Tea consumption is linked with Reduction in risk of Rheumato
The association between tea consumption and the risk of rheumatoid arthritis (RA), a chronic autoimmune disease primarily affecting the joints was studied. Tea is a popular beverage around the world and has properties that can affect the immune system.

Data on tea consumption for 2237 incident RA cases and 4661 controls matched on age, sex, and residential area were collected. Tea consumption was classified into no (0 cups/day), irregular (less than 1 cup/day), regular (1–2 cups/day), and high (more than 2 cups/day) consumption, and irregular consumption was used as the reference category. Researchers also performed stratified analysis on sex, anti-citrullinated autoantibody (ACPA) status, and smoking habits.

--Among the cases, 7.3% were found to be ever consumers of tea with 19.7 having a high tea consumption.

--Corresponding figures for the controls were 58.4% ever drinkers with 22.1% high tea consumers.

--High tea consumption had an inverse association to the risk of RA compared to irregular consumption, but the association lost statistical significance in the adjusted model.

--Among non-tea consumers, a protective effect was also observed compared to irregular consumers, but this association did not withstand sensitivity analysis, possibly due to bias.

--In the ACPA-positive group and among current smokers, a protective effect of tea consumption was observed among the high tea consumers.

In conclusion, high tea consumption appears to have a protective effect among smokers and for ACPA-positive RA.

Source: https://arthritis-research.biomedcentral.com/articles/10.1186/s13075-021-02583-y