编辑一篇英语段落，使其更加流畅和易于阅读。
Before editing: 
In today's world, many people are suffering from health problems, such as obesity and heart disease. These problems are often caused by poor diet and lack of exercise. However, people can prevent these problems by eating a healthy diet and exercising regularly. A healthy diet should include plenty of fruits and vegetables, as well as lean protein and whole grains. In addition, people should try to exercise for at least 30 minutes a day, whether it be by going for a walk or playing a sport.
After editing:
Health problems, such as obesity and heart disease, plague many individuals in today's world. These issues are frequently attributed to unhealthy eating habits and sedentary lifestyles. However, practicing a healthy diet and incorporating regular exercise can prevent these problems altogether. A balanced and nourishing diet should consist of an abundance of vegetables, fruits, lean proteins, and whole grains. Furthermore, regular physical activity, even a brisk walk or engaging in a sport, for at least 30 minutes per day, is crucial to maintaining optimal health.