Abstract: A diet planning system and method providing a plurality of sets of cards, the cards of each set having a common code, preferably a color code. Within each set there are a plurality of cards for each meal. By selecting on a given day a give color coded set, and substituting freely to select any card within a meal group, the dieter will be provided with information for complete meals on that day which satisfy the dieter's macronutrient and micronutrient goals at a plurality of different calorie intake levels. The different sets can provide variety or be provided for a special purpose, such as special days, i.e., weekend days, special diets, or special dieters, such as for children or teenagers.