A Systems Perspective on Obesity

Hi, my name is Jorijntje Makkenbach, an epidemiologist focused on the prevention of obesity. I'm associate professor in the Netherlands and currently co-leading the Dutch Knowledge Network on systems thinking. In the next five minutes, I'll share some important insights into systems thinking and the ways in which a systems science perspective can help us enhance obesity prevention. Let's get started. Whether you're new to the topic of obesity or have many years of experience, one thing is clear. Obesity is not caused by a single factor. It emerges from many influences acting together, including biology, behavior, and upstream environmental and social drivers. Over time, these factors interact and reinforce each other, shaping long-term patterns in population health. So what is systems thinking? Systems thinking acknowledges that outcomes such as obesity are the product of a complex system of interdependent and interacting factors. Instead of asking what causes obesity, It asks, how do multiple factors interact over time to produce and sustain obesity? A systems perspective encourages us to look at the interactions and feedback loops that maintain or reinforce obesity, rather than trying to identify a single main cause. In this sense, obesity can be seen as an emergent property of the wider system, a predictable outcome of how the system functions. Another key characteristic of complex systems is adaptation. Systems tend to maintain a certain equilibrium, and any effort to change one element often triggers a response elsewhere in the system. For instance, the implementation of a sugar-sweetened beverage tax may initially reduce consumption, but retailers may respond with more buy-one-get-one-for-free promotions to increase sales, which may then limit the effects of the policy. The system adapts, it reconfigures itself, and this often dampens the effect of single interventions. So what does this mean in practice? How does applying a systems perspective change the way we act, think and plan ahead? Well, first of all, a systems science perspective helps us understand that obesity is actually a predictable outcome of system design. and not simply the result of individual choice or bad luck. In environments that favor passive transportation, long hours sitting at work, limited time for cooking, and easy access to cheap, unhealthy foods, overconsumption and underactivity become the default. And so, when millions of people are exposed to these conditions year after year, Rising obesity rates are not a coincidence or a failure of individual choice, but a predictable outcome of how the system is designed. Second, it helps understand that single solutions are unlikely to change the system on their own. While approaches such as education or medication are certainly valuable and can be necessary parts of a broader strategy, they usually address only one component of the system, and therefore have limited impact on population-level obesity patterns. Because obesity emerges from multiple interacting factors that reinforce one another over time, effective change usually requires targeting multiple dynamics simultaneously. By addressing several reinforcing loops at once, we are more likely to shift the system in a lasting and predictable way. Importantly, a systems perspective helps us see obesity's stigma another reinforcing loop in the system, shaped by social norms, policy and media. Individuals currently living with obesity deserve effective treatment and support. As such, addressing obesity effectively means combining system-level preventive interventions with compassionate, evidence-based treatment, ensuring that we support individuals without blaming them for a system-driven problem. In conclusion, systems thinking provides a lens to view obesity not simply as the result of individual choices, but as a predictable outcome of a complex system. It helps us understand interactions between different drivers, anticipate unintended consequences, and design interventions that target multiple reinforcing dynamics simultaneously. Ultimately, shifting the system is challenging, but understanding it is the first step. A systems perspective can help us move from reacting to obesity to actively shaping the system for healthier outcomes. I'm Dr. Jorentje Makenbach. Thanks for watching this 5-minute CPD. Be sure to also check out our additional resources on this page and more learning at IESU's website. ♪