Validation of a new software eAT24 used to assess dietary intake in the adult Portuguese population

Autores da FMUP

• Milton Severo Barros Da Silva

  Autor

• Carla Maria De Moura Lopes

  Autor

Participantes de fora da FMUP

• Goios, ACL
• Lloyd, AJ
• Magalhaes, VPL
• Torres, DPM

Unidades de investigação

• Ciências da Saúde Pública e Forenses, e Educação Médica

Abstract

Objective: The aim of the current study was to evaluate the accuracy of the new software eAT24 used to assess dietary intake in the National Food, Nutrition and Physical Activity Survey (IAN-AF) against urinary biomarkers: N (nitrogen), K (potassium) and Na (sodium). Design: We conducted a cross-sectional study. Two non-consecutive 24-h dietary recalls (24-HDR) were applied, and a 24-h urine sample was collected. We examined differences between estimates from dietary and urine measures, Pearson correlation coefficients were calculated and the Bland-Altman plots were drawn. Multiple linear regression was used to evaluate the factors associated with the difference between estimates. Setting: Sub-sample from the Portuguese IAN-AF sampling frame. Participants: Ninety-five adults (men and women) aged 18-84 years. Results: The estimated intake calculated using the dietary recall data was lower than that estimated from urinary excretion for the three biomarkers studied (protein 94 center dot 3 v. 100 center dot 4 g/d, K 3212 v. 3416 mg/d and Na 3489 v. 4003 mg/d). Considering 2 d of recall, the deattenuated correlation coefficients were 0 center dot 33, 0 center dot 64 and 0 center dot 26 for protein, K and Na, respectively. For protein, differences between dietary and urinary estimates varied according to BMI (beta = -1 center dot 96, P = 0 center dot 017). The energy intake and 24-h urine volume were significantly associated with the difference between estimates for protein (beta = 0 center dot 03, P < 0 center dot 001 and beta = -0 center dot 02, P = 0 center dot 002, respectively), K (beta = 0 center dot 71, P < 0 center dot 001 and beta = -0 center dot 42, P = 0 center dot 040, respectively) and Na (beta = 1 center dot 55, P < 0 center dot 001 and beta = -0 center dot 81, P = 0 center dot 011, respectively). Conclusions: The new software eAT24 performed well in estimating protein and K intakes, but lesser so in estimating Na intake, using two non-consecutive 24-HDR.

Keywords

• Urinary biomarkers; Nitrogen; Potassium; Sodium; 24-h dietary recall; Validation; Portuguese dietary survey