New research has indicated a significant link between Transport for London's (TfL) advertising restrictions on less healthy food and drink and a reduction in the purchase of such items. The study, conducted by the London School of Hygiene & Tropical Medicine, suggests that the 2019 policy has led to a notable decrease in the weekly calorie intake from unhealthy foods among Londoners.
The findings, published recently, reveal that the ban is associated with an average reduction of 1,000 calories per week from less healthy food purchases per person. This translates to approximately 385 fewer calories from unhealthy foods and 1.5 fewer unhealthy items bought per person each week. The policy, which prohibits advertisements for foods high in fat, sugar, and salt (HFSS) across the entire TfL network, was introduced in response to growing concerns about public health and obesity levels.
Crucially, the research highlighted that the policy's impact was more pronounced among households with lower incomes. These households experienced a larger reduction in their purchases of unhealthy food items, suggesting that such interventions could help address health inequalities. The study analysed data from a substantial number of households, comparing purchasing habits before and after the implementation of the advertising ban.
The context for this policy dates back to 2018 when the Mayor of London, Sadiq Khan, announced the plan, citing the capital's high rates of childhood obesity. The aim was to create a healthier environment and encourage healthier food choices by reducing exposure to advertisements for products often linked to poor diets. The TfL network, encompassing the Underground, Overground, buses, and DLR, provides a vast platform for advertising, reaching millions of commuters daily.
The implications of this research are significant for public health policy, both within London and potentially across the UK. It offers evidence that restricting the visibility of unhealthy food advertising can be an effective tool in the broader strategy to tackle obesity and improve dietary habits at a population level. While the study indicates an association, it contributes to the growing body of evidence supporting public health interventions that target the food environment.