There are some things in the kitchen that seem so ordinary that we rarely stop to think about them.

A bag of peanuts sits in the pantry. A container of cornmeal rests on a shelf. Rice, flour, spices, or nuts are stored away for weeks or even months, waiting patiently to become part of the next meal.

Most of the time, there is nothing unusual about this.

But then one day, you open a container and notice something that makes you pause.

Perhaps the food smells different. Maybe you see discoloration. Perhaps there is visible mold, unusual moisture, or insects around the package.

Your first thought might simply be, “I’ll throw it away.”

And that’s exactly what you should do.

But there is a deeper reason why proper storage of certain foods matters. Under warm, damp, or poorly controlled conditions, some molds can grow on agricultural products and produce substances called mycotoxins. Among the most important of these are aflatoxins, naturally occurring toxins associated with certain molds.

Long-term exposure to aflatoxins is a recognized risk factor for liver cancer. The World Health Organization and the U.S. Food and Drug Administration both identify foods such as peanuts, corn, some grains, tree nuts, and certain spices as products that can be susceptible to aflatoxin contamination.

That doesn’t mean every moldy peanut or improperly stored bag of flour is going to cause cancer.

It doesn’t.

Food safety is rarely that simple.

Instead, the lesson is much more practical: the way we store food can help reduce conditions that allow molds to grow, and avoiding visibly moldy or spoiled food is an important part of protecting ourselves.

The Story That Made Me Look More Closely at My Pantry

I remember hearing a story about a couple who had both been diagnosed with liver cancer.

The detail that caught everyone’s attention was the suggestion that their food-storage habits might have played a role.

Stories like this can be frightening because they make something completely ordinary—putting food away in the kitchen—suddenly feel dangerous.

But there is an important distinction that often gets lost in dramatic stories online.

You cannot look at one family and conclude that a particular storage habit caused their cancer.

Cancer usually has multiple possible risk factors, and determining the cause of an individual person’s cancer requires medical investigation.

What we can say is that scientists have established a genuine connection between significant aflatoxin exposure and liver cancer.

That distinction matters.

It allows us to take food safety seriously without turning every old bag of rice or jar of nuts into something terrifying.

What Exactly Are Aflatoxins?

Aflatoxins belong to a larger group of substances called mycotoxins.

Mycotoxins are toxic compounds produced by certain molds. They can occur in agricultural products before harvest or after harvest, particularly when food is exposed to conditions that encourage fungal growth.

According to the World Health Organization, aflatoxins are produced primarily by certain species of Aspergillus molds. They can contaminate crops including cereals, peanuts, tree nuts, oilseeds, and some spices.

The important point is that the mold itself isn’t the entire story.

Certain molds can produce toxins, and those toxins may remain in food even when the visible signs of mold aren’t obvious.

That’s one reason food safety authorities take aflatoxin contamination seriously.

The FDA notes that environmental conditions such as temperature and humidity influence whether these molds grow and whether aflatoxins develop in food.

Why Is the Liver So Important?

The liver is one of the body’s most important organs.

It helps process nutrients, produces substances needed for digestion, stores energy, and helps process many substances that enter the bloodstream.

Because the liver plays such a central role in processing chemicals and nutrients, it can also be affected by certain toxic substances.

Aflatoxins are particularly concerning because some forms can damage cells and DNA.

The strongest concern involves aflatoxin B1, one of the major aflatoxins.

Research and international health assessments have established that aflatoxin exposure can contribute to liver cancer in humans. The relationship can be especially important in populations where exposure is frequent and hepatitis B infection is also common.

This doesn’t mean occasional exposure automatically leads to cancer.

Cancer risk depends on factors such as the amount and duration of exposure, along with other individual risk factors.

The practical lesson is much simpler:

Reducing unnecessary exposure to aflatoxins is a good food-safety habit.

Which Foods Are Most Susceptible?

Aflatoxins are not found equally in every food.

Some agricultural products are more susceptible than others.

Peanuts

Peanuts are among the foods commonly associated with aflatoxin contamination.

This doesn’t mean ordinary packaged peanuts are unsafe. Commercial food systems have controls designed to reduce contamination.

However, peanuts that have been improperly stored—particularly in warm, humid conditions—can become more vulnerable to mold growth.

Corn

Corn and corn-based products can also be susceptible.

Poor drying and storage conditions can encourage fungal growth, which is one reason proper handling of harvested grains is important.

Tree Nuts

Certain tree nuts, including pistachios and other nuts, can also be affected.

If nuts become damp, develop visible mold, change dramatically in appearance, or smell abnormal, they should not be treated as something that can simply be “saved.”

Grains

Certain grains and cereals can be vulnerable to different mycotoxins.

This is particularly relevant when grains are stored for long periods under warm or humid conditions.

Spices

Some spices can also become contaminated with mycotoxins.

That is another reason to purchase spices from reputable sources, keep them dry, and avoid using products that have clearly deteriorated.

The WHO specifically lists cereals, nuts, dried fruits, and spices among food categories in which mycotoxins may occur.

Why Moisture Is Your Pantry’s Enemy

If there is one thing to remember about storing dry foods, it is this:

Keep them dry.

Moisture creates an environment in which molds can thrive.

Imagine a bag of rice sitting in a dry pantry.

Now imagine that same bag being stored somewhere humid, exposed to condensation, leaking water, or repeated contact with moisture.

The second environment is much more favorable for mold growth.

The USDA similarly notes that foods such as rice, cereal, pasta, and dried mixes may develop mold if they are exposed to dampness.

That’s why airtight containers can be useful for many dry foods.

They aren’t magical shields against every food-safety problem, but they can help protect dry products from moisture, insects, and environmental contamination.

Choose the Right Place to Store Dry Foods

Your pantry doesn’t need to look like a professional warehouse.

A few simple habits can make a meaningful difference.

Look for a location that is:

Cool
Dry
Clean
Away from direct sunlight
Protected from insects and rodents
Free from leaking pipes or condensation

Avoid storing dry foods next to a dishwasher, oven, sink, or other source of heat and moisture when possible.

A beautiful kitchen can still have surprisingly humid areas.

And sometimes the place that seems convenient isn’t actually the best place for long-term food storage.

Don’t Ignore Damaged Packaging

Here’s another habit that is easy to overlook.

When you bring food home from the store, look at the packaging.

Is the bag torn?

Is the box wet?

Is there a hole in the package?

Are there signs of insects?

Does the container appear swollen, leaking, or otherwise damaged?

Damaged packaging can allow moisture, insects, or contaminants to enter.

The USDA recommends checking dry-food packaging for holes that could allow moisture or insects inside.

Sometimes the safest choice is simply not to keep a compromised package.

What If You See Mold?

This is where many people make a mistake.

They see a little mold and think:

“It’s only on the surface. I’ll scrape it off.”

Unfortunately, that isn’t always safe.

Mold can penetrate certain foods beyond what is visible, and some molds can produce mycotoxins.

The WHO specifically warns that molds capable of producing mycotoxins can grow on a variety of crops and that the toxins may penetrate deeply into food.

For foods that are visibly moldy and shouldn’t be salvaged, the safest approach is disposal rather than trying to remove the affected portion.

The USDA also recommends discarding food that is covered with mold and cleaning the area where the moldy item was stored.

And there’s another useful tip:

Don’t deliberately smell moldy food closely.

If you’re inspecting something and see obvious mold, you don’t need to put it near your nose to investigate further.

Does Cooking Destroy Aflatoxins?

This is an important misconception.

People sometimes assume that if contaminated food is cooked thoroughly, every potential toxin will simply disappear.

Unfortunately, mycotoxins are not necessarily eliminated by ordinary cooking.

The WHO notes that many mycotoxins are chemically stable and can survive food processing.

That’s one reason prevention matters.

Instead of relying on cooking to “fix” questionable food, it is better to prevent contamination and avoid food that has clear signs of mold or deterioration.

What About Food Stored in the Refrigerator?

Refrigeration is extremely useful for many foods, but not every food belongs in the refrigerator.

Dry goods such as rice, pasta, cereal, flour, and similar pantry products generally need to be kept dry rather than simply being placed somewhere cold.

The USDA recommends storing shelf-stable and dry foods appropriately and notes that dry products can develop mold when exposed to dampness.

For foods that do require refrigeration, such as many dairy products, meats, and prepared foods, follow the storage instructions on the package and keep the refrigerator at a safe temperature.

In other words, don’t think of “cold” as the only rule.

Think about the specific food.

The Difference Between Food Safety and Fear

After learning about aflatoxins, it’s easy to become overly cautious.

You might start looking at every peanut and every grain of rice suspiciously.

That’s not necessary.

Food safety is about reducing avoidable risks—not living in fear of food.

Commercial food systems have testing and regulatory controls designed to limit certain contaminants. The FDA, for example, establishes action levels for aflatoxins and monitors food for these contaminants.

The goal at home is simply to complement those systems with sensible habits.

Buy food from reputable sources.

Store it properly.

Keep dry foods dry.

Use clean containers.

Rotate older products.

Inspect packaging.

Throw away obviously moldy or spoiled food.

Those habits are simple, but they are worthwhile.

The Food Storage Mistake That Could Put Your Health at Risk: What Aflatoxins Have to Do With Liver Cancer