The objective was to identify the cost of meeting the Brazilian National Dietary Guidelines and analyze the impact on family budget. Data from the Brazilian Household Budget Survey for 2008 were used. Food purchases were recorded for seven days in 55,970 households. A subset of low-income families (≤ BRL 415.00 per capita/month and ≤ US$ 1.00 per capita/day) was used for the analysis. We estimated per capita calorie availability, total food expenditures, and food prices aggregated in 8 food groups based on the Brazilian Guidelines. Each food group's share in total calories was estimated and compared to the recommendations. Actual purchases exceeded the recommendations for beans, oils/fats, sweets, and meat/eggs, and fell short for fruits, vegetables, dairy products, and grains. Meeting the recommendations would increase food expenditures by 58% among individuals with per capita income ≤ US$ 1.00/day and by 39% for those with per capita income ≤ BRL 415.00. Adoption of the recommendations would require 145% of total income. Meeting current recommendations would demand an increase in income or a policy to reduce food prices.