A new study shows that a low social status can be bad for your health. Researchers in the USA looked at the behaviour of 45 female monkeys. The monkeys with a lower social status were unhealthier. The monkeys were split into groups. They had time to get to know each other. Researchers then took one monkey from each group and put her into another group. Researchers found that the "new girl" was unhealthier than the other monkeys.