"Eating at this establishment more than once will likely lead to coronary artery disease, stoke, cancer, malnutrition.....etc. etc. etc.
The fact that excess weight is correlated to various illnesses as posted elsewhere on this thread;
The high fat, high calorie, low nutrient value of most fast foods. Fat and caloric values are available at all fast food restaurants. For example, one Whopper has approximately 800 calories (without the fries or softdrink) which is an absurd amount of the total daily caloric need of an adult, nevermind a child, for one sandwich.
It is impossible to have a nutritionally balanced diet eating regularly at fast food restaurants and will, in fact, result in a high fat, high calorie diet. Since it is a well established fact that excess calories are what cause an increase in weight and fast food restaurants are excessively high in fat calories......hopefully you get the point.