Martha Payne, whose blog NeverSeconds was a global hit, made the comments in Malawi.
Her blog, whose supporters include celebrity chef Jamie Oliver, has raised more than £115,000 to fund a kitchen in Malawi and meals for 10,000 children.
The blog was banned for a while by Argyll and Bute Council due to the publicity it generated about the quality of meals at her school, Lochgilphead Primary.
The council said the blog misrepresented the options and choices available to pupils as it did not cover everything on offer.
However, the council's response failed to take account of the fact the point of the blog was to record the meal Martha had chosen every day. Many of her ratings were also positive.
"My teachers ask children in class a lot about what we think and we tell them. That's all I did on my blog," she said.
"You've got to have opinions or you end up not thinking. The last meal on my blog got 10 out of 10 and then the council banned me because of a newspaper headline.
"I was very upset because you only ban things that are bad and my blog wasn't bad. I think the photos from Malawi will embarrass people like my photos of my school dinners did.
"If you feel embarrassed you shouldn't get angry like the council but you should try and make it better."
Martha has written a book explaining how her blog became a global story.
The book, NeverSeconds: The Incredible Story of Martha Payne and How She Changed The World, will be published by Glasgow firm Cargo. She had help from her father David Payne.