Only a relatively small cohort study admitting of robust discussion but a precautionarily note to those who tend to be certain well ahead of mature evidence. Fascinating.
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CONCLUSIONS AND RELEVANCE: In this study, higher meat consumption was associated with better cognitive trajectoires and lower dementia risk among individuals with APOE34/44 genotypes.
It seems that they didn’t adjust for income, wealth or socio-economic status. But they adjusted for education. Might be enough 
But otherwise it can just be wealthier ~ eat more meat ~ healthier.