According to some authors (Degen et al., 2001;
Tai et al., 2010), satiety and the reduction of the size of
the meals is triggered by the cholecystokinin hormone
by binding to receptors in the gut, generating a signal
that is transmitted by the vagus nerve to the brainstem,
where it is relayed to the brainstem. Cholecystokinin
is also produced directly by the brain, where it acts as
a neurohormone in reducing food intake.