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This work was carried out in order to analyze the Brazilian food diet by estimating the consumer demand system of equations for nutrients and their elasticities, which bring information about the consumer sensibility face to price and income changes. The database used was from Household Expenditure Survey (POF, 2002/03) produced by IBGE (Brazilian Bureau of Statistics). The QUAIDS model was used to estimate the equations for eleven nutrients. The hypothesis of the total income’s non-linearity was not rejected, reaffirming the use of the QUAIDS’ Model. For lipids, cholesterol, protein, vitamins A and B and fibers, the income elasticities showed a decrease as income raises, this behavior indicates the higher consumption of these nutrients in richer households. The carbohydrates did not present much variation as income changes. When it comes to the price effect on the nutrients consumption, the results suggest that the most sensible nutrients were: carbohydrates; calcium; iron; cholesterol; and vitamin C. These nutrients represent most of the basic diet food in Brazil

Estimação das equações de demanda por nutrientes usando o modelo Quadratic Almost Ideal Demand System (QUAIDS)