On the other hand, it was observed that green tea ingestion
with a high caffeine content promoted an increase in the
satiety sensation, proved by the use of the VAS scale [22]. The
satiety signaling process is very complex, and involves several
gastrointestinal peptides and neurotransmitters. Green tea
catechins have been shown to inhibit catechol-o-methyltransferase,
an enzyme that degrades norepinephrine in the
synaptic cleft. This would lead to prolonged norepinephrine
action, has an important role in satiety signaling in the
hypothalamus, and is one possible explanation for the effect of
increased satiety with green tea