Maintaining a healthy weight is crucial for longevity as it helps reduce the risk of chronic diseases such as heart disease, diabetes, and certain cancers. A healthy weight also supports better mobility, enhanced mental health, and improved immune function. By maintaining weight within a healthy range, individuals can lead more vibrant lives, experience longer life expectancy, and enjoy a higher quality of life. Additionally, balancing calorie intake with physical activity fosters overall well-being, contributing to a positive cycle of health and fitness.