How did they correct for people who reduced their coffee use because of failing health? I mean, have they proven once and for all that drinking coffee is good f

How did they correct for people who reduced their coffee use because of failing health? I mean, have they proven once and for all that drinking coffee is good for you, or just that healthy people drink more coffee? When you are diagnosed with hypertension, diabetes, heart disease etc, you tend to get the advice to drink less coffee. Older people start drinking less coffee as their health declines because it makes them jittery.