A spokesman for the Children's Food Trust said evidence shows that schools are offering healthier meals and children are eating more nutritious lunches since national school food standards were put in place.
The average meal is lower in fat, sugar and salt, more children are having water to drink instead of sugary drinks and the amount of fruit and veg on pupils' plates has gone up.
There's still a long way to go but the level playing field created by the standards has been key - and our studies show that when children eat a healthier lunch, they do better in the afternoons.
More top news
The correspondence was released on Tuesday following a lengthy legal battle.
Stone was convicted as part of special counsel Robert Mueller’s Russia investigation.
The removal of Gough Whitlam in 1975 marks one of the most controversial moments in Australia’s political history.