Diet plays an important role in the individual's life, Most of the disease might occur in the body due to the improper diet and diet includes the junk and oily food. Some of the disease has no consideration with the diet and occurs due to the genetic related problems.
Among the disease listed in the question, the disease that are related to the intake of the food are : cancer, diabetes, heart disease, kidney diseases
, stroke and Alzheimer's disease. The disease that has no relation with the diet are accidents, self killing, influenza and respiratory disease.
For one teens get addicted mostly through peer-pressure and two the brain becomes confused with whats wrong and whats right once you start and can't quit.