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.
You can get around this. I've personally spent years of my life eating just rice and beans with a bag of frozen vegetables. You can get a really low priced rice cooker ($20-30) that you can spend <1 minute setting up (it'll steam the veggies while it cooks the rice) and then let it run while you're in the shower or doing something else. In the end you get a reasonably health albeit bland meal with less time spent prepping than actually eating. I get why it starts to make sense to just grab a $5 burrito at taco bell as a meal when you're rushing to your second job though.