Behavioural attitudes toward risk and time, as well as behavioural biases such as present bias, are thought to be important drivers of unhealthy lifestyle choices. This paper makes the first attempt to explore the possibility of training the mind to alter these attitudes and biases, in particular health-related behaviors, using a randomized controlled experiment. The training technique we consider is a well-known psychological technique called \mindfulness", which is believed to improve self-control and reduce stress.