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.
There's also the convenience issue. If you work multiple low skill jobs just to make ends meet, you might not have the time to turn fresh produce into a meal. If you're trying to limit yourself to foods that require limited/no preparation and are cheap, you do end up getting a lot of unhealthy options that fill that niche.
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.
From what I saw of American supermarkets and fast food places the various times I've visited (where the healthy stuff in supermarkets was priced like a good restaurant while the fast food was priced cheaper than the nominal cost of my school meals in the UK 15-20 years prior), and how much it differs from British and German equivalents (which do also have junk food, but you can easily eat healthy), I can say for certain that healthy eating doesn't have to be expensive, and when it is expensive that's something that needs to be fixed.
Yes? If unhealthy foods are inexpensive and healthy foods are expensive, taxing unhealthy foods removes some economic pressure to consume unhealthy foods.
