Final answer:
Nancy should be aware that it's normal to gain a small amount of weight with age and maintaining a healthy weight through a balanced diet and regular physical activity is crucial for preventing health issues.
Step-by-step explanation:
Nancy, who has gained only a small amount of weight between the ages of 25 and 50 and is of average weight, should understand that maintaining a healthy weight is important for overall well-being. Slight weight changes over time are not uncommon, and as long as she is not experiencing any negative health outcomes, this small weight increase may be considered normal.
It is essential to balance calorie intake with physical activity and to follow a nutritious diet to prevent potential health issues such as type 2 diabetes and heart disease. Those who manage to maintain a healthy weight often make careful choices about what they eat and stay physically active, which is more effective than yo-yo dieting, which can be harmful in the long term.