Article Type : Research Article
Authors : Agarwal KN, Agarwal DK, Upadhyay SK and Agarwal S
Keywords : Under nutrition; Intrauterine; Childhood; Growth; Intelligence; Stunted-Wasted; MR spectroscopy; EEG; Soft neurological signs; Reaction time; Brain MRI; Anemia; Neurotransmitters
Babies born of rural undernourished mothers, showed inter
and intra hemispheric asymmetry and abnormal paroxysmal discharges, suggesting
dysmaturity of brain. The under nutrition, in early life showed impaired growth
as well as the conceptual and sensory development. Primary school children (6-8
years) developed impaired intelligence particularly for performance tasks. The
stunted wasted children showed persistence of ‘Soft Neurological Signs’ with
EEG changes. Those with I.Q. >90 had learning disabilities. Nutrition
supplement for 2 years, in 6-8-year rural children made partial improvement,
only. These children in school age (adolescence) had : a) to mobilize muscle
amino acids to maintain their body functions, b) persistence of soft
neurological signs, c) deficit in higher mental abilities , d) prolonged
reaction time and e) brain MRI showed that both the frontal lobes reduced in
size with loss of asymmetry. Anemia affected placenta, fetus, and brain
functions with irreversible changes in neurotransmitters.
For
understanding the importance of nutrition in pregnancy, it is useful to note
the experience, of world war II from Leningrad (USSR) famine period 16 months,
suggesting that pre-pregnancy under nutrition when faced with acute
malnutrition in pregnancy- results in fall of :birth weight by 530 gm; exposure
in second trimester - 50% born with birth weight <2500 gm. In contrast,
Dutch famine was imposed on a previously well-nourished mothers, it reduced
birth weight by 327gm, and corresponding figure for those with weight
<2500gm was 9%, only. The official daily food for the general adult
population gradually decreased from 1800 calories in December 1943 to 1400
calories in October 1944 to below 1000 calories in the late November 1944.
December 1944 to April 1945 was the peak of the famine during which the
official daily ration fell abruptly to about 400-800 calories. Even though
pregnant and lactating women had extra food during the famine, these extra
supplies could no longer be provided at the height of the famine. What is
unique about Dutch Famine is that it was imposed on a previously well-nourished
population. These two historical examples illustrate the importance of
pre-pregnancy nutrition and its impact on pregnancy outcome [1]. Optimal
nutrition is necessary for brain growth during 20 weeks of intrauterine life to
20 months of age. The endemic under/malnutrition (intrauterine and in early
childhood) affected physical growth and development, making these children
unfit for precision work in later life. Studies conducted in the Department of
Pediatrics, Institute Medical Sciences, Varanasi, India, showed gravity of
maternal under nutrition and its effects on feto-placental axis [2-3].
Pregnancy in undernourished rural women was associated with high pregnancy
wastage; poor weight gain; reduced birth weight which improved on nutrition
supplementation. These undernourished mothers were spending considerable amount
of energy in hard physical workload leading to reduced birth weight and length.
The fetal weight gain in last weeks of pregnancy was as low as 15-53 g / week,
simulating situation of famine [4-7]. It seems Integrated Child Development
Services, in INDIA (on pattern of WISC, USA), in last 4 decades have failed to
address maternal and child malnutrition.
A
prospective study was conducted in the rural settings of Varanasi in the
eastern Uttar Pradesh, to study the effects of maternal nutrition on pregnancy
outcome, and growth and development of their offspring’s. Study evaluated the birth
weight pattern in chronic as well as currently undernourished pregnant women.
Anthropometry, hemoglobin, dietary intake, birth weight, fundal height, and
abdominal girth data of 3700 eligible pregnant women at 16 ± 2, 28 ± 2 and 36 ±
2 weeks of gestation were recorded. Outcome measure was birth weight pattern of
newborns.
Out
of 3700 births, 34.6% were of low birth weight and only 8.2% weighed more than
3000 g. Fundal height was <24.5 cm at 28 weeks of gestation (1368 women) and
was associated with higher low-birth-weight deliveries. It did not increase
during 35-39 weeks of gestation (was lower by 5 cm as compared to normal).With
respect to the maternal weight gain, women in later pregnancy (during 35-43
weeks of gestation) showed weekly weight gain of 15-53 g. In contrast, healthy
women gained 400 g/week in the second and third trimesters. Total weight gained
during the entire period of pregnancy was about 6 kg, only, whereas ideally the
gain should be between 13-15 kg [4].
The
intrauterine growth retarded offspring of undernourished mothers showed
hypotonia in 72% and hypo excitability in 56%. There was modification of
responses in several reflexes e.g. limp posture, poor recoil of limbs,
incomplete Moro’s and crossed extensor responses. Their EEG had shortening of
sleep cycle (REM and NERM), the reduction was marked for REM in babies weighing
< 2000g. There was some inter and intra hemispheric asymmetry and abnormal
paroxysmal discharges, suggesting dysmaturity of brain [8,9].
In
the same rural study area (IMR 133/1000 and 26% low birth weight); children
followed from birth to preschool years (13% severe and 50% moderate to mild
malnutrition) showed that intrauterine and early life under nutrition resulted
in impaired growth and development: intelligence, behavioral, conceptual and
sensory motor development in preschool years of life. Children were assessed on
the Gesell’s developmental schedule from 4 to 52 weeks of age. Children with
grades II and III malnutrition had poor development in all areas of behavior
i.e., motor, adaptive, language and personal social [10,11].
Rural
children studying in primary school between the ages of 6-8 years were assessed
on measures of social maturity (Vineland social maturity scale), visuo-motor
coordination (Bender Gestalt test), and memory (free recall of words, pictures
and objects). Malnutrition was associated with deficits of social competence,
visuo-motor coordination, and memory. Malnourished boys had greater impairment
of immediate memory for words, pictures, and objects, while malnourished girls
had impairment of immediate memory for only pictures. Delayed recall of words
and pictures of malnourished boys was impaired. Malnourished girls had an
impairment of delayed recall of words, only. The same team measured the
intelligence of these malnourished children using WISC (Malin's Indian
adaptation of the Wechsler's intelligence scale for children). IQ scores
decreased with the severity of malnutrition. Significant decreases were
observed in performance IQ, as well as on the subtests of information and digit
span among the verbal subtests. Study has shown that though there is decrease
in full scale IQ, yet performance on all the subtests was not affected. This
suggests that malnutrition may affect different neuropsychological functions to
varying degrees [12].
Stunting
was associated with delay in development of cognitive functions as well as in
permanent cognitive impairments. Rate of development of attention, executive
functions like cognitive flexibility, working memory, visuospatial functions
like visual construction is more severely affected by malnutrition in
childhood, a period that is marked by rapid ongoing development of cognitive
functions [13].
Nutrition
Supplementation-146 children received 450-500 calories with 10-12 gm protein in
rural primary school for 172 days in a year for 2 years. Height gain did not
differ, weight marginally improved. More supplemented children remained in
grade I, in contrast to the control that shifted in grade II malnutrition after
2 years. Supplemented children showed marginal improvement in full scale,
verbal, and performance I Q (WISC). Improvement was significant in all subtests
except for comprehension and Maze tests. The observations on unstructured
Piagetian development task conservation of liquid also improved. The scores of
arithmetic achievement test improved by12-14 points in the supplemented group
[14,15].
The stunted-wasted children demonstrated
presence of soft neurological signs and EEG changes, in form of slow and sharp
waves, particularly in the frontal lobe, but also in parietal and temporal
lobes. The motor deficit was more marked on the contra lateral side of the EEG
changes [16]. Among these undernourished children even those with I Q > 90
showed impaired perceptual maturity and conceptual grasp, suggesting learning
disability [17].
These
undernourished rural children of age 10–12 years demonstrated the following,
when compared to normal nourished children: (i) a relative deficit of memory
quotients assessed by the Wechsler memory scale; (ii) lower scores for
abilities related to personal and current information, orientation, mental
control, logical memory, digit span, visual reproduction and associative
learning; (iii) impaired set formation and flexibility in attention as assessed
by the card sorting test; and (iv) impairment in conditional learning on maze
and conditional associative learning tests. The performance on the finger
dexterity test for fine motor coordination was not affected in undernourished
children [18].
The
follow up studies on these early life undernourished school children until 17.5
years of age showed that they maintained their vital functions by mobilizing
amino acids from body muscles as demonstrated biochemically by increased serum
enzyme activities i.e. LDH, ALP, AST, ALT, CK, CK-MB and CK-mm. 31- phosphorus
magnetic resonance spectroscopy showed that b -ATP and Pi in muscles was significantly increased at the cost of Pcr
(Phosphocreatinine). These changes simulate myopathic status [19]. The Brain
MRI and cognitive evoked potential studies- Frontal lobes- size was reduced and
asymmetry of anterior as well as posterior lobes was less pronounced. P3
latency was normal, but the P2 and P3 amplitudes were higher suggesting neuronal
compensation [20].
Soft
neurological signs observed in preschool years, normally disappear, or reduce
in school years / adolescence. However, early life undernourished (stunted)
children, showed
persistence
of impaired repetitive speed movements with higher degree of overflow and
dysrhythmia. There was deficit in higher mental abilities- related to personal
and current information, orientation, mental control, logical memory, attention
span, visual reproductive and associative learning: impairment in overall
memory function in set formation and conditional learning [21].
Reaction time studies showed effects on
perceptual abilities, information processing and analytical capabilities. It is
important to note that early life undernourished children continued to have
prolonged reaction time, even if they had attained normal nutritional status in
later years [22].
The
fetal brains of rat mothers fed wheat or Bengal gram diets showed: i)
dissociation of brain growth (brain and body growth equally affected) and ii)
fetal and weanling rat neurotransmitters were altered, however, were reversible
to some extent on rehabilitation [23,24].
These
studies raised question about Effects
of maternal anemia (iron deficiency) on feto placental axis
The
prevalence of anemia in the states of Assam, Himachal Pradesh, Madhya Pradesh,
Orissa, Kerala, and Tamil Nadu, during 2002-2003. The study observed that 86.1%
of pregnant women had anemia, with 9.5% of women having Hb< 7.0 g/dl and
81.7% of women lactating up to 3 months had anemia, with 7.3% having Hb<7.0
g/dl [25]. Even the results from 1st phase of the National Family Health Survey
(NFHS-4), 2015-2016, which evaluated maternal and child health and nutrition in
13 states (viz., Andhra Pradesh, Madhya Pradesh, Goa, Bihar, Haryana,
Karnataka, Meghalaya, Tamil Nadu, Sikkim, Telangana, Tripura, Uttarakhand, and
West Bengal) and two union territories (viz. Puducherry and Andaman and Nicobar
Islands)reflected that more than 50% of children in 10 of the 15 states/union
territories and greater than 50% of women in 11 states/union territories are
anemic [26].
Mental
functions in 388 rural anemic primary school children (nutrition controlled)
6-8 yr of age, matched for social and educational status were studied by WISC
and arithmetic test to assess “Intelligence, Attention and Concentration”.
Anemia did not affect intelligence, except subtest-digit span. In Arithmetic
test Attention and Concentration was poor in anemic children [31].
Studies
in children 8-12 years of age having anemia (nutritional, serum ferritin
<20ng) vs (thalassemia, serum ferritin >1000ng), on brain MRI
spectroscopy showed similar iron content in globus pallidus, caudate and
dentate nucleus in both the conditions. There was an increase in creatinine and
aspartate and reduction in choline concentration. Such changes are also observed
in Huntington’s chorea and Alzheimer’s disease. Reduction of choline, in iron
deficiency is a significant effect. Choline is synthesized in the brain in very
small amounts; its uptake is Na+ dependent, which requires oxygen [32].
Latent
Iron deficiency in rat model
Dietary
iron depletion in pregnant rats- reduced fetal hepatic iron and selectively
brain iron content [33]
· Cerebral cortex
17%, Cerebellum 18%, Hypothalamus 19%, Mid
brain 21%, and Corpus striatum 32%, but no change in – medulla oblongata and
pons.
· Fetal brain iron
content did not change after maternal “Fe” supplementation.
· Low brain “Fe”
content was associated with significant alteration in brain Cu, Zn, Ca, Mn, Pb
and Cd levels.
Fetal
Latent Iron Deficiency- brain neurotransmitters showed- irreversible reduction.
Glutamate metabolism- GAD, GDH, GABA-T and their receptors-binding, showed irreversible deficit in both excitatory
and inhibitory pathways of the CNS, TCA-cycle enzymes-mitochondrial NAD+ linked
dehydrogenase, Catecholamine metabolism- Whole brain-dopamine, nor epinephrine,
tyrosine and TAT. Corpus striatum – same as in whole brain, except TAT
increased. 5-HT metabolism- Tryptophan, 5-HT, 5-HIAA. The irreversible neurotransmitter changes were specific to “Fe”
deficiency as in under nutrition, get corrected partially or completely on
rehabilitation.
For a country that the
FAO describes as “the world's largest producer of milk and pulses” and “the second
largest producer of rice, wheat, sugarcane, groundnut, vegetables and fruits”,
it’s a tragic irony to highlight, that not only does India lose close to a
million children under the age of 5 years to malnutrition (primarily) but also
ranks among the lowest on the Global Hunger Index in South Asia (Times Of
India, 16th Oct 2019-World Food Day).
India accounts for the
second highest death rate of children under 5 years due to environmental risks - mainly pollution and poor sanitation
- in the WHO south east Asia region which includes Bangladesh, Indonesia,
and Bhutan. In fact, India fares far worse than China and is among the top 35
countries in the world with highest death rate among under-5 year’s children,
attributable to unhealthy environment. The
health burden of poor water quality is enormous. It is estimated that around
37.7 million Indians are affected by waterborne diseases annually; 1.5 million
children are estimated to die of diarrhea, alone.
Recently, India has
distributed free food to over 6o% population (800 million), tried to provide
water and practice hand washing, sanitizer use in Covid-19 year. Let us see how
much improvement is achieved in nutritional status and reduction in mortalities
(maternal, neonatal and children under 5 yr.).
We are indebted to The
United States Agency for International Development; Indian Council Medical
Research and Nutrition Foundation of India for funds. The Institutional support
was provided by the Institute of Medical Sciences, Varanasi and the SGPGI,
Medical Sciences, Lucknow.