伦敦大学学院领头的一项新研究发现，总是采用消极的思维模式可能会提高患阿兹海默症（老年痴呆）的风险。

Persistently¹ engaging in negative thinking patterns may raise the risk of Alzheimer's disease, finds a new UCL-led study.

 

In the study of people aged² over 55, published in Alzheimer's & Dementia, researchers found 'repetitive negative thinking' (RNT) is linked to subsequent cognitive³ decline as well as the deposition⁴ of harmful brain proteins linked to Alzheimer's.

 

Lead author Dr Natalie Marchant (UCL Psychiatry) said: "Depression and anxiety in mid-life and old age are already known to be risk factors for dementia. Here, we found that certain thinking patterns implicated⁵ in depression and anxiety could be an underlying⁶ reason why people with those disorders⁷ are more likely to develop dementia.

 

"We hope that our findings could be used to develop strategies to lower people's risk of dementia by helping⁸ them to reduce their negative thinking patterns."

 

For the Alzheimer's Society-supported study, the research team from UCL, INSERM and McGill University studied 292 people over the age of 55 who were part of the PREVENT-AD cohort study, and a further 68 people from the IMAP+ cohort.

Over a period of two years, the study participants responded to questions about how they typically think about negative experiences, focusing on RNT patterns like rumination⁹ about the past and worry about the future. The participants also completed measures of depression and anxiety symptoms.

 

Their cognitive function was assessed, measuring memory, attention, spatial¹⁰ cognition, and language. Some (113) of the participants also underwent PET brain scans, measuring deposits of tau and amyloid, two proteins which cause the most common type of dementia, Alzheimer's disease, when they build up in the brain.

 

The researchers found that people who exhibited higher RNT patterns experienced more cognitive decline over a four-year period, and declines in memory (which is among the earlier signs of Alzheimer's disease), and they were more likely to have amyloid and tau deposits in their brain.

 

Depression and anxiety were associated with subsequent cognitive decline but not with either amyloid or tau deposition, suggesting that RNT could be the main reason why depression and anxiety contribute to Alzheimer's disease risk.

 

"We propose that repetitive negative thinking may be a new risk factor for dementia as it could contribute to dementia in a unique way," said Dr Marchant.

 

The researchers suggest that RNT may contribute to Alzheimer's risk via its impact on indicators¹¹ of stress such as high blood pressure, as other studies have found that physiological¹² stress can contribute to amyloid and tau deposition.

 

Co-author Dr Gael Chételat commented: "Our thoughts can have a biological impact on our physical health, which might be positive or negative. Mental training practices such as meditation¹³ might help promoting positive- while down-regulating negative-associated mental schemes.

 

"Looking after your mental health is important, and it should be a major public health priority, as it's not only important for people's health and well-being¹⁴ in the short term, but it could also impact your eventual¹⁵ risk of dementia."

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