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The document titled “Estimated changes in free sugar consumption one year after the UK soft drinks industry levy came into force: controlled interrupted time series analysis of the National Diet and Nutrition Survey (2011–2019” presents a controlled interrupted time series analysis of the National Diet and Nutrition Survey (2011–2019). The study investigates the impact of the UK soft drinks industry levy (SDIL), introduced in April 2018, on the consumption of free sugars among adults and children. By comparing actual data with a counterfactual scenario of no SDIL implementation, the analysis reveals significant reductions in daily free sugar consumption from both the overall diet and soft drinks specifically, highlighting the SDIL’s effectiveness in reducing sugar intake.