My teen never eats salads or vegetables. It is not good. There are many nutritional things in these besides vitamins and minerals. There are certain phytochemicals that are very important. Most children will eventually enjoy vegetables and fruits if the parents are persistent.
Most parents give up too quickly.
Keep mealtime a happy place. Children who have a diet of only juice, chips, grapes, raisins and hand crackers often have the worst diets. For the picky eaters, eliminate all those foods for a couple of months. When my daughter eats asparagus, her urine has a very odd odor. This is normal.