Why is junk food called junk food? Because it dumps junk into your body. Food that has poor nutritional value is considered unhealthy and is called as junk food. It is food that satisfies the taste buds but has no nutritive value. SAY NO TO JUNK FOOD is a popular slogan one can use to voice ones negative opinion on the creation of consumerism for junk food. Not only junk food adds up to the cause of obesity in young children but also makes one lethargic and low on energy levels. Do you find it hard to resist fast food?