Short-term oral liquid ingestion decreases human milk osmolality

• MJ. Soto Méndez ^[3] ; A. Maldonado ^[3] ; R. Bright ^[1] ; A. Gil ^[2] ; NW. Solomons ^[3]
  1. [1] Tufts University

     Tufts University

     City of Medford, Estados Unidos

     
  2. [2] Universidad de Granada

     Universidad de Granada

     Granada, España

     
  3. [3] CeSSIAM, Guatemala

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• Localización: Nutrición hospitalaria: Órgano oficial de la Sociedad Española de Nutrición Clínica y Metabolismo (SENPE), ISSN-e 1699-5198, ISSN 0212-1611, Vol. 32, Nº. Extra 2 (Diciembre 2015), 2015 (Ejemplar dedicado a: II INTERNATIONAL AND IV SPANISH HYDRATION CONGRESS), pág. 49
• Idioma: inglés
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• Resumen

  • Introduction: previous studies have reported stability of human milk osmolality in situations of liquid restriction and a decrease in cow milk osmolality in conditions of controlled water ingestion.

    Objective: To confirm any possible influence of shortterm water ingestion and restriction in human milk osmolality.

    Method: 26 mothers of breastfed infants aged 3-6 months were invited to come twice and stay for 90-min in an educational meeting with nutritionists from CeSSIAM. Treatment-1 (tx-1) consisted in consuming 1l of water over 90-min; treatment-2 (tx-2) consisted in being abstained from fluid intake for 90-min. Breastmilk and urine samples were obtained before and after each treatment and measured to determine volume; subsequently, two aliquots were stored at -20oc prior to analysis. Urinary (Uosm) and milk (Mosm) osmolality were measured in a Voguel Löser 815 osmometer. Statistical analyses were performed in SPSS version 20.

    Results: Maternal mean age was 24 y, 42% of the babies were girls. Median baseline and final (90-min) Uosm for Tx-1 were 628 and 248 mOsm/kg (p<0.001), corresponding values for Mosm, 284 and 276 mOsm/kg (p<0.001). Median baseline and 90-min Uosm for Tx-2 were 632 and 655 mOsm/kg (p=0.320), corresponding values for Mosm, 282 and 280 mOsm/kg (p=0.325). There was significant different in the change of Mosm (p=0.013) as well as in the change of Uosm (p<0.001) between treatments.

    Conclusions: We found asymmetrical change in breast milk osmolality after water consumption and water restriction; while fluid restriction does not influence Mosm and Uosm, liquid ingestion impacts human milk and urine by decreasing osmolality.