The role of diet in healthy brain ageing and dementia risk

July 17, 2017

Four studies being presented at the Alzheimer's Association International Conference 2017 are highlighting the potential benefits of certain diets and how they can support healthy brain ageing and help to reduce dementia risk.

There is a body of evidence indicating that what is good for the heart is also good for the head, and these new large population-based studies add to this, each looking at different versions of diets and in different groups of .

Researchers in the US used data from 5,907 healthy older people in the Health and Retirement Study to scrutinise the links between diet and and thinking skills. They were interested in the effects of the traditional Mediterranean diet (MedDiet) and a modified version called the MIND diet. Adjusting for socioeconomic, health (e.g. obesity and diabetes) and lifestyle (e.g. smoking and physical activity) factors, the team found that people who were relatively good or very good at sticking to the MedDiet or MIND diet were more likely to perform better on memory and thinking tests. The people with the highest scores onthese diets were 35-40% less likely to perform poorly on cognitive tests compared to those with lower diet scores.

A similar study in Sweden analysed data from 2,223 healthy older people (aged 60 and over) over a six-year period, looking at their dietary patterns and scoring them against an index called the Nordic Prudent Dietary Pattern (NPDP). Comparing the NPDP with a range of other healthy diets; MedDiet, MIND, DASH (Dietary Approaches to Stop Hypertension) and BSD (Baltic Sea Diet), the team looked to see whether there was any effect of diet on memory and thinking skills. They found that being relatively good or very good at sticking to the NPDP was linked with lower decline in memory and thinking skills. They found similar results for MedDiet and MIND, but no link was found between DASH or BSD diets and memory and .

In the third study being presented today, researchers looked at particular dietary components and whether they were linked with inflammatory molecules in 330 healthy older people, with an average age of 79. They found that higher levels of inflammatory molecules were associated with high intake of cholesterol, beta-carotene and lutein, and low intake of omega-3, calcium and vitamins B1, B2, B5, B6, D and E. This was also associated with reduced executive function speed – skills such as decision making, controlling behaviour and mental flexibility. No association was found between this diet pattern and memory, language and visuospatial skills.

While these three studies looked at associations between diet and memory and thinking in healthy older people, the fourth study focussed on associations with dementia risk. The researchers used data from the Women's Health Initiative Memory Study, which has followed women in the US for up to 20-years, recording information about lifestyle factors such as diet. Looking back at data from 7,057 women, the researchers analysed dietary information and calculated diet scores of how closely participants eating habits matched the MIND diet. They also looked at how many of the women went on to develop dementia over a follow-up period of almost 10 years, finding that women with diets most similar to the MIND diet had a lower risk of dementia.

Dr David Reynolds, Chief Scientific Officer at Alzheimer's Research UK, said:

"Understanding how the way we lead our lives could affect our brain health is important, as there may be lifestyle factors that are within our power to change that help support healthy ageing. This observational research highlights the role of healthy eating habits in helping to protect our brains as we get older, with many focussing on Mediterranean-style diets. A Mediterranean-style diet is one low in meat and dairy but rich in fresh fruit and vegetables, cereals, beans, nuts and 'healthy' fats like olive oil. This research builds on growing evidence suggesting that following a Mediterranean style may hold valuable health benefits as we enter our later years.

"Observational studies like these can be useful for highlighting factors linked to healthy ageing, but this type of research can't definitively answer whether specific diets can prevent dementia. Current dementia risk reduction efforts are exploring ways to support people in mid-life to adopt healthier diets, as this could be an effective way of lowering the number of people who go on to develop dementia in later life. While we know there are positive lifestyle changes that can impact dementia risk, it's important to remember that is caused by complex brain diseases influenced by age, lifestyle and genetics."

Explore further: Cognitive function up with adherence to mediterranean diet

Related Stories

Cognitive function up with adherence to mediterranean diet

July 10, 2017
(HealthDay)—For older adults, greater adherence to the Mediterranean diet (MedDiet) and the Mediterranean-DASH diet Intervention for Neurodegeneration Delay (MIND) is associated with improved cognitive function, according ...

Improving diet quality over time linked with reduced risk of premature death

July 12, 2017
People who improve the quality of their diets over time, eating more whole grains, vegetables, fruits, nuts, and fish and less red and processed meats and sugary beverages, may significantly reduce their risk of premature ...

Mediterranean diet linked to reduced brain shrinkage in old age

January 5, 2017
A new study led by researchers in Scotland has found that older people who ate a Mediterranean-type diet went on to experience less brain shrinkage than those who ate other types of food. The research is published online ...

Want a better memory? Try eating a Mediterranean diet

August 9, 2016
Eating a Mediterranean diet can slow down cognitive decline.

Mental stimulation limits the effect of Western diet on thinking skills

July 25, 2016
Researchers at the Alzheimer's Association International Conference 2016 have suggested that people with more education, a mentally challenging job and an active social life might be able to better withstand the decline in ...

To help ward off Alzheimer's, think before you eat

April 10, 2017
Diets designed to boost brain health, targeted largely at older adults, are a new, noteworthy development in the field of nutrition.

Recommended for you

Thinking 'out-of-the-box' may build a better brain and prevent dementia

September 25, 2017
More than 5 million Americans today are affected by Alzheimer's disease (AD). If nothing is done to stop this upward trajectory, there will be more than 16 million people with AD in the United States and more than 60 million ...

Multi-gene test predicts Alzheimer's better than APOE E4 alone

September 22, 2017
A new test that combines the effects of more than two dozen genetic variants, most associated by themselves with only a small risk of Alzheimer's disease, does a better job of predicting which cognitively normal older adults ...

Personality changes don't precede clinical onset of Alzheimer's, study shows

September 21, 2017
For years, scientists and physicians have been debating whether personality and behavior changes might appear prior to the onset of Alzheimer's disease and related dementias.

Newly ID'd role of major Alzheimer's gene suggests possible therapeutic target

September 20, 2017
Nearly a quarter century ago, a genetic variant known as ApoE4 was identified as a major risk factor for Alzheimer's disease—one that increases a person's chances of developing the neurodegenerative disease by up to 12 ...

Is the Alzheimer's gene the ring leader or the sidekick?

September 15, 2017
The notorious genetic marker of Alzheimer's disease and other forms of dementia, ApoE4, may not be a lone wolf.

Potential noninvasive test for Alzheimer's disease

September 6, 2017
In the largest and most conclusive study of its kind, researchers have analysed blood samples to create a novel and non-invasive way of helping to diagnose Alzheimer's disease and distinguishing between different types of ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.