Final answer:
The nurse should advocate for the older adult to consume adequate calcium to promote bone health and prevent fractures.
Step-by-step explanation:
The nurse should advocate for the older adult to consume adequate calcium. Calcium is essential for healthy teeth and bones, which is especially important for older adults who may be at risk for osteoporosis. Including foods rich in calcium, such as dairy products, leafy greens, and fortified foods, can help promote bone health and prevent fractures. It is important to note that the other options listed - increasing carbohydrate intake, limiting protein intake, and decreasing fiber intake - may not be appropriate recommendations for all older adults and should be individualized based on their specific health needs and goals.