junk food is not for good to your body
Junk foods have no or very less nutritional value.
they are not healthy to consume
Most of them are high in saturated fats and sugar components and also excess of salts and lack any fiber. The only reason of their gaining popularity and increased trend of consumption is that they are ready to eat or easy to cook foods.
Also the ease of manufacturing and consumption makes the junk food market spread its influence so rapidly. People, of all age groups are moving towards junk food as it is hassle free and often ready to grab and eat.