"It tastes better with milk"
Milk is known for its richness in nutrients, calcium, and it's importance for our bones. Milk contains more than 9 other essential nutrients such as, protein, carbohydrates, vitamins ,minerals, and fat. Milk is also the #1 source of vitamin D, it helps keep your teeth healthy, and it helps prevent osteoporosis. Drinking milk is essential for children and teenagers because it helps prevent osteoporosis which is a condition that makes your bones weak and brittle. Osteoporosis is normally developed later in life and drinking milk while still young will help make your bones stronger.
You might find a "Got milk?" ad in people magazine
People magazine has been a very well known magazine for years now. They would most likely have a "Got milk?" ad in the magazine because it's so well known and it attracts an adult audience. It's important to attract the adult audiences because they will most likely take action and give kids milk to prevent problems later in life.