I’m suggesting a trait by which the survivor can eat rotten food items without penalty because there is a big disconnect in the food rot system vs reality.
I think that our lone survivor is maybe less than adventurous in their food choices, but historically or evolutionarily speaking the tradeoff between risks of sickness vs starvation has always been a pressure that determined our ancestor’s eating behaviors.
In game, many food items rot that don’t actually ‘rot’ in real life:
Cracklins, smoked meats like ham and hot dogs, and hard cheeses are specifically created to not rot, and last virtually indefinitely if you can keep them dry.
Jelly, jam, preserves, and ketchup will last an for years unrefrigerated if you just put the lid back on.
Canned goods last so long as the can is not breached. Even canned curry.
Even bread can be kept indefinitely if kept dry, hard, and stale.
Cooking meat that has been affected by microbes is a time honored practice common to many ancient and modern cuisines.
I don’t mean a little dry aged steak, I’m talking about fowl left out to the point where a modern American unskilled this in culinary practice would have trouble getting it to the trash can without gagging. I’m talking about heaps of dead fish (or even mice!) left to rot for months in a barrel of sea water, and then straining off the liquid for use as a condiment!
The Iron Stomach survivor would never worry about eating some moldy cheese, or a stinky ham sandwich. A strong resistance to salmonella and unpleasant odors would be a powerful advantage in a world with few food options and no refrigeration.
Also hobos should all start with this