Most workers have a lunch break preference, whether it’s eating at their desks, taking a walk, or sharing a meal with colleagues. But take note: it turns out that what you do with your lunch hour could be affecting the rest of your afternoon. People who ate with colleagues tended to be more relaxed for the rest of the day, decreasing performance on subsequent cognitive sharpness tests, but potentially boosting teamwork and social harmony. Eating alone, on the other hand, may be helpful for innovative problem solving. Here’s how to decide what habit suits your work goals best.