What are the side effects of eating bread that did not rise in oven?

Eating bread that did not rise in the oven is unlikely to cause any serious side effects. Here's why:

* The yeast is inactive: The yeast in bread is what causes it to rise. If the bread didn't rise, it means the yeast didn't activate properly. This could be due to several reasons, such as the yeast being too old, the water being too hot or too cold, or the dough not being kneaded enough.

* No harmful toxins: The yeast in bread is not harmful to humans. Even if the bread didn't rise, the yeast itself is not a source of toxins.

* It may be less palatable: The main problem with unrisen bread is that it will be dense and chewy, rather than light and airy. It may also have a slightly sour taste.

However, it's important to note that:

* If the bread has a moldy smell or appearance, it should be discarded. Mold can produce harmful toxins that are dangerous to consume.

* If you are unsure about the safety of the bread, it's best to err on the side of caution and throw it away.

In short, eating unrisen bread is unlikely to cause any serious health problems. It's just not going to be as enjoyable to eat as bread that has risen properly.