Health psychologists hope to improve people’s emotional well-being for two main reasons. First, improving people’s psychological state is desirable for its own sake. Second, it is well established that people with lower levels of stress, depression, and anxiety are more likely to show up for doctor’s appointments and stick to their treatment or diet plans. However, in recent years some researchers in the field of positive psychology have published results that suggest that there may also be some form of direct relation between positive emotions and better physical health, caused by internal physiological processes. In some cases these processes are explicitly hypothesized (such as more favourable gene expression or better functioning of the vagal nerve). Several of these studies received extensive coverage in the popular media. In this thesis, a number of claims of this type made in highly cited articles in the positive psychology literature are examined, by conducting detailed reanalyses of their published studies at the level of their theories, methods, and statistics. In each case there are a number of methodological and analytical problems that cast serious doubts on the claims made in these studies. I conclude that there is, at present, very little empirical support for the idea that enhanced positive emotions lead directly to improved physical health outcomes. The thesis discusses the implications of our findings for future research, as well as for the training of positive psychology graduate students.
|Qualification||Doctor of Philosophy|
|Place of Publication||[Groningen]|
|Publication status||Published - 2019|