The best we can do right now is eat whole food. As close to nature as God made it. If it’s in a box don’t bother. Start by getting rid of processed foods you can easily live without. Then start weeding out the ones you’re dependent on. That’s not always the chips and snacks but things like condiments, coffee creamer, extras you add to your food. All the convenience foods. You can do a version of the joy method of decluttering. Hold the item in your hand and ask “is this real food? Was it made in a lab? How many chemicals are in it? How many times has it been processed to get to its current state? Yes you can eat well on a budget.
Can’t afford meat? Buy the best quality eggs you can. You can make lots of things with eggs. An omelet is a great meal any time of the day stuffed with veggies and cheeses. Boiled eggs are great to have around as a protein snack. Just start asking yourself is this really food? I mean how can you say a Cheeto has any nutritional value whatsoever.