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Background: The only treatment for celiac disease is the gluten-free diet. Few studies have assessed the nutritional adequacy of this diet, especially of B vitamins related to homocysteine metabolism. The aim of this study was to assess the nutritional status and serum concentrations of B vitamins involved in homocysteine metabolism, and to determine whether the dietary intake of these vitamins are meeting Dietary Reference Intakes in celiac patients.Methods: A cross-sectional study enrolled a total of 20 celiac patients (36.3 ± 13.7 years old; 65% women), following strict gluten-free diet (GFD) and 39 healthy controls matched by sex and age. The dietary intake was assessed by 3-day food records, and serum concentrations of homocysteine and vitamins B6, B12, and folate were determined after overnight fasting. Comparisons between the two groups were performed by Student's t test or Mann-Whitney U-test, for continuous variables. Pearson's chi-square test or Fisher's exact test was used for categorical variables. An alpha level of 5% were considered significant.Results: Celiac patients had lower serum folate concentrations (7.7 ± 3.5 ng/mL, P < 0.05) than controls. All celiac patients had folate intake below the Estimated Average Requirement (EAR) (130.8 ± 53.6 μg/d). However, only a small proportion of celiac patients had hyperhomocysteinemia.Conclusions: Celiac patients treated with GFD presented inadequacy of dietary folate intake and low-serum concentrations of folate, suggesting that more attention should be given to the quality of the nutrients offered by the GFD, as it constitutes a lifelong treatment. [ABSTRACT FROM AUTHOR]