Back in the day people grew their own food. Colonial America had kitchen gardens next to their homes. Hohokam Indians grew the three sisters - corn, squash, and beans in the hot Sonoran deserts. Today we purchase our food at the store. You can grow some of your own food. You say that is impossible. Kitchen gardens take little space or can be planted in pots and other containers on your patio, backyard, or front porch. You can replace flowers and plants in your yard with herbs, vines, and fruit trees, even in the front yard. Commercial fruits and vegetables are at least a week old before purchased at the store. Replace these with freshly picked one from your yard.
I live in the Sonoran Desert, Valley of the Sun, Phoenix, Arizona area. We all have yards, we love to eat, lots of sunshine, but little rain and high temperatures during the summer months. Even these obstacles can be overcome to grow herbs, fruit, and vegetables. My favorite kitchen garden is the raised bed garden. The beds keep the dogs and children out of the garden, as well as allowing me to not get down on my knees to work in the garden. You can buy kits at home improvement stores or build them yourselves. We built ours and had dirt hauled in. We purchased a composter to dispose of the garden wastes and recycle back for a healthier garden soil.
Benefits of a kitchen garden are plentiful.