In a large prospective cohort study published today in the journal PLoS Medicine, a team of researchers from Tianjin Medical University and Yale University found that: (i) the separate and combined intake of tea and coffee were associated with lower risk of stroke, ischemic stroke, dementia, and vascular dementia; (ii) participants who reported drinking 2 to 3 cups of coffee with 2 to 3 cups of tea per day were associated with about 30% lower risk of stroke and dementia; (iii) the combination of coffee and tea seemed to correlate with lower risk of stroke and dementia compared to coffee or tea separately; and (iv) intake of coffee alone or in combination with tea was associated with lower risk of post-stroke dementia.
“Coffee and tea are among the most widely consumed beverages, both in the UK and worldwide,” said Dr. Yuan Zhang from the School of Public Health at Tianjin Medical University and colleagues.
“Coffee contains caffeine and is a rich source of antioxidants and other bioactive compounds.”
“Tea containing caffeine, catechin polyphenols, and flavonoids has been reported to play neuroprotective roles, such as antioxidative stress, anti-inflammation, inhibition of amyloid-beta aggregation, and an antiapoptotic effect.”
“Little is known about the association between the combination of coffee and tea and the risk of stroke, dementia, and post-stroke dementia,” they added.
“Therefore, we aimed to investigate the associations of coffee and tea separately and in combination with the risk of developing stroke and dementia.”
The study included 365,682 participants (50 to 74 years old) from the UK Biobank. Participants joined the study from 2006 to 2010 and were followed up until 2020.
At the outset participants self-reported their coffee and tea intake. Over the study period, 5,079 participants developed dementia and 10,053 experienced at least one stroke.
People who drank 2-3 cups of coffee or 3-5 cups of tea per day, or a combination of 4-6 cups of coffee and tea had the lowest incidence of stroke or dementia.
Individuals who drank 2-3 cups of coffee and 2-3 cups of tea daily had a 32% lower risk of stroke and a 28% lower risk of dementia compared with those who drank neither coffee nor tea.
Intake of coffee alone or in combination with tea was also associated with lower risk of post-stroke dementia.
“We found that drinking coffee and tea separately or in combination were associated with lower risk of stroke and dementia,” the scientists said.
“Moreover, drinking coffee alone or in combination with tea was associated with lower risk of poststroke dementia.”
“Our findings support an association between moderate coffee and tea consumption and risk of stroke and dementia.”
“However, whether the provision of such information can improve stroke and dementia outcomes remains to be determined.”
Y. Zhang et al. 2021. Consumption of coffee and tea and risk of developing stroke, dementia, and poststroke dementia: A cohort study in the UK Biobank. PLoS Med 18 (11): e1003830; doi: 10.1371/journal.pmed.1003830
Source link: https://www.sci.news/medicine/coffee-tea-consumption-stroke-dementia-risk-10272.html