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Relational complexity of problems makes them hard to grasp as a whole

Obesity is a complex, systemic issue with no single or simple solution. Within complex systems it is normal for there to exist a complex network of causes that frequently feeds back on itself. The systems that have been modelled mathematically indicate that the overall behaviour of the system is determined by the structure of these interactions (in particular feedback loops and delays) rather than the values of any particular variables or parameters. [1]

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