Alzheimer’s disease is one of the most feared conditions of aging. It slowly affects memory, thinking, and daily life, and there is still no cure.
Many people wonder what they can do to lower their risk. Diet is often discussed as an important factor, but the answers are not always simple. A new study from Karolinska Institutet in Sweden suggests that the effect of diet may depend on a person’s genes, especially when it comes to eating meat.
The research, published in JAMA Network Open, looked at how meat consumption relates to memory decline and dementia risk in older adults. The study focused on a specific gene called APOE, which is known to play a strong role in Alzheimer’s disease. Some versions of this gene, especially APOE 3/4 and APOE 4/4, increase a person’s risk of developing Alzheimer’s.
In Sweden, about 30 percent of people carry one of these higher-risk gene types. Among people who already have Alzheimer’s disease, nearly 70 percent have these genetic patterns. Because of this, scientists are very interested in understanding how lifestyle factors, such as diet, might interact with these genes.
To explore this question, the researchers followed more than 2,100 adults aged 60 and older. None of the participants had dementia at the start of the study.
They were part of a long-term project called the Swedish National Study on Aging and Care in Kungsholmen. The participants were tracked for up to 15 years, allowing researchers to observe changes in memory and thinking over time.
The researchers collected information about what people ate, including how much meat they consumed. They also considered other factors such as age, sex, education, and lifestyle habits, so they could better understand the relationship between diet and brain health.
The results showed a clear pattern. Among people who had the higher-risk APOE gene types, those who ate less meat had more than twice the risk of developing dementia compared to people without those genes. However, this increased risk was not seen in people with the same genes who ate more meat.
In fact, participants with APOE 3/4 or 4/4 who consumed higher amounts of meat showed slower memory decline and a lower risk of dementia. On average, the group with the highest intake ate about 870 grams of meat per week. This suggests that for some people, diet may help reduce the impact of genetic risk.
The researchers believe this finding may be linked to human evolution. The APOE4 gene is thought to be the oldest version of the gene and may have developed when early humans relied more on animal-based foods. This could mean that people with this gene may respond differently to certain diets.
The study also found that the type of meat matters. People who ate less processed meat, such as sausages and cured meats, had a lower risk of dementia. This was true for all participants, regardless of their genetic background. Unprocessed meat, such as fresh cuts of beef, pork, or poultry, appeared to be the better choice.
In addition to brain health, the researchers also looked at overall survival. They found that people with the higher-risk APOE gene who ate more unprocessed meat had a lower risk of dying from any cause during the study period. This suggests that diet may have wider health effects beyond just the brain.
However, it is important to understand the limits of this research. This was an observational study, which means it can show a connection between diet and health outcomes, but it cannot prove that one directly causes the other. Other factors that were not measured could also influence the results.
The findings are still very important because they suggest that one-size-fits-all dietary advice may not work for everyone. What is healthy for one person may not be ideal for another, especially when genetics are involved. This opens the door to more personalized nutrition, where advice is tailored to each individual’s genetic makeup.
The researchers say that more studies, especially clinical trials, are needed to confirm these results. Such studies could help doctors develop clearer guidelines for people with different genetic risks.
In conclusion, this study offers a new perspective on diet and Alzheimer’s disease. It suggests that for some people with a higher genetic risk, eating more unprocessed meat may help protect brain health and reduce the risk of dementia.
At the same time, it highlights the importance of looking at both genetics and lifestyle together when thinking about health.
If you care about Alzheimer’s disease, please read studies that bad lifestyle habits can cause Alzheimer’s disease, and strawberries can be good defence against Alzheimer’s.
For more information about brain health, please see recent studies that oral cannabis extract may help reduce Alzheimer’s symptoms, and Vitamin E may help prevent Parkinson’s disease.
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