From the review article “Glucose cannot be replaced as an energy source but it can be supplemented, as during strenuous physical activity when blood lactate lev

From the review article “Glucose cannot be replaced as an energy source but it can be supplemented, as during strenuous physical activity when blood lactate levels are elevated [14] or during prolonged starvation [15] when blood levels of ketone bodies are elevated and BBB monocarboxylic acid transporter (MCT) levels are upregulated” And tbh, I would be more inclined to believe the peer reviewed article on glucose metabolism in the brain by an established neuroscientist tbh.