10th October 2022
Coffee drinking linked to longer lifespan
A new study finds that drinking two to three cups of ground, instant, or decaffeinated coffee each day is associated with a longer lifespan and lower risk of cardiovascular disease compared with avoiding coffee.
"In this large, observational study, ground, instant and decaffeinated coffee were associated with equivalent reductions in the incidence of cardiovascular disease and death from cardiovascular disease or any cause," said Professor Peter Kistler, from the Baker Heart and Diabetes Research Institute in Melbourne, Australia. "The results suggest that mild to moderate intake of ground, instant and decaffeinated coffee should be considered part of a healthy lifestyle."
There is little information on the impact of different coffee preparations on heart health and survival. This study, which appears in the European Journal of Preventive Cardiology, examined the associations between types of coffee and incident arrhythmias, cardiovascular disease and death. It used data from the UK Biobank project – one of the largest and deepest datasets of human health and disease in the world – consisting of adults aged 40 to 69. Cardiovascular disease was comprised of coronary heart disease, congestive heart failure, and ischaemic stroke.
The study included 449,563 participants free of arrhythmias or other cardiovascular disease at baseline. The median age was 58 years and 55.3% were women. Participants completed a questionnaire asking how many cups of coffee they drank each day and whether they usually drank instant, ground (such as cappuccino or filtered coffee), or decaffeinated. They were then grouped into six daily intake categories, consisting of none, less than one, one, two to three, four to five, and more than five cups per day. The usual coffee type was instant in 44.1% of participants, ground in 18.4%, and decaffeinated in 15.2%. There were 100,510 (22.4%) non-coffee drinkers who served as the comparator group.
Coffee drinkers were compared to non-drinkers for the incidence of arrhythmias, cardiovascular disease and death, after adjusting for age, sex, ethnicity, obesity, high blood pressure, diabetes, obstructive sleep apnoea, smoking status, and tea and alcohol consumption. Outcome information was obtained from medical records and death records. The median follow up was 12.5 years.
A total of 27,809 (6.2%) participants died during follow up. All types of coffee were linked with a reduction in death from any cause. The greatest risk reduction was seen with two to three cups per day, which compared to no coffee drinking was associated with a 14%, 27%, and 11% lower likelihood of death for decaffeinated, ground, and instant preparations, respectively.
Cardiovascular disease was diagnosed in 43,173 (9.6%) participants during follow up. All coffee subtypes were associated with a reduction in incident cardiovascular disease. Again, the lowest risk was observed with two to three cups a day, which compared to abstinence from coffee was associated with a 6%, 20%, and 9% reduced likelihood of cardiovascular disease for decaffeinated, ground, and instant coffee, respectively.
An arrhythmia was diagnosed in 30,100 (6.7%) participants during follow up. Ground and instant coffee, but not decaffeinated, was associated with a reduction in arrhythmias including atrial fibrillation. Compared with non-drinkers, the lowest risks were observed with four to five cups a day for ground coffee and two to three cups a day for instant coffee, with 17% and 12% reduced risks, respectively.
"Caffeine is the most well-known constituent in coffee, but the beverage contains more than 100 biologically active components," said Kistler. "It is likely that the non-caffeinated compounds were responsible for the positive relationships observed between coffee drinking, cardiovascular disease and survival. Our findings indicate that drinking modest amounts of coffee of all types should not be discouraged but can be enjoyed as a heart healthy behaviour."
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