BackgroundFuzzy logic, a mathematical approach, defines the percentage of desirability for recommended amount of food groups and describes the range of intakes, from deficiency to excess.ObjectivesThe purpose of this research was to find the best fuzzy dietary pattern that constraints energy and nutrients by the iterative algorithm.Materials and MethodsAn index is derived that reflects how closely the diet of an individual meets all the nutrient requirements set by the dietary reference intake. Fuzzy pyramid pattern was applied for the energy levels from 1000 to 4000 Kcal which estimated the range of recommended servings for seven food groups including fruits, vegetables, grains, meats, milk, oils, fat and added sugar.ResultsThe optimum (lower attention – upper attention) recommended servings per day for fruits, vegetables, grain, meat, dairy, and oils of the 2000 kcal diet were 4.06 (3.75-4.25), 6.69 (6.25-7.00), 5.69 (5.75-6.25), 4.94 (4.5-5.2), 2.75(2.50-3.00), and 2.56 (2.5-2.75), respectively. The fuzzy pattern met most recommended nutrient intake levels except for potassium and vitamin E, which were estimated at 98% and 69% of the dietary reference intake, respectively.ConclusionsUsing fuzzy logic provides an elegant mathematical solution for finding the optimum point of food groups in dietary pattern.

Background:Leemoo is a user-friendly software designed for nutritional planning and dietary assessment applications by cooperation of Research Institute for Endocrine Sciences of Shahid Beheshti University of Medical Sciences, which uses fuzzy logic for the first time. It provides a range of recommended servings for food groups, which are easier for people to follow.Objectives:The aim of this research was to describe the applications of this newly introduced software.Methods and Materials:Leemoo contains the following databases: food, nutrients, MyPyramid equivalents and physical activity. These databases facilitate diet analysis and planning. The food composition database includes 2920 Iranian food items, with the nutrient composition for up to 64 nutrients.Results:All databases are flexible for updating. The program can calculate the amounts of nutrients and food group intakes and compare these with Dietary Reference Intakes and MyPyramid recommendations. This software has the ability of nutritional planning and estimates normal intake ranges of seven food groups based on person need.Conclusions:This software was envisaged for use by health professionals, researchers and ordinary people and can be recommended for educational purpose and nutrition research in Iran. Future studies must be conducted to evaluate the effects of this software on users’ dietary habits and nutrition knowledge.