Junk foods are high in calories derived from fat or sugar, but it has little dietary fiber, minerals, proteins, and vitamins. The first category of junks I will mention in this answer is sugary drinks. I classify most fruit juices also under sugary drinks because of the high amount of sugar that is present in them. They contain many calories and can cause diabetes and heart disease.
One of the most popular junk food in the world is pizza, and in which some pizza is also very high in calories. Most commercial bread generally is considered as junk. They are low in fiber and some nutrients which can be essential for the body. Some other foods that are considered as junks and which are unhealthy are broiled, fried, and grilled food. Unhealthy chemicals are formed when the cooking process is ongoing, and these chemicals can cause cancer in the body.