Evaluation of a novel food composition database that includes glutamine and other amino acids derived from gene sequencing data.

Abstract:

OBJECTIVES:To determine the content of glutamine in major food proteins. SUBJECTS/METHODS:We used a validated 131-food item food frequency questionnaire (FFQ) to identify the foods that contributed the most to protein intake among 70,356 women in the Nurses' Health Study (NHS, 1984). The content of glutamine and other amino acids in foods was calculated based on protein fractions generated from gene sequencing methods (Swiss Institute of Bioinformatics) and compared with data from conventional (USDA) and modified biochemical (Khun) methods. Pearson correlation coefficients were used to compare the participants' dietary intakes of amino acids by sequencing and USDA methods. RESULTS:The glutamine content varied from 0.01 to to 9.49 g/100 g of food and contributed from 1 to to 33% of total protein for all FFQ foods with protein. When comparing the sequencing and Kuhn's methods, the proportion of glutamine in meat was 4.8 vs 4.4%. Among NHS participants, mean glutamine intake was 6.84 (s.d.=2.19) g/day and correlation coefficients for amino acid between intakes assessed by sequencing and USDA methods ranged from 0.94 to 0.99 for absolute intake, -0.08 to 0.90 after adjusting for 100 g of protein, and 0.88 to 0.99 after adjusting for 1000 kcal. The between-person coefficient of variation of energy-adjusted intake of glutamine was 16%. CONCLUSIONS:These data suggest that (1) glutamine content can be estimated from gene sequencing methods and (2) there is a reasonably wide variation in energy-adjusted glutamine intake, allowing for exploration of glutamine consumption and disease.

journal_name

Eur J Clin Nutr

authors

Lenders CM,Liu S,Wilmore DW,Sampson L,Dougherty LW,Spiegelman D,Willett WC

doi

10.1038/ejcn.2009.110

subject

Has Abstract

pub_date

2009-12-01 00:00:00

pages

1433-9

issue

12

eissn

0954-3007

issn

1476-5640

pii

ejcn2009110

journal_volume

63

pub_type

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