A 56-year-old woman believed she was doing everything right to stay healthy. She rarely ate fried foods, never drank alcohol excessively, and maintained a generally healthy lifestyle.

So when routine blood tests revealed abnormal liver function, she was completely shocked.

During a detailed consultation, doctors discovered that the problem wasn’t her diet or lifestyle—it was a long-standing habit of trying to avoid food waste.

The Hidden Habit That Concerned Doctors

The woman admitted that whenever foods such as wood ear mushrooms, snow fungus, or peanuts became damp, she would simply dry them in the sun and continue eating them.

She also refused to throw away rice, noodles, or other dry foods that had developed an unusual smell because she felt it would be wasteful.

Doctors immediately recognized the potential danger.

According to them, foods that have become damp or moldy may contain aflatoxins, toxic compounds produced by certain molds.

What Is Aflatoxin?

Aflatoxin is produced by molds belonging to the Aspergillus family.

The World Health Organization (WHO) and the International Agency for Research on Cancer (IARC) classify naturally occurring aflatoxins as Group 1 carcinogens, meaning there is sufficient evidence that they can cause cancer in humans.

Long-term exposure has been associated with:

• Liver cancer
• Chronic liver damage
• Liver inflammation
• DNA damage in liver cells

Because aflatoxin primarily targets the liver, repeated exposure over many years may significantly increase the risk of liver disease.

Why Cooking Doesn’t Solve the Problem

Many people believe that washing or thoroughly cooking food makes it safe.

Unfortunately, that’s not always true.

Unlike many bacteria, aflatoxin is highly heat-resistant.

Normal cooking methods—including boiling, stir-frying, steaming, and frying—cannot reliably destroy the toxin once it has formed.

That means mold-contaminated food may remain dangerous even after being cooked.

Foods Most at Risk

Doctors warn that aflatoxin is not limited to obviously moldy food.

It can develop in foods that have been stored under warm and humid conditions, including:

• Peanuts
• Rice
• Dried mushrooms
• Dried noodles
• Corn
• Grains
• Beans
• Some vegetable oils made from contaminated crops

The toxin may already be present even when only a small area appears moldy.

Hidden Sources Around the Home

Doctors also pointed to several commonly overlooked sources of contamination:

• Damp grains and nuts stored for long periods.
• Reused dried foods that became wet and were dried again.
• Old cooking oils stored improperly.
• Cracked wooden cutting boards.
• Wooden chopsticks with black mold or deep cracks.

These items can create conditions that encourage mold growth if not properly cleaned or replaced.

Five Ways to Reduce Your Risk

Health experts recommend several simple precautions:

• Buy only the amount of grains and nuts you can use within a reasonable time.
• Store dry foods in airtight containers in a cool, dry place.
• Throw away any food with mold, a musty smell, or a bitter taste.
• Replace cracked wooden cutting boards and worn wooden utensils regularly.
• Have regular health checkups, especially if you have hepatitis B, hepatitis C, fatty liver disease, or other liver conditions.

The Bottom Line

Trying to save food by keeping damp or moldy ingredients may seem economical, but it can come at a much higher cost.

Doctors stress that once mold develops, removing only the visible portion is not enough, because toxins may already have spread throughout the food.

Sometimes, the safest—and healthiest—decision is simply to throw it away.