sour stomach

have eyes bigger than one's stomach

To take more food on one's plate than one can eat; to be greedy.

leave a sour taste in one's mouth

To give one an unpleasant feeling or memory.

sour grapes

Things that somebody pretends to despise because they cannot obtain or have them.

sour note

A negative aspect to something mostly positive.

sour tooth

A liking for foods that are sour.

wolf in one's stomach

A ravenous hunger; a large appetite.