The myelin insulation around neural axons and glial cells, which is mostly lipid, brings the fat content of an animal brain to about 60%.
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80% of brain is water. Brain is jelly like in vivo and not solid organ is seen in post mortem specimen or on TV.
Most of the human body itself is water, actually. The brain is around 60-70% water, and if you're a male between 18 and 30, the rest is usually beer.