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Hair dye and smoke "damages liver"

A new study has warned that hair dye and smoking could damage the liver.

While smoking led to a 63% increase in the risk of damaging the liver, hair dye increased it by 37%, according to researchers from Manchester and Newcastle.

The experts came to the conclusion after they assessed the risk of primary biliary cirrhosis on more than 4,600 people.

Although it is not properly defined which part of the hair dye may be responsible for the effect, earlier studies showed a link between cirrhosis and a chemical found in cosmetics called octynoic acid - which is used in hair dye and nail polish.

Meanwhile, the study also highlighted that previous bouts of urinary infection, psoriasis and shingles may also adversely affect the liver.

And the experts added that autoimmune diseases such as rheumatoid arthritis, thyroid and Coeliac disease could also raise the risk.

The latest study was published in the journal Gut.