Answer:
Dear brother, please do not eat junk food because it is harmful to your body. All though junk food may taste good it is very unhealthy for you for many reasons, here are a few. To begin with, it contains a lot of unhealthy oils. Second off, it can also be processed food which isn't good for you. Last but not least, it can give you heart burn, and that is why you do not head junk food.
Sincerely your loving sibling.