Other things do, but it still does protect to a certain an extent. It is much harder to tell the poor child from the one who may not have eaten today and might

Other things do, but it still does protect to a certain an extent. It is much harder to tell the poor child from the one who may not have eaten today and might not tomorrow. It is harder to tell the well-off child from the super-rich child, because the status symbols are in reach of both. It's not a perfect fix, but it reduces the gaps.