Live yeast isn't a problem. In fact, Brewer's Yeast is sold as a food suppliment in healthfood stores, as it is the only non-animal source of B12. You are more likely to have a gas problem from the unfermented sugars.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk