The 12 lifestyle choices and conditions which fuel dementia have been identified by the World Health Organisation (WHO) in the most definitive list ever of how to avoid mental decline in later life.

New guidelines based on analysis of decades of research found that physical inactivity, smoking, eating an unhealthy diet and drinking excessive alcohol significantly increased the threat of diseases like Alzheimer's.

Medical conditions including diabetes, high blood pressure, high cholesterol and obesity also played a role in the development of cognitive decline and full-blown dementia.

And health experts also warned of a link between hearing loss and depression

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12 dementia risk factors