According to [1], there are 15 specific foods that can be harmful to cats. These include items like chocolate, grapes, onions, and garlic. The article notes that these foods can cause various issues in cats, ranging from digestive problems such as diarrhea and vomiting to more severe symptoms including jaundice (yellowing of the skin) and even death.
[2] expands on this by mentioning toxic plants for both dogs and cats. It states that one accidental bite is enough to potentially lead to health issues, with symptoms often not appearing until hours or days later. The article highlights that while there are many toxic foods listed, exposure rates have been decreasing over time.