Read this paragraph.
Kale, collards, spinach, and broccoli are vegetables referred to as "greens" by nutritionists. They contain high doses of fiber, vitamins, and minerals. Every diet should contain servings of these leafy greens because they contain substances that are proven lines of defense against heart disease and diabetes. The darker the green, the better the health benefits.
What is the author’s purpose for writing this paragraph?
to inform readers about the vitamins in leafy greens
to persuade readers to eat greens for their health
to persuade readers to learn about dangerous diseases
to entertain readers with a personal story about heart health