Urine Stable Isotope Ratios Are Associated with Proportional Intakes of Animal Protein and Added Sugars in a 15-Day Controlled Feeding Study.

ABSTRACT:

Background

Carbon and nitrogen isotope ratios (CIR and NIR) of blood and hair have shown promise as candidate dietary biomarkers, particularly for sources of dietary protein and sugars. However, whether urine CIR and NIR can provide similar dietary information has not been assessed in United States populations.

Objectives

This was an exploratory analysis that aimed to evaluate the urine CIR and NIR as biomarkers of dietary animal protein ratio (APR; animal protein/total protein) and added sugars ratio (ASR; added sugars/total sugars). We also explored associations with foods contributing to those patterns.

Methods

One-hundred adults [55% females, median age 39 (interquartile range 30-53)] from the Phoenix metropolitan area participated in a 15-d controlled feeding stu

SUBMITTER: O'Brien DM 

PROVIDER: S-EPMC12443068 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature