The relationship of coffee and rosacea (skin redness) are not fully understood: it is known that caffeine reduces vasodilation and possesses immunosuppressive agents that may reduce the risk of disease. However, the warm drink can trigger the outbreak.
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A group of researchers from Qingdao University in China, headed by Dr. Lee, Sun (Suyun Li) conducted a study among 82 737 women to explore the relationship between the risk of rosacea and caffeine intake. The group of subjects was formed in 1989 and passed inspection every two years in the period from 1991 to 2005. All tests were conducted from June 2017 to June 2018. The results were published in the journal JAMA Dermatology.
Every four years the subjects were asked about the amount of consumption of caffeinated coffee, decaffeinated coffee, tea, soft drinks and chocolate. The participants answered the question, choosing from nine response options: never, one to three times a month, once a week, two to four times per week five to six times a week, once a day, two to three times a day, four to five times a day and six times a day. The total consumption of caffeine, scientists have calculated by summing the number of caffeine in each product and multiplying the frequency of consumption of the subjects.
In 2005, researchers interviewed the participants about the cases of medical diagnosis of rosacea and, if a diagnosis was made, the time interval of the outbreak (before 1991, 1991-1994, 1995-1998, 1999-2002, or 2003-2005).
Example rosacea/© Meridien Research
The study, researchers recorded 4945 of the occurrence of this disease and, after analyzing the date of diagnosis, the amount of caffeine consumed in product, and also found a significant inverse Association between risk of rosacea and the increased consumption of caffeine, particularly from coffee. Such a connection with other sources of caffeine (tea, chocolate) were identified. The study showed that the ratio of the probability of occurrence of rosacea in those who consumed four or more servings of caffeinated coffee per day, the probability of disease in those who drank the same amount of caffeine less than once a month, is 0.77.
Inverse relationship between caffeine intake and the risk of rosacea/© JAMA Dermatology
The researchers emphasize that their findings may not be a preventive strategy for preventing the progression of the disease, but will help to explore and explain the relationship of caffeine with subtypes of rosacea.