Central injection of liraglutide decreased body weight by inhibiting food intake.
Central injection of liraglutide increased plasma FGF21 levels in free-feeding mice.
Central injection of liraglutide reduced plasma FGF21 levels in food-deprived mice.
Liraglutide alters plasma FGF21 levels independently of body weight reduction.
There may be a central feedback system in the regulation of circulating FGF21.