According to ScienceDaily, scientists may have pinpointed just how exactly being stressed screws up your ability to choose.

Based on a review of the literature on stress and decisions, the researchers found that stress actually makes us focus too much on the upside of our decisions. They explain that "Stress seems to help people learn from positive feedback and impairs their learning from negative feedback." The researchers also point out that men and women react differently towards stress, with men tending to take more risks, while women will prefer to play it safe.