When you think about how the body is smart in self preservation and survival, it seems to be able to take from the lesser necessary areas. For instance: if you are freezing, you start on the areas furthest from the heart and work inward. If you look at the way people starve, other organs will go first. So by that, i would guess, that the brain is affected less than other areas until the end when you "go to sleep". If that is the case, maybe the brain "fat" is not affected in a diet ..until all fat is gone from every other place.
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