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*
Department of Pediatrics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110029, India and
United Nations Childrens Fund, United Nations Childrens Fund House, New Delhi, 110003, India.
2To whom correspondence should be addressed. E-mail: community.research{at}cih.uib.no
| ABSTRACT |
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KEY WORDS: food supplementation nutritional counseling feeding advice infant feeding infant growth
| INTRODUCTION |
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An important question is whether the generous availability of a ready to use nutritionally adequate complementary food supported by intense encouragement to use it in optimal amounts, started at 4 mo and continued through 12 mo of age, will substantially prevent growth faltering during the latter half of infancy in low socioeconomic settings with concurrent high morbidity rates.
Efficacy trials of food supplementation during infancy improved infant
dietary intakes by 272-1262 kJ/d and infant growth by 0.040.46
SD (5
6
7
8
9
10
11
12)
. The small to moderate
impact observed may be because increased food availability was not
supported with sufficient encouragement to feed the child to achieve
the desired energy intakes. In trials in which this constraint was
removed, the duration of supplementation was only 3 mo, which may have
been too short to have an impact (13)
.
This randomized, controlled trial was conducted to determine the growth impact of two interventions. The first was provision of a precooked complementary food appropriate in quality and to be given daily from 4 to 12 mo of age with encouragement to use in optimal amounts. The second intervention was nutritional counseling alone.
| MATERIALS AND METHODS |
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The study was conducted in South Delhi, the urban slum of Nehru Place.
Most inhabitants are migrants to the city from rural areas in search of
employment. The dwellings, 7000 or so in number, are made of mud,
concrete or a mixture. The majority of the population (90%) obtains
water from public hand pumps, the remainder through taps. Community
toilets for defecation are poorly maintained and people often defecate
in the open. Of families, 90% are nuclear. Most women (80%) and 40%
of men have never been to school. The median family income is 2000
Rupees (United States: $50) per month (1
,2)
. At the
prevailing prices, access to milk, legumes and vegetables is limited.
Childhood malnutrition is common; 17% of children are wasted and 50%
are stunted at 1 y of age. Morbidity rates are exceptionally high
with a diarrheal incidence of 68 episodes/child each year and
pneumonia of 1.6 episodes/child each year (1
,2)
.
Enrollment randomization and interventions.
The study was approved by the All India Institute of Medical Sciences
Ethics Committee. In a household survey of the entire slum, we
identified all pregnancies and infants under 4 mo of age. Four hundred
and eighteen subjects were enrolled as they reached the age of 4 mo if
written informed consent was available. Infants of families likely to
emigrate during the study or with major congenital
malformations were excluded. After a clinical examination, 24-h dietary
recalls and weights and lengths were obtained for all children at
baseline. Children were stratified by weight for height status (
80%
and > 80% of the National Center for Health Statistics median
for that age) and randomly assigned to one of the four study groups.
The food supplementation group received a milk cereal supplement and
mothers were advised to add 50 mL of warm water to the contents of one
food packet at the time of offering it to the child. Individual packets
of 50 g each were prepared by the National Dairy Development Board
at Anand, Gujarat; the energy and nutrient content of the mixture is
shown in Table 1
. The packets were delivered at home during the twice-weekly visits
for morbidity ascertainment. The number of packets advised per day was
2 at 45 mo, 3 at 67 mo, 4 at 89 mo and 5 at 1011 mo of age. At
these advised intakes the children would receive between 1 and 2
recommended daily allowance of micronutrients listed in Table 1
.
Mothers were recommended to continue breastfeeding and to give infants
the usual home foods. At each twice-weekly visit, day-wise
intake of the packet (since the last visit) was ascertained by asking
the mother and the empty and partly used wrappers were collected. The
study supervisor (a physician) visited the food supplementation
children every month, reviewed the use of the supplement, emphasized
the optimal amounts to be fed, fed the child in the mothers presence
and demonstrated that the child could consume the advised amounts if
the mother reported nonacceptability. Caretakers were asked whether
they required supplement for the other siblings and additional packets
were given, if requested.
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The visitation group children had only twice-weekly home visits for assessment of morbidity; no counseling or advice of any type was provided.
The children assigned to the no intervention group were only contacted at 6, 9 and 12 mo of age for anthropometry and dietary recalls as for the other groups; no other visits were made and no advice was given.
Routine immunization was ensured for all children. Children were
encouraged to visit the study clinic when ill and free treatment was
provided according to World Health Organization guidelines
(15)
.
Measurement of outcomes.
Enrolled infants were visited at home at 6, 9 and 12 mo of age for 24-h dietary recalls and weight measurements in duplicate (Seca scale, sensitivity: 10 g) and length in triplicate (infantometers, sensitivity: 0.1 cm).
At the twice-weekly morbidity visits, mothers were queried about cough, fever and diarrhea and the child was examined for respiratory rate (irrespective of cough), lower chest indrawing and signs of dehydration. Dysentery was defined as an episode of diarrhea in which visible blood was reported in stools. In the food supplementation group, supplement intake was also ascertained at these morbidity visits by reported consumption of packets categorized as one-fourth, one-half, three-fourths of packets and so on.
Sample size.
Based on data from an adjacent population (M.K.B., unpublished results), the sample size of 100 per cell was adequate to detect a 20% difference in mean weight or length increment during the 4- to 12-mo period between the food supplementation or nutritional counseling group and the visitation group with 95% confidence and 90% power.
Training, standardization and supervision.
Personnel were trained in anthropometric measurements, morbidity assessment and interview techniques for 3 mo before study initiation. Standardization exercises for inter- and intraobserver variability in weight and length were performed in which each child was measured twice. The study commenced only when all the field workers obtained identical readings in both their weight measurements on a child and were in perfect agreement with the supervisors readings. For length, a difference of up to ± 0.5 cm between the two readings of a field worker and between the readings of the supervisor and a field worker was considered acceptable. Exercises were repeated every 3 mo during the study.
The accuracy of the weighing scales was checked daily against known weights.
Data analysis.
The visitation group was chosen a priori as the control group for comparison with intervention groups to eliminate the unintended effects of repeated household visits.
Analyses of anthropometric outcomes (26, 38 and 52 wk) were restricted to infants with measurements within 30 d of the scheduled date. The 24-h dietary recall data were also restricted to the same infants.
To determine median food supplement intakes at 26, 38 and 52 wk through reported consumption of packets, the amount of supplement consumed by each child over a 4-wk period (± 2 wk at that age) was used to obtain intakes per day.
Effect sizes in terms of SD shifts were calculated as the mean change in weight in the intervention group minus the mean change of the visitation group divided by the pooled SD of change for both groups.
Diarrhea was defined as the passage of three or more liquid stools in a
24-h period; two episodes were separated by at least a 72-h
diarrhea-free interval. Dysentery was defined as three or more
liquid stools in a 24-h period with reported visible blood in any of
the stools. Cough with high respiratory rate (
50/min) or lower chest
indrawing defined an episode of acute lower respiratory infections
(ALRI)3
. Two episodes of ALRI had to be separated by minimum 2-wk interval and
that of fever by 1 wk.
The prevalence was calculated for each infant as the number of days with illness per 100 d of follow-up to obtain an estimate of each groups mean prevalence.
To estimate the mean incidence per group, the incidence of illness was calculated for each infant as the number of episodes of that illness that had occurred in the follow-up period. Prevalence and incidence estimates were restricted to infants available for at least two-thirds of the follow-up period.
Analysis was done using Epi Info, Version 6.0 (CDC Atlanta, USA and WHO
Geneva, Switzerland) and STATA, Version 6.0 software (Stata
Corporation, Texas). Means were compared by analysis of
variance and Students t test was used for individual
group comparison. Kruskal-Wallis H test was used when the data were not
normally distributed.
2 test was used for comparison of
categorical variables. Differences with P < 0.05
were considered significant.
| RESULTS |
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Infants in the food supplementation group gained 250 g [95%
confidence interval (CI): 20480 g] more weight during the study than
did the visitation group. The difference in the mean increment in
length between the food supplementation group and visitation group was
0.4 cm (95% CI: -0.10.9 cm). The proportion of infants wasted at
end study was not different between the food supplementation and
visitation groups; the proportion stunted was reduced in the food
supplementation group by;T3\tT4> 6.8% (95% CI: -6%20%) but
this was not significant (P = 0.16) (Tables 3
and 4
). When compared to the no intervention group, the food supplementation
children gained 100 g more in weight (95% CI: -120320 g) and
0.4 cm (95% CI: -0.070.87 cm) in length during the study (Tables 3
and 4)
.
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There was no significant benefit of nutritional counseling on
weight and length increments compared with either visitation or the no
intervention groups (Tables 3
and 4)
. The nutritional counseling group
gained 90 g (95% CI: -96276) more weight than did the
visitation group during the entire study (Table 3)
.
Impact on energy intakes.
Table 5
shows the median energy intakes from the supplement and from usual
foods based on 24-h dietary recalls at 26, 38 and 52 wk. For the food
supplementation group, the energy intakes derived through reported
intakes at the twice-weekly household visits for morbidity
assessment are also shown as a footnote.
|
Based on 24-h dietary recalls, the median intake of supplement
was similar at 26, 38 and 52 wk. Accordingly, during the study the
infants consumed
66% of the recommended daily allowance for
vitamin A, 26% for vitamin D, 53% for calcium, 50% for iron and 60%
for zinc from the food supplement alone.
Impact on breastfeeding.
The proportion of infants who were breastfed was significantly lower in the food supplementation group compared with the visitation group at 52 wk (difference in proportions: -12.8%; 95% CI: -4 to -21); it was marginally lower at 38 wk (difference in proportions: -5%; 95% CI: -12.3%0.4%). Compared with the visitation group, the mean breastfeeding frequency was significantly lower at 26 wk (difference in means: -1.7; 95% CI: -2.7 to -0.7) and at 38 wk (difference in means: -1.2; 95% CI: -2.34 to -0.06) in the food supplementation group.
Nutritional counseling and visitation groups did not differ in proportion of infants breastfed or in the mean breastfeeding frequencies at 26, 39 and 52 wk of age.
Impact of morbidity.
The food supplementation group had significantly higher prevalence of
fever and dysentery (P < 0.05) compared with the
visitation group. Nutritional counseling did not affect morbidity. The
incidence and prevalence of diarrhea and ALRI were not significantly
affected by either intervention (Table 6
).
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| DISCUSSION |
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Several factors may have limited the growth impact, in spite of the
reported high intakes of supplement. First, it is possible that the
intakes may have been overreported partly as a result of the intense
pressure on mothers to use the supplement and to account for the
packets. The overreporting may have been higher for estimates based on
use of packets at morbidity visits because the intake reported by
mothers was rounded off to the nearest one-fourth of a packet.
Second, although average reported intake improved considerably in the
food group, energy intakes remained short of ideal requirements in a
large proportion. For instance, at 9 mo of age, 42% infants did not
consume the recommended 1881 kJ from nonbreast milk sources
(16)
.
Furthermore, energy intakes did not show the expected increase with progression in age, as was advised to the caretakers. As a result, the shortfall in energy and in nutrient intakes increased progressively until the end of the study. This is reflected in the trends in weight increments during different time intervals. The 250-g additional increment in the food supplementation group observed during the entire study compared with the visitation group occurred almost entirely in the 26- to 38-wk period, corresponding to a SD shift of 0.5. The inability to sustain accelerated growth beyond 38 wk despite availability of appropriate foods indicates that there are barriers related to offering of foods by caretakers or in their consumption by children at the recommended frequency or in desired portion sizes that may have persisted despite the intervention.
Reduction in breastfeeding in the supplemented children seems to
be large enough to have potentially limited the growth impact of the
intervention. Food supplementation interventions were also found to
reduce breast milk intake in several earlier studies (12)
.
In studies in which such information was available, infants consumed
29836 kJ/d less energy from breast milk because of being offered
complementary foods (12)
.
Increased morbidity has usually not been reported in food
supplementation trials or programs (5
6
7
8
9
10
11
12
13
,17)
. In this
trial, the increased morbidity in the food supplementation group
infants may have been due to very high risk of contamination in this
population as is evident from high diarrhea rates in all the groups.
Contamination may have occurred during preparation of the supplement
and while feeding the infant. Although caretakers were instructed to
use boiled water for preparation of the food and to wash hands and
utensils before feeding the infant, the compliance with these was not
monitored. Decreased breastfeeding rates may have partly contributed to
the increased morbidity. Exclusive as well as partial breastfeeding has
been shown to provide significant protection against dysentery
(18
,19)
. Finally, because a physician made additional home
visits to encourage use of the supplement, some of the increased
morbidity may be due to differential overreporting in this group.
Previous studies have shown reduction in consumption of usual foods as
a result of supplementation (12)
. In the current study
when the visitation group was used for comparison, no reduction was
observed in energy intakes from usual foods because of the food
supplementation. The nonbreast milk energy intakes from usual foods
were, however, reduced by 18%36% at 26, 38 and 52 wk in the food
supplementation group compared with the no intervention group and a
possible negative impact of the supplement on usual food intakes,
therefore, cannot be excluded.
Nutritional counseling significantly improved nonbreast milk energy
intakes in comparison to the visitation group and the average increase
ranged from 280 to 752 kJ/d at different measurement points during the
study. This is similar to the findings of earlier studies
(12)
. Although this level of additional intake of energy
and specific nutrients is important, there is a need to devise ways to
make counseling more successful. It is likely that interventions
targeted at the entire community rather than to individual mothers with
effective communication support and community participation may improve
impact by reducing cultural barriers to achieving optimal intakes.
In conclusion, increasing food intakes from 4 to 12 mo of age through food supplementation and encouragement to feed resulted in substantial increase in weight gain between 6 and 9 mo of age with little additional increment in the 16- to 26-wk and 38- to 52-wk periods. To improve the impact of food supplementation, careful attention must be paid to the possible detrimental effect on breastfeeding, intake of usual foods and morbidity. Nutritional counseling resulted in smaller but significant increases in dietary intake without affecting breastfeeding or morbidity. In addition to providing food and nutritional counseling, interventions are required to overcome other barriers to adoption of optimal feeding practices.
| ACKNOWLEDGMENTS |
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| FOOTNOTES |
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3 Abbreviations used: ALRI, acute lower respiratory infections; CI, confidence interval. ![]()
4 For Commentary on this article see: J Nutr. 131: 1879-1880, 2001 ![]()
Manuscript received November 8, 2000. Initial review completed December 12, 2000. Revision accepted April 5, 2001.
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