Abstract: The present invention provides a single score (or point value) that can be derived for each foodstuff from the glycemic score (or estimate) and/or the insulin score (or estimate) for the foodstuff combined with one or more macronutrient variables for the foodstuff. This single score, which encompasses many qualities of a foodstuff is called the Smart Score. The Smart Score is useful, for example, because it provides a marker for the relative healthfulness of each foodstuff. The present invention also provides that foodstuffs can be ranked according to the Smart Score for each foodstuff, thereby creating an index. This index is called the Smart Index. The Smart Index is useful, for example, for knowing how one foodstuff compares to another in terms of health benefit or adversity.