Many of us will be soon be thinking about making New Year’s resolutions, whether it’s to do with eating more healthily or doing more exercise. However, how many of us have actually managed to stick to our resolutions even though we know they are good for us? The question is – why is it so difficult to change our health habits?
While it’s well recognised that our environment does not help in encouraging a healthy lifestyle - from food and drink marketing to electronic devices promoting inactivity - could there be other reasons why we find it hard to change behaviour?
 |
| "Piled Higher and Deeper" by Jorge Cham www.phdcomics.com |
What actually drives our behaviour?
Currently there exists many theories that try to explain why we do what we do, however, explanations are still lacking in regards to how our body and brain works together to directly drive our behaviour. When it comes to changing our habits, a key point to remember is that this involves stopping ourselves from doing things we consider pleasurable. For example, if you’re on a diet, every time you see an unhealthy snack, you have to tell yourself to STOP. Or, if you’re not a fan of exercising, why would you get off the sofa and slip on your running shoes? Making ourselves do things that don’t provide us with an instant reward can be stressful. These examples suggest that changing our habits can be stressful, that is, (the thought of) diet or exercise can become a source of stress (a stressor), and this makes our brain’s impulse control system work harder in order to adopt a new habit. Researchers have found that some of us can become stressed when seeing images of food, and are also not as good at controlling our impulses.1 Food craving, especially from seeing foods that we like, is a known stressor and the stress experienced from having to control our cravings is likely to tire out the impulse control system that can lead us to give in to temptations.
We might be able to change our habits for a short time as we become vigilant towards our goals, that is, the need to stick to our diet or exercise. However, we all have our limits and if stress from restricting our behaviour continues it will sap our ability to control our impulses, and our behaviour will return to what we are used to (or our ‘normal’). We saw another example of short-term success in behaviour change during our research. When monitoring children’s physical activity, some showed a burst of activity level at the start, but before long, it quickly dropped.2 These children were characterised by being hyper-vigilant towards stressors and they were generally more inactive than other children. We speculated that it was our monitoring of the activity that increased stress as the children felt that they had to show us they were more active which might spur on the initial activity spike, but as the children’s impulses for inactivity built up, it resulted in a considerable drop later on.
What’s next - how can we possibly take up, and keep up with, good health habits?
To influence health behaviour, it is crucial to understand the stress-impulse control mechanisms that DIRECTLY drive the behaviour. To use an analogy, if a person has a fractured arm, a direct treatment would be fixing the bone, rather than taking painkillers which would help to relieve the pain but not fix the problem. Similarly, if it is the stress from behaviour change and its influence on impulse control that directly causes us to succumb to temptations, we ought to target psychological interventions that reduce stress, or the brain’s impulse control system. Being able to manage our stress-impulse control system is particularly vital in the current environment where we are constantly exposed to temptations that lead to an unhealthy lifestyle. It is important to note that other factors, such as motivation and intentions, are also influential in changing our behaviour, however, this stress-impulse control process may more directly dictate the way we behave within split seconds and without our conscious awareness.
A possible psychological intervention is mindfulness training which can increase awareness of the stress cues, so that self-control can be executed before the brain’s impulse mechanism takes over. So next time we have a craving for an unhealthy snack or we are getting worked up about going for a run, we can potentially cope by containing and managing stress and impulses.
We believe that more research needs to be invested in the stress-impulse control mechanisms as it can potentially enhance the effectiveness of future individual health behaviour interventions and public health messages in getting us live a healthier lifestyle, and crucially, it can revolutionise the way we think about health behaviour change.
References
- Spitoni, G.F., Ottaviani, C., Petta, A.M., Zingaretti, P., Aragona, M., Sarnicola, A.,. & Antonucci, G. (2017). Obesity is associated with lack of inhibitory control and impaired heart rate variability reactivity and recovery in response to food stimuli. International Journal of Psychophysiology, 116, 77-84. https://www.sciencedirect.com/science/article/abs/pii/S0167876016307310?via%3Dihub
- Ling, F.C.M., Masters, R.S.W., & McManus, A.M. (2011). Rehearsal and pedometer reactivity in children. Journal of Clinical Psychology, 67, 261-266. https://onlinelibrary.wiley.com/doi/abs/10.1002/jclp.20745
The views expressed here are those of the authors and do not necessarily reflect those of Fuse (the Centre for Translational Research in Public Health) or the author's employer or organisation.
