joe. Forty-seven percent of female workers claim they are less productive without coffee, compared to 40 percent of male workers.

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This survey was conducted online within the U.S. by Harris Interactive on behalf of CareerBuilder among 4,152 U.S. workers ages 18 and over between August 13 and September 6, 2012.