Can ladybugs eat bread and is it safe for them to do so?

Yes, ladybugs can eat breadcrumbs, particularly if the Coccinellidae family members in question are herbivorous. Ladybugs tend to be carnivorous and to specialize in such insect pests as aphids and mealybugs. Some species will eat pollen and therefore take better to such indoor food source options as breadcrumbs.