Body systemsQuestion 1672 of 1700
What is the brain's main fuel?
- Protein, which feeds brain cells all day
- Salt from the diet
- Calcium from the bones
- Glucose
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Correct answer: Glucose
High or low glucose can suddenly change thinking.
Source: Nursing Assistant (Reuter), 11.8: Neurological System
Questions last reviewed: 18 October 2026