The truth is, we can’t be on ALL the time. Taking breaks is healthy. Studies show that when employees take short breaks throughout the work day, they recharge their "mental" batteries, and, therefore, come back to their desk feeling more focused and energized and less fatigued.
Some breaks are better than others, though. Next time you take a break at work, don’t vent about a problem to a colleague or stay inside and have another cup of coffee. Those behaviors don’t actually make you feel re-energized because you’re not detaching from work.
Taking a break means fully detaching from the task at hand.
Source - Read More at: www.workitdaily.com