Cisterna magna administration of FGF1 improved metabolic outcomes in db/db mice. Daily blood glucose levels (A), plasma insulin (B), and food intake (C) after a single cisterna magna injection of FGF1 (filled squares, 3 µg, n = 5) or vehicle (open squares, n = 6) in db/db mice. D: GSIS 6 days after cisterna magna administration of FGF1 or vehicle. E: c-Fos activation of third ventricle tanycytes 90 min after cisterna magna administration of FGF1 (filled bars, F, n = 3) or vehicle (open bars, V, n = 3). Arrows represent injection time course. Data are expressed as mean ± SEM. P values were determined by two-way ANOVA. *P < 0.05; **P < 0.01; ***P < 0.001; ****P < 0.0001; #P < 0.05 for overall treatment effect. d, days; m, minutes.