You shouldn't eat mold on bread or from a loaf with visible spots. The mold roots can quickly spread through bread, though you can't see them. Eating moldy bread could make you sick, and inhaling spores may trigger breathing problems if you have a mold allergy.

Should I be worried if I ate moldy bread?

The short answer is no, you're probably not going to die from eating mold; you'll digest it like any other food, and as long as you've got a relatively healthy immune system, the most you'll experience is some nausea or vomiting due to the taste/idea of what you've just eaten.

Can you get food poisoning from moldy bread?

Eating moldy bread may lead to food poisoning. Food that develops visible mold needs to thrown away to avoid food-borne illness. If you eat moldy bread, you may develop food poisoning and a headache. Food poisoning will make you feel sick to your stomach, causing diarrhea, vomiting and nausea.