What If Meat Could Slow Brain Aging? It Might If You Have This Gene

Beef Barrier: A growing body of research links diet to brain health, and now a new study is getting very specific about it. For people with the APOE ε4 gene — the strongest known genetic risk factor for Alzheimer’s disease — eating more meat may help protect against cognitive decline.

The Study: Researchers followed 2,157 older adults in Sweden (average age ~71) for up to 15 years, none of whom had dementia at the start. Participants completed detailed food questionnaires to estimate how much total, unprocessed, and processed meat they ate, and they underwent repeated cognitive tests over time to track changes in memory and thinking ability. The researchers also genotyped participants for the APOE ε4 Alzheimer’s risk gene, then compared rates of cognitive decline and dementia across different levels of meat consumption while adjusting for factors like age, education, lifestyle, and overall diet.

The Takeaway: Among older adults who carried the APOE ε4 gene variant linked to higher Alzheimer’s risk, those who ate more unprocessed meat experienced slower cognitive decline and a lower risk of developing dementia over the study period. For people without the gene variant, meat consumption showed no clear relationship with cognitive outcomes. However, processed meat was associated with higher dementia risk, regardless of genetic status.

Keep in Mind: Because this was an observational study based on a self-reported diet, it can only show an association — not prove that meat consumption directly protects against cognitive decline.