First, fast food is more and more available everywhere. Today, there are many eating places serving fast food such as restaurants, cafeterias, fast food stands by the streets or even coffee shops. Besides, fast food is also very convenient. We can order it easily by telephoning the cafeterias, and right after that, they will deliver it to your home. Moreover, fast food is very delicious. For example, fried chicken, potatoes and hamburgers are so tasty and enjoyable that they become many people's favourite food. Therefore, several people have a tendency of eating fast food although it has little nutritional value.
Second, nowadays life is getting very busy. Many people have to work from eight to ten hours a day, so they do not have enough time to take their diet seriously. Therefore, some people only have two meals a day, and they often miss their breakfast, the most important meal in a day. Furthermore, after working all day, some people are very tired and have no time for cooking. Hence, they often go to fast food restaurants or order fast food to their homes for lunch and dinner to save time. In other words, the busy life makes a number of people tend to fall into unhealthy diet habits.
Last of all, in addition to the busy life, many people also lack of nutritional knowledge. Some people only prefer to eat