Is reheated rice dangerous?

You've probably heard someone say you shouldn't reheat rice. Then someone else says they've been reheating rice their entire life and they're perfectly fine. So what's actually going on?

The problem isn't simply reheating rice. The important part is how cooked rice is handled and stored before you reheat it.

Why does cooked rice need special attention?

Uncooked rice can contain spores of a bacterium called Bacillus cereus. Those spores can survive cooking. If cooked rice then spends too long at temperatures where bacteria can grow, Bacillus cereus can multiply and produce toxins. Some of those toxins aren't destroyed simply by reheating the food later. That's why reheating badly stored rice doesn't magically make it safe again.

Cool cooked rice promptly

If you're keeping cooked rice for later, don't leave the pot sitting on the bench for hours. Food Standards Australia New Zealand advises cooling cooked food quickly and putting it into the fridge or freezer once it stops steaming. Dividing larger quantities into smaller containers can help food cool more quickly. Your fridge should be 5°C or colder.

Remember the temperature danger zone

Potentially hazardous foods — including cooked rice — generally need to be kept at 5°C or colder or 60°C or hotter. FSANZ's useful 2-hour/4-hour rule says food that has been between 5°C and 60°C for:

Less than 2 hours: can be eaten or refrigerated again.

2–4 hours: can be eaten immediately but shouldn't be returned to the fridge.

More than 4 hours: should be discarded.

And that time is cumulative.

How long can you keep cooked rice?

FSANZ's consumer guidance for reducing Bacillus cereus risk recommends keeping leftovers refrigerated or frozen and disposing of refrigerated leftovers if they haven't been eaten within 3–4 days; it advises a shorter timeframe for vulnerable people. If you know you aren't going to use the rice soon, freezing portions is a useful alternative.

Can you trust the sniff test?

No. This is one of the most useful food-safety lessons to learn: Dangerous microorganisms don't necessarily make food smell, look or taste bad. Food can appear completely normal and still be unsafe. So “it smells fine” isn't enough information.

So can you reheat rice?

Properly handled leftover rice can be part of another meal. The key isn't being afraid of leftovers. It's building good habits:

• Cool food promptly.

• Refrigerate it properly.

• Keep track of how long you've stored it.

• Don't leave it sitting at room temperature for hours.

Because food safety doesn't need to make cooking frightening. It just needs to become part of knowing what you're doing in a kitchen.

For detailed Australian guidance, see Food Standards Australia New Zealand's advice on Bacillus cereus.