Researchers claimed it can be difficult to tell the difference between cognitive decline caused by dementia or caused by a form long term liver damage cirrhosis, called hepatic encephalopathy.

“This unexpected link between dementia and liver health emphasises the importance of screening patients for potentially treatable contributors to cognitive decline,” said lead author Jasmohan Bajaj, M.D., a gastroenterologist and expert in hepatic encephalopathy with the VCU Stravitz-Sanyal Institute for Liver Disease and Metabolic Health and Richmond VA Medical Center.

The study looked at the medical records of more than 177,000 U.S. veterans diagnosed with dementia but not cirrhosis.

The case studies were predominantly male with an average age of 78 and 10.3 per cent were found as very likely to have cirrhosis.

The research stated around eight per cent of veterans who have cirrhosis also have dementia and suggested those being treated for dementia should also be tested for liver diseases.

Some liver diseases can be effectively treated, which could reverse symptoms of cognitive decline.

This was found to be the case in two older men who were thought to have dementia and Parkinson’s disease. They saw symptoms ease after being treated for hepatic encephalopathy.

One man saw such a dramatic improvement in his cognitive health that he began driving again.

The findings added this discovery could also apply to non-veterans with dementia, however further research is needed.

Bajaj added: “Early detection of liver issues allows for targeted interventions and opens avenues for addressing treatable factors contributing to cognitive decline.