Reliability and validation of the dietary inflammatory score in children and adolescents: SAYCARE Study

Author(s)

Lívia Gabriele Azevedo Garcia

• Document type: Master's Dissertation
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Faculdade de Medicina (FM/SBD)
• Defense date: 2021-07-28

Examining board members

Heraclito Barbosa de Carvalho; Nelson da Cruz Gouveia; Ariclecio Cunha de Oliveira; Carolina Vieira de Mello Barros Pimentel

• Advisor: Heraclito Barbosa de Carvalho

Abstract

Background: Low-grade chronic inflammation may be associated with developing chronic non-communicable diseases in young populations, often lasting into adulthood. Studies show that the diet is related to chronic inflammation. The Dietary Inflammatory Index is an indicator that measures the inflammatory potential of the diet, with the help of validated tools that assess food consumption. The validation of tools that assess inflammatory dietary patterns in young populations that allow valid and reliable results is essential to guide disease prevention strategies for adulthood. Objectives: This study aimed to estimate the Dietary Inflammatory Index (DII) in children and adolescents in South America, and to test its reliability and validity using an FFQ and an inflammatory biomarker. Methods: This work consists of a validation study in a sample of children and adolescents developed in South America (SAYCARE Study). The usual consumption of foods that contributed to the calculation of the IID was obtained through a FFQ and a 24HDR. Reliability was tested using the FFQ (FFQ1xFFQ2), using the Spearman correlation coefficient to estimate the agreement between measurements. The validity of the DII was tested using a 24HDR and an inflammatory biomarker (CRP) using Spearman correlation and multilevel linear regression. Results: For children and adolescents, the pro and anti-inflammatory food groups showed Spearman\'s correlation coefficient ranging from 0.31 to 0.66, convergent validity ranging from 0.09 to 0.40, and criterion validity for reliability ranging from -0.03 to 0.18. The DII showed Spearman\'s correlation coefficient for reliability ranging from 0.61 to 0.69, convergent validity from 0.16 to 0.23, and criterion validity from -0.03 to 0.24. Conclusion: The DII showed acceptable reliability, weak convergent validity and weak criterion validity in children and adolescents (AU)

• FAPESP's process: 18/19068-8 - Reliability and validation of inflammatory diet index in children and adolescents: SAYCARE Study
• Grantee: Livia Gabriele Azevedo Garcia
• Support Opportunities: Scholarships in Brazil - Master