CHICAGO -

National Coffee Day is Saturday, September 29, and according to a new survey nearly half of American workers claim they are less productive when they don’t have their cup of Joe.

The survey was commissioned by Dunkin' Donuts and CareerBuilder.
Topping the list of workers who say they need coffee the most: food preparation and service workers followed by scientists and sales representatives.

Of the more than four thousand workers surveyed, sixty-three percent say they fit a coffee break into their “daily grind” at least twice a day. Twenty-eight percent drink three cups or more.

Coffee helps younger workers stay productive. 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.

When it comes to which gender claims a bigger caffeine boost: Forty-seven percent of female workers claim they are less productive without coffee, compared to 40 percent of male workers.