A new study has raised an interesting question about diet and brain health. Researchers from Karolinska Institutet found that older adults who carry certain genes linked to Alzheimer’s disease may not experience the expected decline in memory if they eat higher amounts of meat.
The study was published in JAMA Network Open and suggests that what we eat may affect our brain in different ways depending on our genes.
Alzheimer’s disease is the most common cause of dementia. It affects memory, thinking, and daily functioning. As people age, the risk increases, especially for those with certain genetic traits.
One of the most important genes related to Alzheimer’s risk is called APOE. This gene comes in several forms, and one version, known as APOE4, is strongly linked to a higher chance of developing the disease.
In many countries, including Sweden, a large number of people carry this gene. However, not everyone with this genetic risk develops Alzheimer’s. This has led scientists to ask an important question: can lifestyle factors, such as diet, help reduce this risk?
To explore this, researchers followed more than 2,100 adults aged 60 and older. All participants were free of dementia at the start of the study.
They were part of a long-term project known as the Swedish National Study on Aging and Care. The researchers tracked them for up to 15 years, collecting information about their eating habits and cognitive health.
The team compared people with different levels of meat consumption. They also looked at whether participants carried the APOE4 gene. The results showed a clear pattern. Among people who ate less meat, those with the APOE4 gene had more than twice the risk of developing dementia compared to those without the gene.
However, this higher risk was not seen in people who ate more meat. In fact, those with the gene who consumed higher amounts of meat showed slower memory decline and a lower risk of dementia. This suggests that diet may help reduce genetic risk in some cases.
The type of meat also mattered. People who ate less processed meat and more unprocessed meat had better outcomes. Processed meat includes foods like sausages and bacon, which are often linked to poorer health. Unprocessed meat, such as fresh cuts of beef or chicken, may have different effects on the body.
The researchers also found that people with the APOE4 gene who ate more unprocessed meat had a lower risk of death from any cause. This suggests that diet may have wider effects on overall health, not just the brain.
However, it is important to understand the limits of this study. It is observational, which means it shows a link but cannot prove cause and effect. Other factors, such as lifestyle or overall diet quality, may also play a role. More controlled studies are needed to confirm these findings.
In reviewing this study, the results are both interesting and cautious. They suggest that dietary advice may need to be more personalized in the future. Instead of giving the same advice to everyone, doctors may consider a person’s genetic background when making recommendations.
At the same time, the findings do not mean that everyone should eat more meat. A balanced diet with a variety of foods is still important. The study highlights the complexity of nutrition and how it interacts with the body.
Overall, this research opens the door to a new way of thinking about diet and brain health. It suggests that for some people, especially those with certain genetic risks, diet may offer a way to reduce the chances of developing serious diseases like Alzheimer’s.
If you care about Alzheimer’s, please read studies about Vitamin D deficiency linked to Alzheimer’s, vascular dementia, and Oral cannabis extract may help reduce Alzheimer’s symptoms.
For more information about brain health, please see recent studies about Vitamin B9 deficiency linked to higher dementia risk, and results showing flavonoid-rich foods could improve survival in Parkinson’s disease.
Source: Karolinska Institutet.
