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Now I know bread shouldn't be kept in the fridge, but I had leftover garlic bread from pizza stored in the fridge for two days.

I warmed it up and ate them (I was really lazy today haha). then I thought....I wonder if those were bad? But since it's bread I figure 2 days shouldn't be that bad.

Then I read about how you should never store bread in the fridge because it will go stale......but stale isn't the same as "spoiled" is it technically? I mean it would probably be just hard and tasteless correct?

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You're asking about a few different attributes here:

  • safe/unsafe - food is safe when it's essentially guaranteed not to cause foodborne illness. Nothing is perfect, of course, but if a food safety agency says something's safe, it means there's a sufficiently small chance of illness that they're fine with telling everyone that it's okay to eat. So if something is deemed unsafe, that doesn't mean you will get sick, it just means there's some chance.

  • stale - stale bread is dry and leathery or tough. It's not unsafe or spoiled, just much less pleasant to eat - it's about quality, not safety. Refrigeration does indeed accelerate this process.

  • spoiled - food is spoiled when it's obviously inedible. That might mean it's unsafe (e.g. moldy or rotten), or it might mean it's just not something you want to eat, like really overripe fruit. Since different people have different tastes and standards, that means spoilage can be a bit subjective.

In general, leftover cooked food is safe for 3-4 days, and garlic bread is no exception (if anything it'll be safe for longer), so you were fine. Again, "unsafe" isn't a guarantee, so longer than 3-4 days doesn't mean you will get sick.

That just leaves quality, and apparently it was good enough for you to eat, so... there you go. If it was stale it wasn't bad enough to stop you, and it certainly wasn't spoiled by your standards.

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As a biochemist, I feel that I should point out that there is a lot of misinformation about storing bread in the fridge. Bread does NOT go stale faster in the fridge provided that it is stored in a securely sealed bag (with a bag clip). Storage in a fridge alters the texture of the bread, making it slightly more chewy, and some say that storing bread in the fridge may alter the taste. Bread remains moist in the fridge if stored properly; on the other hand, bread stored at room temperature becomes dry and hard and often mouldy relatively quickly. I find that regular shop-bought sliced bread can be stored in the fridge for at least double the recommended use-by period and rarely becomes mouldy. The myth concerning fridge-stored bread becoming stale faster has arisen because the change in texture of the bread with cooling is similar to ONE of the dozens of biochemical changes that occurs in bread that is becoming stale. Furthermore, heating/toasting bread reverses even the texture change.

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