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The least-cost diet problem introduces students to optimization and linearprogramming, using the health consequences of food choice. We provide agraphical example, Excel workbook and Word template using actual data on itemprices, food composition and nutrient requirements for a brief exercise inwhich students guess at and then solve for nutrient adequacy at lowest cost,before comparing modeled diets to actual consumption which has varying degreesof nutrient adequacy. The graphical example is a 'three sisters' diet of corn,beans and squash, and the full multidimensional model is compared to currentfood consumption in Ethiopia. This updated Stigler diet shows how costminimization relates to utility maximization, and links to ongoing research andpolicy debates about the affordability of healthy diets worldwide.

Least-cost diets to teach optimization and consumer behavior, with applications to health equity, poverty measurement and international development