Prenatal nutrition addresses nutrient recommendations before and during pregnancy. Nutrition and weight management before and during pregnancy has a profound effect on the development of infants. This is a rather critical time for healthy development since infants rely heavily on maternal stores and nutrients for optimal growth and health outcome later in life. Prenatal nutrition has a strong influence on birth weight and further development of the infant. A study at the National Institution of Health found that babies born from an obese mother have a higher probability to fail tests of fine motor skills which is the movement of small muscles such as the hands and fingers. A common saying that a woman "is eating for two" while pregnant implies that a mother should consume twice as much during pregnancy, but is misleading. Although maternal consumption will directly affect both herself and the growing fetus, overeating excessively will compromise the baby's health as the infant will have to work extra hard to become healthy in the future. Compared with the infant, the mother possesses the least biological risk. Therefore, excessive calories, rather than going to the infant, often get stored as fat in the mother. On the other hand, insufficient consumption will result in lower birth weight. Maintaining a healthy weight during gestation lowers adverse risks on infants such as birth defects, as well as chronic conditions in adulthood such as obesity, diabetes, and cardiovascular disease (CVD). Ideally, the rate of weight gain should be monitored during pregnancy to support the most ideal infant development.
Background
Barker's Hypothesis: the impact of in utero conditions on fetal growth and development The "Barker Hypothesis", or Thrifty phenotype, states that conditions during pregnancy will have long-term effects on adult health. Associated risk of lifelong diseases includes cardiovascular disease, type-2 diabetes, obesity, and hypertension. Babies born lighter in weight appear to have an increased rate of mortality than babies born at a heavier weight. This does not mean that heavy babies are less of a concern. Death rate would rise as birth weight increases beyond normal birth weight range. Therefore, it is important to maintain a healthy gestational weight gain throughout pregnancy for achieving the optimal infant birth weight. When this theory was first proposed, it was not well accepted and was met with much skepticism. The main criticism was that confounding variables—nutrition in early life, the rate of weight gain throughout childhood, and other environmental factors—could attribute to many of the chronic diseases first noted in these low birth-weight populations. Because of this, there was a lack of support for birth weight being recognized as an independent risk factor. Subsequent research studies aimed to adjust for these environmental factors and in turn, provided more convincing results with minimal confounding variables. "Barker's Hypothesis" is also known as "Fetal Programming Hypothesis". The word "programming" illustrates the idea that during critical periods in early fetal development, there are persisting changes in the body structure and function that are caused by environmental stimuli. This relates to the concept of developmental plasticity, which posits that genes are expressed in different ranges of physiological or morphological states as a response to the environmental conditions experienced during fetal development. Programming may be impacted by the mother's diet, and the implications of these changes can persist throughout a child's life. Animal studies show that inadequate maternal nutrition can negatively impact the expression of various genes, the development of tissues and organs, and can be linked to permanent hypertension in offspring. Maternal nutrition extends beyond caloric intake. It encompasses a wide range of elements, like the balance of macronutrients including proteins, carbohydrates, and fatty acids, each having a unique effect on fetal growth. Deficiencies in a mother's diet can send signals to the fetus suggesting that its long-term living conditions will be those of poverty. Consequently, the baby adapts by changing its body size and metabolism to prepare for harsh conditions of food shortages after birth. Physiological and metabolic processes in the body undergo permanent changes as a result of restricted growth. When the living conditions switch from malnutrition to those of abundance, the baby is forced into an environment that works against what its body was designed for. This juxtaposition increases the baby's risk of developing diseases later in adulthood. By the same token, if the fetus growing in the womb of a healthy mother is exposed to prolonged famine after birth, the infant would be less adaptive to the harsh environment than low-birth-weight babies. Additionally, micronutrient deficiencies during pregnancy may influence the long-term outcomes related to survival and cognitive development in offspring. Although these associations are not yet fully established, they underscore the importance of adequate prenatal nutrition during this critical period. The importance of maternal environment as it relates to fetal development has been debated. Studies show that half siblings who share a mother have more similar birth weights than those sharing a father. Other research builds on this, suggesting that over 50% of discrepancies in fetal weight can be attributed to the intrauterine environment, with the second largest contributor being the mother's genes. This research lends support to Barker's hypothesis and highlights the significance of maternal health; however, the mechanisms by which these factors (e.g., malnourishment) influence fetal weight are still under investigation.
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