<prompt> The major fuel in the brain after several weeks of starvation is:GlucoseFatty acidb-HydroxybutyrateGlycerol  <response>: Ans. C. b-HydroxybutyrateRef: Harper 31e page 210In the prolonged fasting stage, 20 of brains energy is met by ketone bodies. Rest by available glucose. But after several weeks of starvation, ketone bodies provide the major metabolic fuel. 