o pozitivnych vs negativnych ucinkoch sa vedu debaty uz hodne dlho, takze ktovie..wiki:
Extensive scientific research has been conducted to examine the relationship between coffee consumption and an array of medical conditions. The general consensus in the medical community is that moderate regular coffee drinking in healthy individuals is either essentially benign or mildly beneficial. In 2012, the National Institutes of Health–AARP Diet and Health Study analysed the relationship between coffee drinking and mortality. They found that the amount of coffee consumed correlated negatively with risk of death, and that those who drank any coffee lived longer than those who did not.[119] However the authors noted, "whether this was a causal or associational finding cannot be determined from our data." A similar study with similar results was published in the New England Journal of Medicine in 2012.[119] Researchers involved in an ongoing 22-year study by the Harvard School of Public Health stated that "the overall balance of risks and benefits [of coffee consumption] are on the side of benefits."[120]

Ja si z toho laicky odvodzujem, ze kvalitna kava pita s mierou ma skor pozitivne ucinky. Btw, neviem preco v tom charte spelluju ako "expresso".