Fish oil could help prevent Alzheimer's

Eating more fish could give you a bigger brain - and greater protection against diseases such as Alzheimer’s, claim researchers.
They found people with higher levels of the omega-3 fatty acids found in fish oil may also have larger brain volumes in old age. This would be the equivalent to preserving one to two years of brain health, says a new study published in the journal Neurology.
Shrinking brain volume is a sign of Alzheimer’s disease as well as normal ageing. Britons are currently advised to eat fish at least twice a week, including one portion of oily fish.
One of the key omega-3 fatty acids is docosahexaenoic acid (DHA), which is thought to help nerve cells communicate with each other. The richest source of the nutrient is oily fish, such as herring, mackerel and sardines.

Source  - Daily Mail