Canadian living in Australia. Omnivore.

Kicker: Food technologist and health inspector. AMA.

Tl;dr: Doesn't matter if it's meat or veg. It goes in the fridge. Follow 2h/4h rule. Edit: Should specify certain veg are potentially hazardous as soon as you cut in to them, like leafy greens. All cooked or partially veg that should be treated like meat.

For work, I'm fairly strict in businesses because the food can go anywhere once it's in the hands on the customer, even in restaurants or at home. You can look at your dine in customers and they all look healthy, but what if they're not, or where do the leftovers go? Do they take it home after date night to share some with little Bobby or Grandma Jane? In business, you do what you can to keep the food as "clean" as you can.

At home and in food businesses, handwashing is ALWAYS a problem. Food handlers are always touching their faces, phones, hip towel they've had on all day, touching a towel they use used to wipe their hands after only rinsing hands in water in the sink, and then touching lettuce for a salad. So even at home, you can cook things to keep bacteria, but is the scoop, container, and your hands clean? Dust, pollen, flies, hairs, etc also carry microbes, and if any of them fall in to food after its been cooked, the bacteria can grow.

It also depends on the type of bacteria, too. Salmonella can infect at an extremely low dose, and Staphylococcus infects at very high doses.

I follow the 2h/4h rule for anything potentially hazardous. Of course, at home, I'm a bit more flexible, usually +/- 1h. If I make myself sick, alright, but there's no way I'm going to make anyone else sick, so if I'm making food for others, I keep to the strict rules. I'm also generally more risk adverse because the thought of anything involuntary coming out either end makes me sick just thinking about it.

I think the amount of time a food stays out is cultural, and if you grew up with it, your gut will have gotten used to the levels of bacteria. Us westerners generally get sick drinking tap water in certain countries when the locals are fine. I used to live with a Japanese lady for a year, and she knew what I did for a living. She always left rice out all night and ate it the next day. One day, she came to me with it and said "does this smell weird?" and it was a definite yes from me. I'd never leave cooked rice out that long and feel comfortable eating it.

So yeah, Bacillus cereus or whatever bacteria present may not occur all the time, but it does happen. Imagine making large batches and serving to large numbers of unrelated people.

Another thing: Cool foods within 2h to a reasonable temperature (I say 40C is fine) before putting it in the the fridge uncovered. If you put hot food in the fridge, you run the risk of warming up the foods already in the fridge.

Wash your hands.

And use a thermometer. Make sure it's clean before you use it.

Thanks for listening to my Ted Talk.

Anecdotal evidence rules! Everyone posting here is alive!
The estimated 420,000 folks who die annually from improper food and water handling refuse to post!!!
Great stuff!

This is a thing pushed by American media. It's a Boomer-era panic over summertime picnics and somehow mayonnaise causing potato salad to immediately after 30 minutes outside a refrigerator to become fatal if consumed.

It's also the product of misunderstandings of buying meat at a supermarket, wrongly assuming that meat that is not refrigerated for more than 15 minutes will basically kill you.

Panicking about food poisoning is a moral panic about "bad parenting" and blaming people when it wasn't widely known what causes food poisoning: not washing your filthy hands, cross-contaimination, and poor hygiene overall.

I've lived in West Africa and bought and cooked and safely eaten meat that had sat on a wooden plank lightly covered in flies before I got there to buy it. I survived. Mayonnaise will outlive humanity before it molds or goes bad at room temp.

Meat eater from the UK. I'll leave stuff out for varying amounts of time, just smell it before I eat it or have a trial spoon first.

Never had any food poisoning in my life and I have eaten some very questionable things for sure.

In my personal opinion people wildly over exaggerate stuff like this and dates on packaging. My nose knows.

Vegetarian/Germany. I'll leave food on the counter too as long as I'm still planning to eat it the same day. Never had issues. If I'm planning to only eat it the next day, I'll refrigerate it.

I leave food on the counter all the time, because If I'm still hungry in a little while, I don't want my food cold. I have never in my life gotten food poisoning from it.

90% Vegetarian. Chicken and Fish meat only. Canada.

I used to be a chef so I follow food safety guidelines with some wiggle room, since commerical kitchen standards are supposed to protect all kinds of people in a wide variety of circumstances, while I'm fairly healthy and in control of my kitchen/storage.

I don't let food that's supposed to be hot sit at room temperature for more than 2hrs max. I keep most starchy fruit and root veggies in loose, hanging bags and berries/greens/less starchy vegetables in the fridge. I usually only buy meat if I'm using it that day, only keep leftovers in the fridge for two-to-three days, and freeze anything else.

Super basic explanation: Bacteria are on anything not sterile or on fire. Most are harmless on their own but some produce shit that makes you sick. Like botulism is caused by the toxin the bacteria produce and not the bacteria itself, and it's found on vegetables. The bacteria (if they're not endospores) die with heat but the toxin remains. And with food production all mingled, bacteria from meats can be transferred to non-meat products, too. You can even get sick from raw flour.

Cooked foods have more available sugars and nutrients for bacteria to eat, plus warmth and moisture, so it's a great environment for bacteria to break out of hibernation, make babies and poop toxins.

Leaving cooked starchy foods out in ideal bacteria party conditions isn't great, and food poisoning isn't always throwing up and shitting your guts out. Sometimes it's a slight headache or a sore throat, and it can happen days or months after the fact. Ever had a 24 flu? Unexplained weird anxiety and a tummy ache that goes away after a day? Food poisoning happens to about 1/10 people worldwide every year.

But whatever, it's about how much risk you want to take on.

Omnivore, European. I leave my food outside if I plan to eat it the same day, and wait till it has reached room temperature before I put it in the fridge. Most of the time we leave food in a small room we have which is slightly cooler than living room (16ish degrees in winter I think) and it stays good for as long as there is food left. I have also eaten food that was left in kitchen at room temperature for about two days, but only once or twice with highly acidic food (chili or bolognese).

As long as it smells good and looks good, it’s good. Never had food poisoning in my life.

Omnivore/Central Europe:

I am pretty special in my needs because i hate eating leftovers when they were out "too long" (where "too long" is a very random amount of time), so i normally wait until the food is room temperature; if i don't plan to eat within the next few hours it goes into the fridge pretty much instantly. But i know that this is my personal spleen and that it would be fine much longer.

Bread, any fruit, onions, potatoes, garlic and so on stay outside tho.

It's more important to make sure that your kitchen and cooking utensils are clean, and anything that was used for preparing meat doesn't get reused; and the dishes must be heated properly - that alone would mean it's probably save to stay out overnight if it's not 30°C in the kitchen in the midst of summer.

Dutch omnivore. I will sometimes leave something on the counter overnight. Usually when I made a big pan of something which I can't fit into the fridge. But it's something that will be reheated/boiled. Like a soup or stew. My wife complains about it everytime I do that though 😄

I didn't real the post BC I'm tired but I would like to say some places i worked in NYS had food guidelines for vegetables, meats, etc., and for seafood it just said "GET REAL" in all caps and I always read it in a sarcastic voice in my head lol.

I habituality leave pizza on the counter for breakfast the next morning but that's about the exception. Everything else I try to refrigerate before going to sleep for the night. I eat mostly veggie.

Meat eater, cooler climate in Australia.

We generally put things in the fridge but are also pretty casual about leaving things out.

There's a lot of variables that would effect my inclination to consume something that had been left out for whatever period of time.

Cooked Rice is almost a perfect growth medium for bacteria. My Mrs cooks a batch in the rice cooker, doesn't refrigerate it, but consumes it all within 36 hours. That said, it has just been boiled so you're starting with almost no bacteria.

Dairy is the worst. Letting milk get to room temperature and leaving it for a half hour or so is going to dramatically reduce it's lifetime even if you put it back in the fridge afterwards.

American/meat-eater

Bread stays out but is wrapped

Butter stays out in a butter bell (that's not a common thing in America BTW but they should be)

Some sauces and condiments and such that are packed full of salt and vinegar and such stay out

Leftovers and such go into the fridge after a few minutes to a few hours, there's not exactly a hard rule here, just kind of based on what feels right and whenever we get around to it. Overnight is too long, with few exceptions if it's been out that long we'd probably throw it out.

One exception to that is if I make stock, there's a good chance that's going to sit out for a good while to cool down. It takes a while to get a big pot of liquid down to a reasonable temperature to put in the fridge. I also figure it's been simmering for several hours, so odds are there's no bacteria alive in it, so I throw a lid on it to try to keep it that way, especially when I do it in the pressure cooker because it's basically been autoclaved at that point and it's staying in a pretty damn close to totally airtight vessel.

Most vegetables and fruits are fine out on the counter for at least a day or two, and some will last weeks or months depending on temperature, humidity, how much light they get, etc. but most of them last a lot longer in the fridge so that's where they go. Onions, garlic, potatoes, pineapples, and bananas always live outside of the fridge. Other things like apples, citrus, tomatoes, peppers may go either way depending on how fast I'm planning to use them and how much fridge space I have. Cut-up produce always goes in the fridge.

From the CDC website:

“Bacteria can multiply rapidly if left at room temperature or in the "Danger Zone" between 40°F and 140°F. Never leave perishable food out for more than 2 hours (or 1 hour if exposed to temperatures above 90°F).”

https://www.cdc.gov/food-safety/prevention/index.html