What your kid weighs is none of your school district’s business, PERIOD!
And if the school district has a problem with this, then vote out all of the school board, and fire all of the teachers and administrators.
If the voters in that municipality won’t or refuse to do that, then they deserve to suffer under the tyrants that they keep supporting.
Getting involved in your children's public schools takes time and effort. Much easier to piss and moan about "government-run indoctrination centers" on internet forums.
Here's a little secret: The schools would love it if more parents got involved.
Home school or private school
If you think that socialized medicine is bad (it is awful), why do you expect any better from socialist education? For that matter, why does *any* conservative or Christian support government funded/controlled education?
Kids are fat today. So is half the population. Thank the government food pyramid, and the sugar industry.