After a nasty bout of food poisoning lasting nearly 5 days (rare I know) my trust levels and appetite for certain foods have dropped considerably however my inquisitiveness kicked in…
…from a data perspective (ignoring allergies) which foodstuffs are almost guaranteed or are actually guaranteed to never induce food poisoning in a human being?
My first thought ran to protein powders mixed with certified-safe tap water.
I assume that all raw meat runs the possibility and all take-away or restaurant meals are discounted as well. I know fruit and vegetables fertilised with human manure in certain countries which potentially rules out fresh fruit and veg.
Are there any foodstuffs guaranteed to be completely safe? Beef jerky perhaps due to the dehydrated nature?
Best Answer
There is almost no food which is guaranteed to be safe. If it has nutritional value for a human, it has nutritional value for many microorganisms too, some of which are human pathogens.
So, out of the FATTOM rule, you can already throw out F: you cannot remove the food. A is also not a good candidate - no food is naturally acidic enough, and while there are foods preserved by acidity, an error in processing can lead to the food being dangerous. Also, there are some bacteria and molds which thrive in quite acidic environments (although few of them are pathogens). Oxygen is even worse, as botulinum is anaerobic and very dangerous. Also, once you open the canned food, it can get contaminated again.
Time and temperature are quite good, but they are no guarantee for no food poisoning. First, processing errors are common. Second, you can't sterilize the food in a normal pot, and the remaining bacteria resume multiplying even before it's cooled off enough to eat. And, if it was contaminated before the cooking, the pathogens can have produced temperature stable toxins before you cooked the food.
Moisture is probably the only factor which can produce completely safe food. Most dehydrated food is not 100% safe. Beef jerky, cured hams, dehydrated fruit, nuts and similar can easily grow toxic mold during improper storage. Depending on how much water was removed in the preservation process and where you live, the kitchen shelf can turn out to be "improper storage". Flours are quite safe too, but you have to cook them, and the cooked product is again not guaranteed to be safe.
The only foods which will be completely safe will be the ones which never had any moisture to begin with, and will remain bactericidal if they acquire some moisture from the air. So sugar (either granulated, or hard candy),salt and pure oil can be declared safe from pathogens, but not from some kind of factory mishap where toxins can have contaminated the sugar and oil. A protein powder may fall in this category, I'm not completely sure how little moisture would be sufficient for a mold to grow on it.
And don't forget that you can infect yourself with digestive tract pathogens by handling the food with contaminated utensils or fingers, even if they don't get the chance to build a colony in the food. You could in principle hold your dining room clean to operation room standards, but people get infections in operation rooms too.
Nutrition is off topic for this site, so I won't discuss the wisdom of eating nothing but sugar, oil, salt and boiled water in order to eat guaranteed pathogen free food. For me personally, the trade off is absolutely not worth it.