Like many dietitians, I often rail against diets. You may hear things like - diets don’t work, skip the fad diet, or simply don’t diet from myself or other like-minded Registered Dietitians. At the same time, however, we may use the word diet in describing a particular way of eating that we feel is sensible or medically necessary. We often endorse a certain way of eating or "diet". To some, this can be confusing.