This paper addresses an on-going controversy in the nutrition literature over the size and significance of the nutrient elasticity with respect to food expenditure. Linear programming methods are used to estimate the least-cost diets for infants in Cebu, Philippines. The results imply that, overall, the actual expenditure is greater than the least-cost expenditure. Data and regression analyses are used to explore the determinants of the deviations from the least-costs diets. The results support the hypotheses that the deviations increase with income due to the diminishing marginal utility of nutrients and that the deviations fall as the nutritional knowledge of the mother increases.
