Many children like junk food. It's bad for their health. Their parents don't want them to eat too much junk food. Also, they know it's not a good habit, they still eat it. Some of them eat this kind of food every day. Some only eat once or twice a week.
Paul is a schoolboy. He is 12 years old now. He likes junk food very much. He eats it every day, so he is kind of unhealthy. He doesn't do exercise often. When he has money, he'll buy junk food, his parents worry about him.
But, he says, maybe I'm not very healthy, but I enjoy myself.