Do they take into account diet? I don't know anything about hippocampal atrophy, but I know https://en.wikipedia.org/wiki/Korsakoff%27s_syndrome https://en.wiki

Do they take into account diet? I don't know anything about hippocampal atrophy, but I know https://en.wikipedia.org/wiki/Korsakoff%27s_syndrome https://en.wikipedia.org/wiki/Korsakoff%27s_syndrome which is a form of severe memory loss is usually seen in very heavy drinkers, but isn't caused by the drinking, but rather thiamine deficiency (alcoholics tend do have poor diets). I'm wondering if moderate drinkers may have slightly worse diets and so you see the same effect on a much smaller scale. There's also other factors like sleep and daily stress that may also play a role. I'm sure the scientists who performed this 30-year study knew about all this, are there things they did (or could have done) in this study to isolate the effects due to alcohol?