So how good is it?

As I was eating my pinto beans, tomatoes, onion, garlic and strawberry, I saw the need to have a little computer I could set my food on and it would give me the exact amount of each vitamin, mineral, protein, fat, and carb. Why hasn't some genius invented that machine? Since I cannot trace the food to it's roots, I can't tell what was in it's soil, therefore, I do not know what I have eaten. Just have to keep taking every vitamin, mineral, etc. and not knowing whether or not I am getting what I need. One of the puzzles of life that needs a solution.