Maybe just start by spending as little as possible on “interior aisle” supermarket products, and then eat as much red meat as you can afford.
You are making an assumption.
Lettuce, Tomatoes, Cucumbers, Veggies (fresh not frozen), and other fresh food are usually not in the “interior aisles”.
When over half of one’s income goes to the rent and utilities, it becomes difficult to buget the rest.
Just sayin.