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  • Title: No Association between Glucocorticoid Diurnal Rhythm in Breastmilk and Infant Body Composition at 3 Months.
    Author: Hollanders J, Dijkstra LR, van der Voorn B, Kouwenhoven SMP, Toorop AA, van Goudoever JB, Rotteveel J, Finken MJJ.
    Journal: Nutrients; 2019 Oct 02; 11(10):. PubMed ID: 31581748.
    Abstract:
    OBJECTIVE: Glucocorticoids (GCs) in breastmilk have previously been associated with infant body growth and body composition. However, the diurnal rhythm of breastmilk GCs was not taken into account, and we therefore aimed to assess the associations between breastmilk GC rhythmicity at 1 month and growth and body composition at 3 months in infants. METHODS: At 1 month postpartum, breastmilk GCs were collected over a 24-h period and analyzed by LC-MS/MS. Body composition was measured using air-displacement plethysmography at 3 months. Length and weight were collected at 1, 2, and 3 months. RESULTS: In total, 42 healthy mother-infant pairs were included. No associations were found between breastmilk GC rhythmicity (area-under-the-curve increase and ground, maximum, and delta) and infant growth trajectories or body composition (fat and fat free mass index, fat%) at 3 months. CONCLUSIONS: This study did not find an association between breastmilk GC rhythmicity at 1 month and infant's growth or body composition at 3 months. Therefore, this study suggests that previous observations linking breastmilk cortisol to changes in infant weight might be flawed by the lack of serial cortisol measurements and detailed information on body composition.
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