Emerging evidence indicates that the early life nutritional intake of a child is directly linked to their neurocognitive development. It is said that the first 1000 days of life represent the most crucial stage of neurodevelopment as maximum nervous system development occurs in this period. However, the central and peripheral nervous systems continue to develop and change all through life.
Nutrition plays a key role in modulating neurodevelopment. It is known that acute and chronic malnutrition can impair cognitive development and is more likely to lead to low IQ, attention, and behavioural problems.1 Observational studies indicate that chronic malnutrition may cause stunted growth and deficits in cognition and academic achievements in children from the age of 5 to adolescence.2 On the contrary, optimal nutrition can improve cognitive outcomes. A study has found that consuming a protein-rich diet and energy drinks showed higher cognitive scores at age 4-5, better vocabulary at age 11-18, improved reading capabilities and IQ scores at age 22-29 and a 46% increase in their average wages later in life (age 26-42) as compared to children who did not consume such diet.
Behavioural neuroscience, over the years, has proven that
nutrition plays a key role in the development of neurocognition in the early
stages of development. Formation of brain cells, migration, and
differentiation, development of synaptic connectivity, myelination, and
enablement of cells to communicate with one another, are aided by balanced
nutritional intake. The consequences of nutritional deficiency vary depending
upon the specificity and time of deficiency in correspondence to the
neurological developmental processes at the time.3 Experimental
studies between the years 1992 to 2016 that were conducted in developing
countries (48 studies) for 29814 children indicated that childhood nutritional
supplementation could improve children's cognitive function. The study shows
that supplementation with five or more nutrients shows much stronger benefits
compared to single nutrient supplementation. Supplementing with multiple
nutrients is more likely to bridge the gap and prepare the foundation for
subsequent brain development in early childhood. Childhood supplementation with
zinc, calcium, vitamin B6 & B12, and proteins are particularly effective in
improving cognitive outcomes.4
Vitamin B12 is essential for carbohydrate metabolism, membrane structure and
function, and synaptic connectivity and action. Some studies indicate the
deficiency of Vitamin B12 has a detrimental effect on myelination causing brain
atrophy. Mild forms of vitamin B12 deficiency may lead to slower conduction in
auditory and visual systems. This could interfere with social interaction in
the long run, since the acquisition of cognitive skills coincides with the
pattern of central nervous system myelination.5 Similarly, vitamin
B6 deficiency was found to produce lower retention of electrolytes and
decreased threshold of central nervous system activity.6
Iron
The effect of iron deficiency on the neurocognition of children has been
well documented. Iron deficiency causes a serious impact on an infant’s
physiological as well as cognitive health in the later stages of development
like alteration of immune status, adverse effects on morbidity, delayed
behavioural and mental development, and retardation in growth all of which indicate
poor cognitive and motor development.7
Zinc
The 4th most abundant ion in the brain, zinc, is involved in DNA and RNA
synthesis, cellular growth, differentiation and metabolism, healing of wounds,
and the metabolism of vitamin A. Less is known about the effects of deficiency
of zinc on cognitive behaviour although the prevailing studies show that zinc
deficiency in malnourished children hinders optimal growth and increases
susceptibility to infections. Extremely low levels of zinc adversely affect gene
expression, protein synthesis, immunity, and even skeletal growth and
maturation.8
Iodine
Iodine is necessary for the synthesis of thyroid hormones which play a
crucial role in central nervous system development, neurogenesis, neuronal
migration, axon and dendrite growth, synaptogenesis, and myelination. This
articulates the fact that in case of a deficiency of iodine, the cognitive
intelligence of a child will be negatively affected. Also, diseases like
goitre, hypothyroidism, congenital anomalies, and impaired growth were observed
in children suffering from iodine deficiency.9
Optimizing Neurocognitive Functions with Essential Micronutrients
Due to their extensive role in neurocognitive development in infants,
micronutrients should be incorporated into daily diet, to aid in the overall
effective growth and nourishment of the body. Here is a list of the reference
daily intakes (RDI) required for optimal neurocognitive development by the FDA.10
Micronutrients play a crucial
role in the development of neurocognition and intelligence. The role of
micronutrients in disease prevention and optimal well-being of a child is vital
too. Children need to be, therefore, supplemented with all the essential
micronutrients that are necessary for their optimal growth and development.
References:
1. Nyaradi, A. and Li, J., 2013. The role of
nutrition in children's neurocognitive development, from pregnancy through
childhood. Frontiers in Human Neuroscience, 7(97).
2. Prado, E. and Dewey, K., 2014. Nutrition and brain development in early
life. Nutrition Reviews, 72(4), pp.267-284.
3.Black, M., 2008. Effects of vitamin B12 and folate deficiency on brain
development in children. Food and Nutrition Bulletin, 29(2),
pp.S126-S1.13
4. Ip, P., Ho, F., Rao, N., Sun, J., Young, M., Chow, C., Tso, W. and Hon, K.,
2017. Impact of nutritional supplements on cognitive development of children in
developing countries: A meta-analysis. Scientific Reports, 7(1).
5. Smith, A., 2016. Hippocampus as a mediator of the role of vitamin B-12 in
memory. The American Journal of Clinical Nutrition, 103(4), pp.959-960.
6. Spinneker, A. and Sola, R., 2007. Vitamin B6 status, deficiency and its
consequences - an overview. Nutricion Hospitalaria, 22(1), pp.7-24
7. Hermoso, M., Vucic, V., et al., 2011. The Effect of Iron on Cognitive
Development and Function in Infants, Children and Adolescents: A Systematic
Review. Annals of Nutrition and Metabolism, 59(2-4), pp.154-165.
8. Mamun, M. and Ghani, R., 2017. The role of iron and zinc in cognitive
development of children. Asian Journal of Medical and Biological Research,
3(2), pp.145-151.
9. Prado, E. and Dewey, K., 2014. Nutrition and brain development in early
life. Nutrition Reviews, 72(4), pp.267-284.
10. Fda.gov. 2022. [online] Available at: <https://www.fda.gov/media/99069/download>