Here's a calm and well reasoned outlook on vegan diets, courtesy of Marion Nestle. Should assuage any fears about rare instances of malnourished childrens that are being bandied about here. Perhaps a well meaning mod could properly embed it for me:

How Healthy Is Vegetarianism?Really? | Marion Nestle | Big Think

I know this has zig-zagged all over the place, but I thought you were advocating discussion of the UN's ability to be effective advocating the world's diets, not promoting how you would wish to change them.