Steve203: These days, I give the stink eye to just about every "report" of beneficial health outcomes, from buying a particular product.

You sound like my SIL, who refuses to accept the data from studies that shows vaccines are safe and effective, and often have benefits far beyond their primary purpose, by reducing risks of other diseases, because evil BIG PHARMA studies are stink eye worthy fake news. She insists my cancer was the result of my COVID-19 vaccinations. After getting her COVID-19 vaccination, she (much, much later) 'purged' her body of the vaccine with nicotine gum. She also believes individuals shed vaccine after vaccination, even vaccinations that are not live-attenuated.

Anyway, coffee has been extensively studied. For example:

The BMJ Umbrella Review: An analysis of over 200 studies published in The BMJ found that coffee drinkers were 17% less likely to die early from any cause, 19% less likely to die of heart disease, and 18% less likely to develop cancer compared to non-drinkers.

Harvard's Nurses' Health Study & Health Professionals Follow-Up Study: These large cohort studies continuously tracking health outcomes found that drinking 2–3 cups a day was associated with up to a 21% reduced risk of heart disease. Higher consumption was also heavily correlated with a lower stroke risk.

Journal of the American College of Cardiology: This landmark study evaluated data from hundreds of thousands of adults and found that drinking 2–3 cups of coffee daily was associated with a significantly lower risk of cardiovascular disease and mortality.

Diabetologia & AHA Research: Researchers at Harvard linked habitual coffee intake to a reduced risk of type 2 diabetes, noting that the risk drops by roughly 6% for every cup consumed daily.

UK Biobank Liver Disease Study: Following over half a million adults, this research showed that coffee drinkers had a 21% lower risk of developing chronic liver disease and were significantly less likely to die from it, with benefits extending to both caffeinated and decaffeinated varieties.