How do I persuade my girl to choose healthier food options during recess?

There is indeed more flavour in unhealthy food, but it's very heavy and the natural taste of the food is often masked. Start by introducing healthy food at home in creative ways with minimal seasoning. Once you have been eating clean for a while, you'll realise that a lot of food sold outside is extremely salty. Our children's taste buds are even more sensitive than ours. It's quite hard to persuade people to do something if they don't actually want to do it themselves already.