Many do not think of a diet unless it eliminates carbs or calories or both. Because many believe carbs and calories are both energy sources. But they are not. Calories are a source of energy. Carbs are not. Carbs are macronutrients. And both carbs and calories are necessary for our Sustenance. But most of us could probably do with less of both. Less … not total elimination. Therefore, when we are advised to reduce carbs, we likely only need to drop potato chips, cupcakes, and sugary beverages. We should never drop carbs altogether. Read this link for a short discussion on the difference between carbs and calories.