Select the correct text in the passage.
in this excerpt from an essay, which sentence provides the main idea?

fast food chains are on every corner of every town. you can get a quick and cheap meal of a burger, fries, and a soda in minutes. but the next time you think about stepping into a fast food restaurant, think about what you’re doing to your body first. regularly eating fast food can cause all sorts of health problems, such as diabetes, obesity, heart disease, and even cancer. there’s a reason fast food is also called junk food. it is food that is high in fat and calories, with very low nutritional value. so do your health a favor—give the fast food a pass and get a salad instead!