Why do they charge more on healthy food?

Fastfood is so bad for you. I use to eat every type of fast food in the world. It tastes really good and it's really cheap. Now that I think about it, I rather spend a couple of more bucks and eat something healthier. I don't get how they make you pay $10.00 for a bowl of salad and complain how America is getting fat. There are so many people who choose to eat fast food because it's cheap. Teenagers who don't have jobs, don't get to spend a lot of money which leads them to buy fast food. Even at Stony Brook University, all the healthy foods are overly priced. College students already pay so much money for text books and tuitions and don't carry as much money than people who work. I think that Stony Brook University over charges and when it's time for them to judge people on what they eat. They criticize Americans for eating unhealthy and overcharge all the healthy foods.