1) Food lasts for roughly a week at most, in or out of a refrigerator. (Typically shorter if left out.)
2) Replicator goo would be a slow transition similar to mold as the food item goes bad over time. By the time it is fully inedible, it becomes a grey-ish paste and loses consistency. You can still eat it, but it's not recommended if you want to keep it in your stomach.
3) There's likely been some research done into it, but it's nothing exceptional. Replicator food is comparable to flavoured tofu or a military ration, reformed into more appealing foods by way of the enhanced replicator. In other words, they're made appetizing in part through natural magic, and as that magic fades away, so too does the edibility.
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2) Replicator goo would be a slow transition similar to mold as the food item goes bad over time. By the time it is fully inedible, it becomes a grey-ish paste and loses consistency. You can still eat it, but it's not recommended if you want to keep it in your stomach.
3) There's likely been some research done into it, but it's nothing exceptional. Replicator food is comparable to flavoured tofu or a military ration, reformed into more appealing foods by way of the enhanced replicator. In other words, they're made appetizing in part through natural magic, and as that magic fades away, so too does the edibility.