We need to avoid too much sun to stave off skin cancer but resulting reduction in Vitamin D production in our skin might be affecting our brains as well as our bodies.
New research covered here by Channel 9 news Australia has found that people with low levels of vitamin D (enough to be called deficient) were more likely to develop dementia.
We only get Vitamin D from a small number of foods - mushrooms that have had some exposure to UV light, salmon and other oily fish, butter and margarine and eggs - but many people may need supplements to get enough - especially those who avoid the sun or who spend most of their days indoors. If you are worried ask your doctor for a blood test.
Read more about Vitamin D in chapters 1, 2 and 4 of eat to cheat ageing.
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