The health behaviour of young children is largely influenced by parents. While promoting healthy eating and activity at school is probably helpful, it’s not enough.

A conclusion of "probably helpful" is not strong enough to spend public education dollars on, at the expense of other academic instruction (there are a fixed number of minutes in a school day, and if you're not teaching healthy eating you can be teaching something else).

Not to mention that what was taught for the past few decades (lots of grains and cereals and no fat) was flat-out wrong and probably contributed a lot to the obesity problems we have today.