For optimal health we need whole food , live food, natural food and good quality food, with an appropriate balance of protein, carbohydrates, fats, water, vitamins and minerals. If we don't get the balance of nutrients we need, we crave. For example, red meat has lots of protein, fat, water, and some vitamins and minerals but no carbohydrates. So when we eat red meat, we crave sugar, which is pure carbohydrates. Others have said it is much higher than that.
Food is a primary part of all of our lives.
When we reach 80, we will have spent 116,480 hours eating. What we put in our bodies better be the best. They provide the basic nutrients in natural proportions to each other. And yet a hundred or so years ago, it was found that the flour could be whiter, fluffier and store longer if the bran and germ were taken off the wheat.