Final answer:
The nurse should first obtain a diet history from the type 1 diabetes client before providing meal planning guidance. This allows for a personalized approach to managing diabetes through diet.
Step-by-step explanation:
The first action that the nurse should take when instructing a client with type 1 diabetes about proper meal planning is C: obtain a diet history that includes favorite foods and usual meal patterns.
Understanding the client's current dietary habits and preferences is essential for creating a personalized meal plan that the client is more likely to adhere to.
After obtaining this information, the nurse can then provide guidance on the importance of eating regular meals, the recommended caloric intake from carbohydrates, how to use the exchange list, and other nutritional guidelines.