Clinical Research Directory

Early Life Malnutrition, Environmental Enteric Dysfunction and Microbiome Trajectories

Malnutrition in women of reproductive age remains a public health concern in Sub-Saharan Africa (SSA). Malnutrition during pregnancy affects foetal growth with a tendency of the exposed infants to also develop it. The interaction of the mother with the infant shapes the seeding and the trajectory of the infant intestinal microbiota which is crucial for development of a healthy immune system Malnutrition has been associated with intestinal inflammation, intestinal leakage and reduced calorie absorption. Early life malnutrition and environmental enteric dysfunction (EED) immunopathology remains poorly described in the context of mother-infant dyads. This is essential as malnutrition, poor water, sanitation and hygiene (WASH), including the presence of infectious diseases limit the developmental potential of the exposed infants in SSA, including Zimbabwe. In addition, maternal stress and poor mental health may also affect standard hygiene practices, including how a mother cares for her baby, potentially aggravating EED and the risk of the infant being malnourished. Primary outcomes 1. Infant malnutrition and recovery. 2. Gut dysfunction (gut inflammation, leaky gut, malabsorption, dysbiosis) 3. Diarrhea episodes, defined as any episode of acute diarrhoea (≥3 passages of loose stool within 24 hours as reported by the mother) occurring before the next study visit. Definition of malnutrition outcomes to be assessed in babies born to malnourished women, is a mid- upper arm circumference (MUAC) \<23cm; * MUAC for age: Malnourished defined as those below -2 standard (SD) of the World Health Organisation (WHO) reference * Weight-for-age: Underweight defined as those below -2SD WHO reference * Weight-for-height: Wasted defined as those below -2SD WHO reference * Height-for-age: Stunted defined as those below -2SD WHO reference * Z-scores (as they are i.e. a continuous variable, taking age of infants into account) * A composite variable, any of malnourished, underweight, wasted or stunted.

Microbiome and Malnutrition in Pregnancy

This study is being conducted to investigate how a mother's nutritional status and her gut microbiome during pregnancy contribute to the birth outcomes and health of her baby. The gut microbiome is the totality of microorganisms (e.g. bacteria, viruses, fungi) living in the gastrointestinal tract. This study will focus on pregnant women, 28 years and younger living in the Toronto and greater Toronto area. The focus is on younger women due to their vulnerability to undernutrition. Pregnant participants, and upon delivery, their newborns will be followed throughout pregnancy and for a year afterwards. Throughout this period, the investigators will collect stool samples, rectal swabs, blood samples, health assessments, nutritional and dietary assessments and birth/ labour details. The goal is to define the relationship between a mother's nutritional status and her microbiome dynamics during pregnancy and how they contribute to the birth outcomes and growth of her newborn. With the hypothesis that alterations of the microbiota in the maternal gut (dysbiosis) exacerbated by nutritional status or pathogen exposure during pregnancy, impacts weight gain because of impaired nutrient absorption, leading to corresponding negative birth outcomes.