5 Common Foods That May Carry Parasites — And How to Eat Them More Safely

The idea that everyday foods are “full of parasites” can sound terrifying, especially when dramatic images circulate online showing worm-like organisms supposedly removed from a person's mouth or digestive tract. But the reality is more nuanced.

Parasites can be transmitted through food, but most foods are not inherently contaminated, and simply eating a particular food does not mean you will develop a parasitic infection. The actual risk depends on the food, how it was grown or processed, whether it is eaten raw or undercooked, and how carefully it is handled.

Some foods, however, deserve extra attention because certain parasites have well-established links to them.

1. Raw or Undercooked Fish

Fish is one of the clearest examples of a food where preparation matters.

Certain parasites, including Anisakis, can be transmitted through raw or inadequately cooked marine fish and squid. This is why raw fish dishes such as sushi, sashimi, ceviche, or lightly cooked seafood require appropriate handling.

Anisakis infection can cause sudden abdominal pain, nausea, vomiting, and other gastrointestinal symptoms. In some people, the parasite can also trigger an allergic reaction.

This does not mean that sushi is automatically dangerous. Commercial seafood intended for raw consumption may undergo parasite-control procedures such as freezing, depending on local regulations and the species involved.

For home cooking, thoroughly cooking fish is one of the most reliable ways to reduce the risk.

2. Pork That Is Undercooked

Pork has historically been associated with Trichinella, a parasitic roundworm that can cause trichinellosis.