My understanding is that fresh foods are cheaper than processed/unhealthy foods according to this website:

https://efficiencyiseverything.com/food-nutrition-per-dollar...

I suppose the counter to that is that you could drink oil, but that is a bit unrealistic.

Something to consider is that not all fresh foods are equal. Lettuce is way healthier and cheaper than imported raspberries that need to be basically overnighted to maintain freshness.

Seems like eating healthy is an education problem. Although even as myself, who I consider educated in the manner, I find myself overeating healthy foods out of hedonism and putting on weight.