Kısaca
The fattiest organ in the body. Omega-3 deficiency can cause memory and learning problems.
The brain is the fattiest organ in the body. 60% of its dry weight is fat - the myelin sheath that transmits nerve signals is made of it.
Omega-3 fatty acids (especially DHA) are critical for brain health. Fish, walnuts, flaxseed are known as "brain food" for this reason.
Low-fat diets can negatively affect memory and concentration.
Source: Nature Neuroscience