The link between coffee and caffeine consumption and risk of psoriasis has been studied with varying results. The association between the two has been reported as unclear as one study touches on coffee intake as possibly improving the efficacy of methotrexate and sulfasalazine for psoriasis treatment and another suggests that high caffeine plasma levels induce an adverse effect of photochemotherapy for psoriasis.
Various studies have been conducted over the years to examine the positive and negative effects of caffeine on psoriasis. In 2005, a team led by Anahita Vali published an article on the efficacy of topical caffeine in the treatment of psoriasis, examining its effect on the level of cyclic adenosine monophosphate (cAMP) in the epidermis. Where psoriatic skin had lower levels of cAMP, the caffeine was found to inhibit the phosphodiesterase enzyme which would result in higher concentration of cAMP on psoriatic skin. After 8 weeks of application on patients it was concluded that caffeine was more effective in psoriasis treatment than the placebo. Caffeine was reported to be a safe and inexpensive treatment option.
A 2012 article published in the Archives of Dermatology evaluated the association between coffee and caffeine consumption and psoriasis risk in women in the US. They reported that there was no association between between consumption and risk for psoriasis.
Glancing at the Study Details
- 82,539 participants were included
- Participants answered questions about daily food and beverage intake during 1991, 1995, 1999 and 2003
- It was reported that participants with higher caffeine intake were more likely to be smokers and alcohol consumers
- 986 cases of psoriasis were identified
- Moderately increased risk was reported with those who had elevated coffee consumption, however this became insignificant after a smoker/non-smoker adjustment was made
- Analyses showed no significant findings with nonsmokers in relation to caffeine and psoriasis
Authors note that material change in psoriasis cases was not observed with caffeine intake after adjustments were made for various confounders, one major confounder being smoking. This prospective cohort study found results consistent with other published case-control studies on the topic which do not find significant data supporting the link between caffeine intake and psoriasis development. Future studies on this specific topic are needed to investigate further and confirm these present findings.
[image by Andrés Nieto Porras]