have eyes bigger than (one's) belly

To take more food than one is actually capable of eating. I always have eyes bigger than my belly when I go to all-you-can-eat buffets! Can't finish your meal, huh? I guess you had eyes bigger than your belly!

Common Names:

Name	Pronounced	Usage
Yekaterina	ye-kah-tye-REE-nah, ee-kah-tee-REE-nah	Russian
Shweta	-	Indian, Marathi, Hindi, Gujarati
Susumu	soo-soo-moo	Japanese
Kwesi	-	Western African, Akan
Heike	HIE-kə (Low German, Dutch)	Low German, Frisian, Dutch
Blazh	-	Medieval Slavic