British scientists from more than 200 studies on coffee consumption and health, published in The BMJ, a British medical journal.
According to the researchers, people who drink three to four cups of coffee a day are more likely to see the health benefits that damage with premature death rate of cardiovascular disease and lower liver disease.
Drink more coffee is also associated with a decrease in many types of cancer, including prostate cancer, endometrial cancer, skin cancer, leukemia, liver cancer, according to the findings of researchers. Type 2 diabetes rates, gallstones and dementia associated with coffee consumption were also lower.
Drinking three to four cups of coffee is the most beneficial to health, except for pregnant women and people prone to fractures.
Given that this was an analysis of existing studies, it is impossible to take into account many other factors that have affected the health of subjects. More studies are needed to determine causation and not just correlation. In other words, it may be that people healthier also drink coffee, but the findings of the analysis suggest that there are more positive than negative effects.
Although the review has shown that coffee consumption had more benefits than harm, studies have not been adjusted for important confounders such as body mass index, smoking, age, alcohol consumption, income and education levels.