How to know if flour is spoiled? (5 easy methods)

In this brief guide, we are going to answer the question “How to know if the flour is spoiled”, discuss the different methods of identifying spoiled flour and the potential side effects of eating spoiled flour.

How to know if flour is spoiled?

If you are buying packaged flour then you may check with the expiry date on it. If you experience some unpleasant smell or have an unpleasant taste after eating it then this is because the flour is spoiled. If you see any kind of mold or insects in your flour then these are the obvious signs that the flour is spoiled.

Flour is the main pantry product obtained by grinding grains, cereals, or other food products into powder form. Although traditionally derived from wheat, many varieties of flour are now available, such as coconut, almond, and other various dishes.

Shelf life: 

A lot of factors can affect shelf life or how long it will take before it starts to get spoiled. Most of the flour remains fresh for 3-8 months at room temperature. When compared to storing them in cabinets, putting them in the refrigerator nearly doubles the storage life.

Types of flour:

Flour is often sorted based on health status, which affects durability. A source of materials such as corn or barley, all have different durabilities. For example, white flour remains fully fresh for a longer period than whole wheat flour, due to the way it is processed. White flour is very fine, meaning that the grain has been cleaned of bran and germ, leaving only a starchy endosperm.

5 methods to tell if the flour has spoiled? 

Expiry date:

For most packaged products that have an expiration date, the same data should be printed on the package to determine the amount of time they will stay fresh. However, you can consume it even after the expiration date if you inspect and see that there are no signs of spoilage in it. 


The best way to find out if your flour is safe and secure is if it is perceived by your sense of smell. Like fresh flour has a neutral smell, a bad flour that smells can be very unpleasant. It is a strong sign which tells us that the flour has been spoiled.


Huge clusters of mold may form if the flour got into touch with water. In this scenario, you should toss the entire packet out right away. Checking for fungal or mold growth on the flour is a fairly obvious indicator. If you find mold or fungus growing on the surface, it’s best to leave it alone and not eat it. If you eat fungus or mold, it may be highly harmful to your health.


If you observe insects eating the flour, it is best to leave them alone and not eat them. If you consume such flour, it can be harmful to your health since you are more likely to get an illness.


You may well not enjoy it, but this is just another useful technique to determine whether or not the flour is safe to eat. If the flavor is off, it has most likely been ruined. The fragrance of good flour is neutral, but the scent of poor flour is sour and musty.

Health effects:

Flour’s complex molecular structure changes as it becomes rancid, potentially releasing hazardous chemicals.

However, no recent research has found that consuming rotten flour has any negative consequences. Although cooked meals containing it may have a disagreeable flavor, they are unlikely to damage your health if consumed in moderation.

Moldy flour, on the other hand, is both hazardous and unpleasant to eat.

Although not all molds are hazardous, some do generate toxic compounds called mycotoxins. Symptoms such as vomiting and diarrhea may be triggered by these substances.

Based on the quantity consumed and the time of exposure, mycotoxins have also been related to other significant diseases such as cancer and liver problems.

As a result, if the flour smells foul or exhibits indications of fungus, it’s better to toss it out.

Other FAQs about Flour that you may be interested in.

What happens when adding flour to mashed potatoes?

Does almond flour go bad?

How long is flour good for?


In this brief guide, we answered the question “How to know if flour is spoiled?”, discussed the different methods of identifying spoiled flour and the potential implications of consuming spoiled flour.

We also discussed different types of flour and the shelf life of flour. Flour can remain good for about 8-12 months if properly stored. There were 5 easy methods to tell whether the flour has gone bad or not. We discussed in detail the health risks which can happen if we consume spoiled flour.

If you have any questions or comments please let us know.