Why not mandate that 3 meals a week have at least X g of protein and Y g of fiber?
This seems like the most sensible option. I'm sure the guidelines seemed reasonable when they were first drawn up, presumably to stop cults and shysters feeding the kids inappropriate food but if turkey twizzlers met the meat requirement then the guidelines weren't really doing their job.
So they need guidelines on the amounts of protein, fibre, and calcium, as well as a restriction on UPFs.
Ofsted inspections now check what food is being offered, so it would be easy enough to ensure children are getting a healthy, balanced diet without being so proscriptive as to the sources of the nutrition.
They have to serve it, not force it down student's throats though right? Is there anything restricting them from also serving something plant based at the same time?
I've heard of this, but I'm not sure it's true, after searching I can't find a source that says it is either, are you aware of any studies that suggest this is true?
I'm not advocating removing meat from school meals either, just that everyone is catered for.
In general people can switch between meat and nonmeat diets -but the relevant gut microbiota are different and I don't know if children would know enough to ease into meat-eating again as needed, or to realize that that's what's going on when their tummy hurts