Healthy food is expensive.
When people are struggling with food choices, ask if they can afford good food. If they can't, then is there something you or the church can do about it?
Yes & No.
A big part of the problem is the perception of "what is healthy" with regards to food largely relies on fads that don't have a strong scientific backing, and the ramblings of social media personalities like "Dr." Josh Axe.
Many don't realize that when those packages boast things like "Non-GMO" or "Certified Organic", the only thing (in most cases) that ads to the food is an additional 60% onto the price with no real, demonstrable health benefits.
...and when it comes to animal foods, that should be the first thing to go if someone's really on a tight food budget. You don't really need it for health (disclaimer: I'm not a vegan, just providing information), and it's subject to the largest amount of price gouging with regards to those fancy labels they put on to give the impression of added health benefits. Things like "free range", "vegetarian fed", "organic", "grass fed", "cage free", etc... all at a lot of additional price, with not a whole lot of additional benefit. There research is split with regards to antibiotic/hormone free red meat & milk with regards to whether or not that actually has benefits, some research says yes, others say the difference negligible (if any).
I was curious, so I did sort of a compare & contrast between shopping for a mostly plant-based weekly stock up from a regular grocery store, and a weekly stock up from the "organic health food store" with a 60/40 plant/animal split.
The former, I was able to get enough food for the week for around $70
The latter, I spent close to $150
...and I take in more calories than most simply due to my exercise & running routines.
If a person wanted to eat healthy, cheaply, it can certainly be done with a little educating.