How to Read Health Evidence: The One Skill Behind Every Other Claim

Summary

Almost every health argument turns on **one skill**: knowing what kind of evidence a claim rests on and how much weight it can bear — randomised trials can show *causation*, observational studies mostly show *correlation* (and are riddled with confounding), mechanism stories prove nothing on their own, and "a study showed…" is nearly meaningless until you ask *what kind, how big, funded by whom, and replicated?* This is the literacy that lets you weight every other entry in this knowledge base.