A healthy diet combined with physical activity is a great way to maintain good health throughout your life! A healthy diet means eating a variety of foods that provide the nutrients a person needs, without exceeding the recommended daily calorie intake, in proportion to their physical activity.A healthy diet combined with physical activity is a great way to maintain good health throughout your life! A healthy diet means eating a variety of foods that provide the nutrients a person needs, without exceeding the recommended daily calorie intake, in proportion to their physical activity.