The effect of HIV on the nutrient composition of breast milk

Abstract

Thirty-one years after the discovery and isolation of the human immunodeficiency virus (HIV) by French and American scientists, much progress has been made in basic research, clinical treatment, and public heath prevention. Although, much evidence of mother-to-child-transmission (MTCT) of HIV has been amassed since then, not much of it describes the effects of HIV on the nutrient composition of breast milk.

The aim of this study was to determine the effects of HIV on the nutrient composition of breast milk, by studying two groups of adult lactating respondents from the same socio-economic background, who were chosen randomly and participated voluntarily. The study population consisted of 60 breastfeeding mothers, divided into two groups of 30 mothers each. Group one represented the control group of HIV non-infected mothers whereas group two consisted of HIV-infected mothers who did not receive any treatment.

After a registered medical nurse took blood and breast milk samples, analysis was done on ethylenediamine tetra-acetic acid (EDTA) whole blood to determine the haematological and immunological parameters and breast milk was analyzed for nutrient composition. Standard laboratory operating procedures (SOP) were followed, throughout, to determine the parameters of the blood and breast milk samples.

Results showed that associations between the socio-economic statuses (SES) of the two respondent groups could be established. Albeit differences were not significant, some were, however, detected in the number of people contributing to the household income of the respondents (p = 0.0051), their employment status (p < 0.0001) and the availability of water sources (p = 0.1124). It is believed that factors, such as the prevalence of HIV, if related to the different levels of SES may play an important role in the outcome of the health statuses of individuals at different levels of society. By implication, it is not the different levels of SES, but rather factors related to the different levels of SES that have an impact.

Significant differences could be seen in the haematological variables between the two respondent groups: Red blood cell count (RBC) (p < 0.0001), hemoglobin (Hb) levels (p = 0.0119), hematocrit (Hct) (p = 0.0031), mean corpuscular volume (MCV) (p = 0.0005), mean corpuscular hemoglobin (MCH) (p = 0.0043) and monocyte count (p = 0.0275). These differences, however, were not significant to this study.

Other differences that were significant were immunological parameters between the two respondent groups: CD4 cell count (p < 0.0001) and viral load, done only on the blood of the HIV-infected respondent group. The CD4 cell count is used as a guideline for the initiation of treatment for HIV-infected persons and is required to accurately assess the immune status of any patient at any given time. The viral load has long been established as a strong predictor of the rate of disease progression.

The only significant difference in the breast milk composition was reflected in the following variables between the two groups: percentage (%) proteins (p < 0.0001) and calcium levels (p = 0.0081). The median and mean values of the percentage proteins were elevated in the subject group of mothers living with HIV, while calcium levels in the same group showed a decrease in both median and mean values.

The lack of significant differences between the groups might be due to the small study population. If nothing else, this study highlights the need for further trials to evaluate the true effects of HIV on the nutrient composition of breast milk.