does our body need suger?

my aunt had a stroke last week and was put on a ventilater she also had a heart attack because a lack of oxygen , she died the day after christmas , her doctor said that the two things that the brain needs is oxygen and suger . And from what i have read , we can't have anything with suger .. I go for my consultation on Jan. 04, 2000 , seeing my aunt on ventilater has scared me a little , I have read of people having the surgery and half to go on ventilater , it is not a pleasent thing.thanks michelle

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