[pascalxus]

Go into the store and mostly buy only things that cost less than 1$ per lb. Even if you average 1$/lb that would mean you could buy 900 grams per day. Just as an example, if you only bought rolled oats and whole wheat flour (which by the way are excellent sources of protein and fiber, magnesium and potassium - far more healthy than the average person eats), you would get about 3000+ calories from that. Though you'd probably want to mix it up a bit and buy some fruit and veg for a small part of your budget, arriving at close to 2k calories per day. And you'd still be eating more healthily than the vast majority of middle class peoples.

Even here, in the insanely expensive bay area, you can buy Costco spinach for 1.60$ per pound. bannanas 47c/lbs, rolled oats for 0.80$ per pound. etc. There's more examples of foods you can find that are cost effective.

Admittedly, you wouldn't be able to eat at restaurants, ever.