satiety
飫 centers on the state of being fully satisfied, especially after eating: satiety, having had enough, or being filled to contentment.
飫 combines 飠 (food) with 夭, which likely contributes the sound and may suggest abundance or fullness. The exact historical development is uncertain.
The food radical 飠 beside 夭, which looks like a person with arms wide, suggests a person who has eaten so much they are stretching out in satisfaction: full and content.
For ヨウ, imagine a satisfied person saying 'Yo, I'm full!' after a big meal: Yo -> ヨウ, and the food radical 飠 reinforces the eating context.