2. Eating at your desk

Multi-tasking - dealing with e-mails and phone calls - while eating your lunch can distract you and may cause you to overeat and reach for that extra doughnut or sugar-laden cake even though you're not hungry, said Newsweek.

Worse, half of all people do not wash their desks before they eat, said dietitian Elisa Zied in a CBS interview.

"There's 400 times the amount of bacteria on your desk than there is on your office toilet," she says, emphasising the need to disinfect. She recommends giving the office table a good wipe down daily.

If you really have to eat at your desk, make sure that your food does not touch the surface of the table. If you are holding onto a sandwich or a curry puff, make sure to rest it on a large napkin or plate.