Which measures are considered effective for preventive healthcare in adulthood?

The effectiveness of preventive healthcare in adulthood is best represented by measures that promote overall physical and mental well-being. Engaging in regular exercise, learning relaxation techniques, and maintaining proper nutrition are all foundational components that contribute to a healthier lifestyle. Exercise helps to reduce the risk of chronic diseases, improves cardiovascular health, and boosts mental health by reducing stress and anxiety. Learning relaxation techniques can further enhance stress management, which is crucial in preventing various health issues. Proper nutrition, which involves a balanced diet rich in essential nutrients, supports bodily functions and helps to prevent obesity and related conditions. Together, these practices create a holistic approach to maintaining health and preventing illness throughout adulthood.

In contrast, the other options present approaches that either suggest unhealthy habits or lack the comprehensive focus on prevention that is necessary for effective healthcare.