The science of nutrition is, and always has been, a confounding mess. Are carbohydrates good or bad? Do you really need to banish fat from your diet? Can salt actually cause irreparable harm? The answer to these questions changes every few years. Add to this the plethora of diets that keep coming in and going out of fashion every few months, and you're left confused about what really is healthy. However, the one trend that has been consistent is the organic food movement.