well the bread they were eating was most likely a flatbread that did not have any yeast. Someone who has a better idea of the history please come in and prove me wrong.
The Jews that predate Jesus were making bread with yeast (and probably other cultures were too). The holiday Passover is celebrated with matzah, a cracker like flat bread that doesn’t have yeast, because the Jews had to leave Egypt in a hurry and couldn’t bring yeast with them and instead subsisted on matzah.
Telling everyone the reason both your daughters are pregnant with your babies is because they got you drunk, or that girls shouldn't get too huffy if it's their own brother that raped them - also options.