This is according to research published in the journal Neurology, which looked at 1,650 people aged over 65. This study came from the UK, where approximately 800,000 people have dementia. This figure is expected to soar to more than one million by 2021.

Vitamin D deficiency is incredibly common among all age groups.

We make vitamin D in our skin during exposure to UVB rays from the sun; however older peoples’ skin is much less efficient at this process. Vitamin D is found in tiny amounts in some foods such as butter, egg yolks and oily fish, but far and away, the biggest source is sun exposure.

Unless you have an outdoor job, it’s quite likely your blood vitamin D level is too low. The next time you have a blood test, ask your doctor to check your vitamin D level. The optimum reading is 40 – 60 ng/mL (100 – 150 nmol/L).

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