Poster Theater Flash Session
Energy and Macronutrient Metabolism
Objectives : The Dietary Guidelines for Americans 2015-2020 indicate that potassium, choline, magnesium, calcium, vitamins A, D, E, and C are underconsumed (i.e., shortfall) micronutrients. Intakes of specific performance-related micronutrients (i.e., calcium, magnesium, folate, choline, iron, zinc, and vitamins A, D, E, B1, B2, B3, and B12), may also be a concern, as suboptimal intakes may limit adaptations to unaccustomed physical training, such as initial military training (IMT). Protein-containing foods are nutrient-dense; therefore, dietary protein intake may alter the amount of shortfall and performance-related micronutrients habitually consumed. This study explored associations between dietary protein (PRO) intake and shortfall or performance-related micronutrient intakes at IMT accession.
Methods : A 3-month food frequency questionnaire was used to estimate habitual dietary intake in male (n=276, age: Mean (SD), 21.1 (3.8)) and female (n=254, age: 21.2 (3.7)) recruits. Multivariate-adjusted MANCOVA and ANCOVA models were used to identify associations between quartiles of PRO intake and shortfall micronutrients or performance-related micronutrients. Models were adjusted for age, sex, ethnicity, race, physical activity, energy density, and total energy intake.
Results : Mean (SE) energy-adjusted PRO intakes were 29.3 (3.2), 36.0 (1.4), 40.8 (1.3), and 47.7 (3.9) g/1000 kcal for quartiles 1-4, respectively. Composite shortfall micronutrient intake differed (p < 0.001) by PRO quartile, as intake of each micronutrient, except vitamin C, progressively increased (all, p < 0.05) with increasing PRO quartiles. Similarly, composite (p < 0.001), and most individual (all, p < 0.05) performance-related micronutrient intakes, except calcium, were different across PRO quartiles. Calcium intake only differed for PRO quartile 1 and was lower than all other quartiles (p< 0.00).
Conclusions : These cross-sectional data suggest that habitually consuming more protein is associated with greater intakes of shortfall and performance-related micronutrients in young healthy adults entering the military.
Funding Sources :
Supported by US Army Medical Research and Materiel Command; authors’ views not official US Army or DoD policy.