What's the problem? The living things in soil — the worms, insects, bacteria and fungi — help make minerals accessible to the plants growing in that soil. If the soil isn't healthy because of chemical fertilizers, pesticides, fungicides, etc., then the plants can't absorb as many minerals, so you don't get them in your diet.
Soil health is important for many reasons. When you buy organically grown food and holistically grazed grassfed meat, you are directly financially supporting the growth of healthy soil, and you will benefit personally because your food will be more nutritious.