Oestrogen linked to raised dementia risk in diabetic women
Having both conditions raised the risk 14 times compared with the rate for women without diabetes.
On their own, high oestrogen levels also increased the chances of dementia, but not by as much.
Scientists measured oestrogen in the blood of 5644 post-menopausal women aged 65 or older who did not have dementia at the time.
Four years later, the women were given a further assessment and 132 were found to have dementia.
Both very low and very high levels of natural oestrogen doubled the chances of dementia compared with normal levels, the researchers said.
But the risk was amplified in 10 women who had both diabetes and high levels of oestrogen.
It was 14 times greater than it was for women with diabetes and normal hormone levels.
The findings, from the French National Institute of Health and Medical Research, appeared in the journal Neurology.
Dr Doug Brown, director of research at the