Translating scientific evidence into effective policies for health and technology requires care.

Selecting high-quality evidence is only part of the challenge. “Good evidence” must be paired with the “good governance of evidence”.

Key Insights 

Professional science organisations that have examined social media and adolescent mental health have reached different conclusions and policy recommendations despite examining similar research. Given their substantial influence on policy and public understanding, it is important to investigate their evidence synthesis practices. Our analysis of three high-profile reports on social media and adolescent mental health finds that they cited broadly similar types of research, yet showed little overlap (<1%) in their sources. We also found considerable variation in how the reports synthesize, communicate, and simplify evidence, including differences in citation accuracy, contextual detail, limitation acknowledgement, and conclusion strength. The stakes of getting these syntheses right are substantial. Poor synthesis quality risks developing policies which may be ineffective or cause unintended harm, and may contribute to the erosion of public trust in scientific institutions more broadly. When communicating the state of a complex scientific field, it is crucial to be honest about shortcomings and uncertainties, and to maximise fidelity to the underlying research. As scientists committed to rigorous, transparent, and replicable approaches to understanding complex phenomena, we have a responsibility to consistently uphold standards that justify claims to scientific authority and to identify opportunities for improving practices within our community

 World Happiness Report 2026 - Chapter 4 - Translating scientific evidence into effective policies for health and technology requires care.