New Study Links Meat Consumption and Dementia Risk
A recent observational study suggests there may be a surprising link between increased meat consumption and a reduced risk of developing dementia. Yet, this association appears primarily among individuals with the APOE4 gene variant, which is notably tied to a higher risk of Alzheimer’s disease.
Researchers from Karolinska Institutet and Stockholm University in Sweden followed 2,157 individuals over the age of 60 for up to 15 years. They compared the participants’ self-reported eating habits with their cognitive test scores and any diagnoses of dementia.
Many previous studies have emphasized the health risks linked to processed foods, and this study supports those findings. “A lower proportion of processed meat in total meat consumption was linked to a decreased dementia risk, no matter the APOE genotype,” notes neurologist Sara Garcia-Ptacek from Karolinska Institutet.
The researchers characterize APOE4 as the “ancestral human form” of the APOE gene, leading to the hypothesis that those with this variant may process a meat-rich diet differently. But it’s worth mentioning that recent discussions have raised doubts about the amount of meat consumed by our ancestors.
Moreover, extensive research has previously associated higher meat intake, especially processed red meat, with an increased risk of dementia, prompting skepticism about these new findings until further studies are conducted.
This new research adds a layer of complexity to the conversation surrounding diet and dementia. It suggests that our individual biologies and environmental exposures play significant roles.
The study tested the idea that individuals with the APOE4 gene might experience less cognitive decline and dementia when consuming more meat. This hypothesis was supported by the data, which indicated that participants with the APOE4 gene who ate the most meat had a significantly lower dementia risk, with a slower rate of memory decline.
Processed meat made up about one-third of the total meat consumed by participants. The findings imply that, in certain situations, eating meat, even red meat, could be beneficial for brain health.
However, it remains unclear why this connection exists, indicating that the relationship between diet and dementia risk could be quite personal. Researchers believe that individuals with APOE4 may absorb certain nutrients from meat in a unique way.
For those without the APOE4 variant, meat consumption generally didn’t correlate with cognitive test outcomes or dementia risk. Still, the type of meat consumed did impact results: a higher ratio of unprocessed to total meat, particularly through the consumption of red meat or poultry, was associated with a lower risk of dementia, regardless of APOE status, compared to higher processed meat intake.
The APOE gene is responsible for encoding a protein that helps transport cholesterol and fats, which could clarify some of the connections to Alzheimer’s. Just like many aspects of nutrition and health, this link requires more investigation for complete understanding.
This study, being observational, tracked participants’ regular diets and cognitive changes over time without dictating specific dietary plans.
While the findings show an association between meat intake and dementia risk, they don’t establish a causal relationship. For now, the study hints that people with the APOE4 variant—approximately a quarter of the global population—might have various ways to mitigate their dementia risk.
Clinical trials are essential to formulate dietary recommendations that cater to different APOE genotypes, suggests researcher Jakob Norgren.
The study has been published in JAMA Network Open.
