The thing is that the young people who eat "whatever they want" often pay for it when they get older as well. Healthy eating is an investment in the future. If a person eats all kinds of refined foods, fatty meats, alcohol,sodas. fast food, etc, they should not be at all surprised to have more illnesses and disease as they age. Most diseases are lifestyle diseases. Some disease like gallstones,diabetes, certain cancers, arterial sclerosis and the extent of arthritis (gout and osteoarthritis) are hugely influenced by diet. If you look at the reasons people are admitted to the hospital, a great deal of admissions are indirectly related to the person's dietary habits, and the morbidity and mortality of these admissions go up with a person's weight as well. (Fat does not suture well, obese people have higher complication rates of strokes, clots, pulmonary emboli, infection, pneumonia,and bed sores due to their weight )