You'd be amazed at just how much tolerance human guts can develop for this kind of thing. I recall reading about a hunter-gatherer tribe the discoverer ran across just going to town on horribly rotten carrion. The more rotten the better.
If your immune system becomes suppressed or you become injured, then you're skating on very thin ice.
We've known this for a very long time. There's a reason refrigerators are popular.