1] Eat vegetarian (at max lacto-vegetarian for the animal protein required).
2] Eat only what you yourself cook from produce i.e. never eat out, don’t use processed foodstuffs/ingredients unless you know how they were processed and whether that is good/necessary for your health. (You can say this is for religious reasons; let someone try to challenge THAT.)
3] Fast once a week i.e. drink ONLY WATER AND ELECTROLYTES for a 24-hour or 36-hour period, during which you keep your physical activity level the same as all other days (if not more). This calibrates your appetite and informs you of two things: what level of hunger to take seriously and satisfy, and what happens to you if you don’t eat even if you are hungry (almost always, NOTHING).
4] Don’t spend money; have a budget limit for food expenses and stay within that.

Over 10 years ago when I was in Baltimore as a grad student with a funds crunch, I stuck to 2 and 4 rigorously, and back then I was an ovo-lacto-vegetarian and didn’t fast at all. My monthly food expenses were typically $80 (minimum $68, maximum $90).

If you do stick with those four points listed above, then the ‘Matrix’ element still left is the pesticides etc. in the vegetables. For that you’d have to eat only organic foods, and that will push up costs.

But couple what you have just said with the words of Hippocrates “Let food be thy medicine and medicine be thy food.” And it is my conjecture that the modern “matrix food” processing industry is a primary cause for the health problems of the USA.

Add to this the advice of Hippocrates “Walking is man’s best medicine.”
Medicine does not seem to have advanced much since 370 BC; diet & exercise remain the primary mechanisms of health.