True that quantity matters but even moreso, it is quality that counts. A child would thrive much better on overeating fruits and vegetables, for example. When I think about a pop tart as a raw material for building a childs body, it sickens me

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Many people are uneducated and totally ignorant about nutrition and blindly feed this crap to their kids for breakfast. Mostly, because their information about these foods comes from magazines as OP mentions or ads on tv. Why give a child a pop tart when an apple or a pomegranate would serve their needs much better?