For the variation in brain volume, diet seems to matter as much as the other risk factors.

Future research will be needed to determine what possible effects this additional variable had on subjects' body weight and brain volume.

A 2005 study examined the correlation between brain volume and intelligence.

The study's conclusion was that the brain volume a child achieves by the age of 1 year helps determine later intelligence.

Language acquisition almost always occurs in children during a period of rapid increase in brain volume.

Thus, in general there's a correlation between brain volume and intelligence.

In addition, brain volumes do not correlate strongly with other and more specific cognitive measures.

Others argue that these differences remain after controlling for brain volume.

Still, the association between fish, brain volume, and dementia remained.