High red cell count also linked to dementia

There is a 22% increased risk of Alzheimer's for people in the haemoglobin category

Anaemia has been linked with dementia previously but a new study shows that high, as well as low, levels of haemoglobin appear to increase risk.

Blood test

The large, population-based Dutch study is one of the few to investigate dementia risk across the spectrum of haemoglobin levels, revealing a U-shaped pattern.

“High haemoglobin may be deleterious, or re­flect deleterious circumstances,” the researchers said.

They used data on more than 12,000 people without dementia aged 55 and over, and followed them for an average of 12 years.

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