Let's fool ourselves?
For one study, two groups of subjects tasted a so-called new granola. They were asked how much they think the product costs. If the product had a high health score on the packaging, the price was also estimated to be higher.
Do you want to fill your shopping cart with healthy products while shopping? Don't be fooled by the price, because that says nothing about how healthy a product is. More expensive does not necessarily mean healthier. Use common sense and read labels.