The students of grade VII D presented a special assembly on junk food and calorory chart of junk food. National Junk Food Day is celebrated every year on July 21. Dedicated to the foods we like to snack on, Today, you can eat junk food for every meal. Popularized in the U.S in the 1950s, junk foods are usually, by definition, high in fats, sugars, salt, and calories. But they are also high in deliciousness! Junk food day is the perfect day to treat yourself.