They found that drinking coffee was associated with a lower risk due to heart disease, cancer, stroke, diabetes, and respiratory and kidney disease for African-Americans, Japanese-Americans, Latinos and whites. By the end of the study, about 60,000 people had died.
Those who drank one cup a day were 12 percent less likely to die compared to those who didn't drink coffee.
Even if we don't know whether coffee causes this increased longevity, these new findings suggest that people shouldn't feel guilty about their coffee consumption. The results showed a similar trend no matter what variety of coffee was drank - espressos, cappuccinos, lattes or even decaf.
According to Setiawan, it is safe to say the results apply to other groups as the association was seen in four different ethnicities.
"This study is the largest of its kind and includes minorities who have very different lifestyles", Setiawan said.
"I'm actually very reassured that you see similar findings in non-white populations", Setiawan said in an interview.
Drinking coffee also appeared to reduce the risk of death from specific causes, including digestive diseases, circulatory diseases and liver cancer. "Our study also offers important insights into the possible mechanisms for the beneficial health effects of coffee".
90 percent of us all drink coffee every day and approximately 2.25 billion cups of coffee are drunk every day worldwide.
"However, in European populations, where coffee consumption and preparation methods are variable, the relationship was less certain as relatively small studies had previously been conducted", study co-lead author Neil Murphy, from the Section of Nutrition and Metabolism at the International Agency for Research on Cancer, told IBTimes UK.
More than 680,000 people across the globe were studied by scientists in the two pieces of research. That study, called the Multiethnic Cohort Study, was conducted by the University of Hawaii Cancer Center and the Keck School of Medicine.
Image copyright Getty Images If true - by just how much could a cup of coffee lengthen lifespan?
Riboli notes that the Imperial College study found that drinking more coffee was associated with "lower markers of inflammation" and "better markers of liver function". "But the research on coffee has mostly shown no harm to people's health". Women with the biggest coffee habit, however, had an increased risk of death from ovarian cancer. Questionnaires on diet, lifestyle, family and personal medical history were provided to them. According to this study, those who drank coffee had a 12 percent lowered risk of death-but those who drank two to three cups a day saw an 18 percent lowered risk of death. The study started with 520,000 people from ten European countries and followed up over the course of 16 years.
Two large studies have found a link between drinking more coffee and living longer. Their habits could have changed over the years, and/or they might not have accurately quantified their coffee habit in the first place. Cardiovascular disease (36%) and cancer (31%) were the most common causes of death. The scientists analysed the results categorising people's sex, age, tobacco smoking, alcohol drinking and the level of their physical activity.