When dealing with a psychiatric patient expressing fear about food, a nurse should:

Encouraging participation in meal preparation is an effective approach when dealing with a psychiatric patient expressing fear about food. Involving the patient in meal preparation can help them regain a sense of control and autonomy, which is often beneficial for individuals experiencing anxiety or fear related to food. This approach also allows the nurse to establish trust and build rapport, creating a supportive environment where the patient can express their feelings and concerns more freely.

Additionally, participation in meal preparation can serve a therapeutic purpose. It may help the patient become more familiar with food and cooking processes, thereby gradually reducing their anxiety. Engaging in a structured activity such as preparing food can distract from their fears and promote a sense of normalcy.

The other choices do not address the patient's feelings adequately or may even exacerbate their fears. Simply ignoring feelings can lead the patient to feel invalidated and more anxious. Providing food without explanation fails to address the root of their fear and may heighten anxiety. While reassurance about the safety of food can be comforting, it may not be sufficient on its own to help the patient cope with their underlying issues regarding food.