vegetables are rich of antinutrients that will outbalance the other nutrients you expect them to give you... while milk and yogurt (and kefir) are still by all means animal foods, and nuts can be nice in moderation (useful but still not needed, and I admit I do concede rarely to them) greens are all but a remnant of the indoctrination every person receives from mom and granma when they were a child, and very bad stories were told them about the horrible things that happen to kids who do not eat their vegetables.

The only undeniable truth is that every sane child, if left to his choice, will avoid vegetables altogether, and even without the need to delve deeper into nutritional investigation, that's a big enough hint