This is the 3643rd most frequent Japanese word.
食欲
Appetite.
"食欲が湧いてきた" indicates the emergence of appetite or feeling hungry.
食欲が湧いてきたので、夕食を作り始めました。
I started cooking dinner because I began to feel hungry.
"食欲が落ちる" refers to a decrease in appetite, likely due to external factors like heat.
夏の暑さで食欲が落ちてしまいました。
The summer heat has reduced my appetite.
"食欲をそそる" describes something that provokes or increases the desire to eat.