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17.01.2023

Decaf increases the risk of rheumatoid arthritis, regular coffee does not

Contrary to what some rheumatologists have said, drinking coffee does not increase the risk of rheumatoid arthritis. However, according to a meta-study published in Frontiers in Nutrition, there is an association between decaf and rheumatism.

Study
Epidemiologists from Tehran University of Medical Sciences in Iran traced 5 studies in the biomedical literature in which the effect of coffee and tea consumption on rheumatoid arthritis had been studied. They merged the results and analyzed them again.

Results
There was no association between tea consumption and rheumatoid arthritis, but initially there seemed to be an association between coffee consumption and rheumatism.

When the researchers distinguished between regular coffee (with caffeine) and decaf (coffee where the manufacturer had removed the caffeine from the coffee with all sorts of solvents), it turned out that all consumption of decaf increased the risk of rheumatism. This happened with a consumption of more than 2-3 cups per day.

Mechanism
"The mechanism involved seems to be the method of extracting caffeine from coffee by direct application of industrial solvents including benzene, acetone, ammonium hydroxide, sulfuric acid, ethyl acetate, methylene chloride, chloroform, ether, alcohol, trichloroethylene and carbon tetrachloride", write the Iranians. [Crit Rev Food Sci Nutr. 1999 Sep;39(5):441-56.]

"Chronic ingestion of solvent residues, even small quantities, could result in connective tissue disorders such as scleroderma, lupus, and rheumatoid arthritis." [Arthritis Res. 2000;2(1):5-15.]

Source:
Front Nutr. 2022 Feb 10;9:822557.

More:
Cup of coffee reduces RSI arm pain 20.03.2014

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