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Mid-life Chronic Inflammation Linked to Cognitive Decline

Chronic inflammation is a low-grade inflammation that lingers for months or even years throughout the body.

Updated:February 14, 2019, 5:07 PM IST
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Mid-life Chronic Inflammation Linked to Cognitive Decline
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People who have chronic inflammation in middle-age may develop cognitive problems in the decades leading up to old age, researchers say.

Chronic inflammation is a low-grade inflammation that lingers for months or even years throughout the body. It can be caused by autoimmune disorders like rheumatoid arthritis or multiple sclerosis, physical stress or other causes.

Symptoms of the disorder include joint pain or stiffness, digestive problems and fatigue.

"Chronic inflammation is tough on the body, and can damage joints, internal organs, tissue and cells. It can also lead to heart disease, stroke and cancer," said study author Keenan A. Walker from the Johns Hopkins University in the US.

"While other studies have looked at chronic inflammation and its effects on the brain in older people, our large study investigated chronic inflammation beginning in middle age and showed that it may contribute to cognitive decline in the decades leading up to old age," said Walker.

For the study, researchers followed 12,336 people with an average age of 57 for approximately 20 years.

They took blood samples from participants in the beginning of the study, measuring four biomarkers of inflammation: fibrinogen, white blood cell count, von Willebrand factor, and factor VIII.

Three years later, the team measured C-reactive protein, another blood biomarker of inflammation.

Participants' thinking and memory skills were tested at the beginning of the study, six to nine years later, and at the end of the study.

The findings, published in the journal Neurology, showed that the group with the highest levels of inflammation biomarkers had an eight per cent steeper decline in thinking and memory skills than the group with the lowest levels of inflammation biomarkers.

In addition, the group with the highest C-reactive protein levels had a 12 per cent steeper decline in thinking and memory skills than the group with the lowest levels.

Getting regular exercise, following an anti-inflammatory heart healthy diet, and getting enough sleep are some of the ways to reduce chronic inflammation, the study suggested.

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