Doctors Warn: These 4 Popular Foods Can Carry Parasites If They’re Contaminated or Undercooked

They look completely ordinary.

You may have eaten them for years without giving them a second thought.

But doctors and food-safety experts warn that certain foods can sometimes carry parasites or other harmful organisms when they are contaminated, improperly handled, or not cooked thoroughly.

And the surprising part?

You don’t always know there’s a problem just by looking at the food.

Here are four foods that deserve extra attention:

1. Undercooked Pork

Raw or insufficiently cooked pork can carry certain parasites, including Trichinella and Taenia solium (pork tapeworm).

Proper cooking is one of the most important ways to reduce the risk.

2. Raw or Undercooked Fish

Some freshwater and marine fish can contain parasitic worms. Eating raw fish can therefore carry a higher risk if the fish hasn’t been handled and prepared according to food-safety standards.

This is one reason restaurants and food producers follow specific freezing and preparation requirements for fish intended to be eaten raw.

3. Undercooked Beef

Beef can occasionally be contaminated with tapeworm larvae.

Eating beef that is thoroughly cooked reduces this risk.

4. Unwashed Fruits and Vegetables

Parasites don’t only come from meat.

Fresh produce can become contaminated through soil, water, handling, or contact with contaminated surfaces.

That’s why washing produce thoroughly under running water is an important food-safety habit.

The Most Important Point

This doesn’t mean you need to stop eating these foods.

The risk comes from contamination and improper preparation—not from the food itself.

Cook meat and fish appropriately, wash fresh produce, prevent cross-contamination in the kitchen, and follow food-safety guidance when preparing foods that are normally eaten raw.

And if you develop persistent symptoms such as unexplained diarrhea, abdominal pain, weight loss, or other concerning symptoms after a suspected exposure, speak with a healthcare professional rather than trying to diagnose a parasite yourself.

Sometimes the simplest food-safety habits can make the biggest difference.