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3. Arrowhead
Nutritious as it may be, arrowhead provides an ideal surface for parasites to attach. When eaten undercooked, these organisms can easily enter the body and trigger infections.
4. Water Caltrop

Often eaten raw for its sweet, nutty taste, water caltrop can harbor worms that lead to stomach pain, diarrhea, and even anemia if consumed without proper cooking.
5. Lotus Root