Some of the world’s most memorable foods also require the greatest care in how they’re prepared.
Many parasites that affect humans are not found in food because the ingredients are unusual—they’re present because certain animals or aquatic plants can naturally carry them if they are eaten raw or undercooked. Fortunately, these infections are largely preventable with proper food handling and cooking.
Freshwater crabs and crayfish, for example, can carry lung flukes (Paragonimus species). People become infected by eating these crustaceans raw or insufficiently cooked. Once inside the body, the parasites typically migrate to the lungs, where they may cause a persistent cough, chest pain, or coughing up blood—symptoms that can resemble other respiratory illnesses and make diagnosis challenging.
Undercooked frog meat, including frog legs, has also been linked to certain parasitic infections in parts of the world. One example is sparganosis, caused by the larval stage of Spirometra tapeworms. Although uncommon, the larvae can migrate through body tissues and, in rare cases, affect the eyes or central nervous system, making proper cooking especially important.
Freshwater fish deserve similar attention.
Depending on the species and where they are caught, raw or undercooked freshwater fish may harbor parasites such as fish tapeworms. Some tapeworm species can interfere with vitamin B12 absorption, potentially contributing to fatigue, anemia, and other health problems if left untreated. Proper cooking—or commercial freezing methods used for certain raw fish preparations—greatly reduces this risk.
Even vegetables can occasionally play a role.
Aquatic plants such as watercress may become contaminated if they grow in water containing parasite larvae from infected animals. Washing alone may not remove every organism, making it important to obtain produce from reputable sources and prepare it according to food safety recommendations.
The good news is that these risks are well understood, and they are largely preventable.
Simple precautions make an enormous difference:
- Cook freshwater fish, crabs, crayfish, frogs, and other high-risk foods thoroughly.
- Purchase seafood, meat, and produce from reputable suppliers that follow food safety standards.
- Practice good kitchen hygiene by preventing cross-contamination between raw and cooked foods.
- Wash hands, utensils, and preparation surfaces after handling raw ingredients.
- Follow public health guidance for safely preparing foods that are traditionally served raw or lightly cooked.
Food should inspire enjoyment, not unnecessary fear.
Millions of people safely enjoy seafood, freshwater fish, and traditional regional dishes every day because they are prepared properly. Understanding where risks exist allows us to appreciate these foods with confidence rather than anxiety.
In the end, food safety isn’t about avoiding remarkable ingredients.
It’s about respecting them.
With careful sourcing, good hygiene, and thorough preparation, you can enjoy the rich diversity of the world’s cuisines while keeping both the meal—and everyone at the table—as safe as possible.
