Sugar is a form of starch that can lead to obesity and diabetes. Often, we adults consume starch and sugary food excessively. Children who are given packed, factory-manufactured juices, can experience weight gain, hyperactive tendencies (they are not supposed to be in classrooms all day anyway), and diabetes. But hair loss? I haven't seen kids hair-loss yet because of sugar-laden food. :-)
I heard that artificial sweeteners are used in these drinks, Coke softdrinks...