I hate this excuse. Yes we cannot prove causation; it is very difficult to do but strong correlation and biological plausibility is enough to prove causation. If you live by this statement, fatty, don’t ever do see a doctor or get treated for anything because all they do is base their diagnostic and treatment decisions on correlations. But no, once something serious hits, they’ll be waddling into the ER and begging Drs for every life saving correlation they can have.