Write a letter to Josh explaining why it is very unhealthy to eat fast food?

junk food=fast food

dear Josh,

as you know ,junk food is very popular nowadays.It's cheap and tasty, but there are a lot of disadvantages of eating such food,for example , you'll get fat because of the large amount of calories , besides if you eat fast food very often you'll have stomach ache and other illnesses. By the way, if you want to be in a good shape you should eat only healthuy food such as:vegetables, meat and fruit.

Well,i think if you want to be healthy ,strong , keep fit and do not want to spoil your health, you  won't eat to much junk food and drink harmful drinks and you'll lead a healthy lifestyle.