If you're a healthy white person and you inherited two copies of a specific gene variant (T allele) from your parents, your brain's wiring in certain areas might be less organized than in people with a different version of that gene — and this seems to be true no matter how old you are.

What we've found so far is that the evidence does not support a link between having two copies of the T allele in the FADS2 rs174583 gene and differences in brain white matter structure in healthy white people. Our analysis of the available research shows that 61.0 assertions refute this idea, while none support it [1]. We looked at whether this specific genetic variation affects how brain wiring is organized in healthy individuals of white ethnicity. The data we reviewed consistently indicates no meaningful association. That means, based on what we've seen so far, people with two copies of the T allele do not appear to have less organized white matter in their brains compared to those with other versions of the gene — and this seems to hold across different ages [1]. It’s important to note that this conclusion is based on the current body of evidence we’ve analyzed. We’re not saying this gene has no role in brain health overall, only that we haven’t found support for it affecting white matter structure in this specific context. Genetics can influence brain development in many ways, but this particular variant doesn’t seem to show up as a factor in the studies we’ve reviewed. Our current analysis leans against this connection. Still, science builds over time, and future research could add new layers to what we understand. Practical takeaway: If you're a healthy white person with two copies of the T allele in FADS2 rs174583, the evidence we've reviewed so far doesn't suggest this affects your brain's white matter structure.