Heavy internet usage during lunch hours could be putting too much pressure on companies' bandwidth.
As many as 72% of workers spend their lunch breaks online, with internet traffic peaking between the hours of 12pm and 4pm, according to communications company Star.
John Adey, chief operating officer at Star, warned that high-bandwidth intensive usage, such as staff watching videos, could force businesses to increase their bandwidth capacity.
"While there are many benefits to having a liberal policy to internet use, it seems the potential risks and costs are being ignored. Businesses should continue to give people access to the content they want to view during non-working hours but in a safe way.
"The ideal way to do this is via dedicated computers that are not connected to the corporate network," he said.
Of 1,000 workers surveyed, 63% said they used their break to check e-mail accounts, 62% did online shopping and 31% accessed social networking sites. One in three spend their lunchtime viewing online sports, and 16% of men admitted to watching TV, compared to 7% of women.