More than two thirds of professionals surveyed said that their ability to perform their jobs would suffer if they had to work without drinking any coffee that day.

On order of coffee consumption, the top 10 professions that involved the most coffee drinking are:

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• 1. Journalists and media staff

• 2. Police officers

• 3. Teachers

• 4. Plumbers and trade workers

• 5. Nurses and medical staff

• 6. Company executives

• 7. Telesales

• 8. IT technical support

• 9. Retail staff

• 10. Drivers

Source: Pressat, a public relations company, survey of more than 10,000 persons. Of all the professionals, 85 percent of professionals revealed that they drink at least three cups of coffee each day