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Nutrient intakes of infants and toddlers from maternal and child care centres in urban areas of China, based on one 24-hour dietary recall
- Cheng Chen1,
- Liya Denney2Email author,
- Yingdong Zheng1,
- Gerard Vinyes-Pares3,
- Kathleen Reidy4,
- Huan Wang1,
- Peiyu Wang1 and
- Yumei Zhang1Email author
Received: 29 April 2015
Accepted: 30 September 2015
Published: 28 October 2015
Abstract
Background
An understanding of the diet of young children from infancy to early childhood in China is limited. The objective of this study is to evaluate nutrient intakes of young children from urban areas in China.
Methods
Mothers, infants and children were recruited from maternal and child care centres as part of a cross-sectional survey of Maternal Infant Nutrition Growth (MING). One 24-h dietary recall was completed for a sample of infants and toddlers aged 6 to 35 months (n = 1409) via face-to-face interviews with the primary caregiver. Nutrient intakes were estimated using data from Chinese Food Composition tables and compared with the Adequate Intakes (AI) or Estimated Average Requirement (EAR) from China.
Results
Mean intakes of most nutrients met or exceeded AIs. Mean fat intakes (% energy) in all subgroups fell below the AIs (32 % vs. 40 % among infants; 31 % and 32 % vs. 35 % among younger and older toddlers). Mean intakes of vitamin B6, folate and selenium were below the AIs among infants (0.3 vs. 0.4 mg/d, 93 vs. 100 μg/d and 15.2 vs. 20 μg/d, respectively). A risk of inadequate iron intake was also observed in infants. Mean vitamin A intake exceeded the recommendations in all subgroups. Mean sodium intakes among toddlers significantly exceeded the AI.
Conclusions
Based on one day dietary intake, the diets of the infants and toddlers appear to be adequate in mean intakes of most nutrients, with a few exceptions including risk of inadequate intakes of fat, vitamin B6, folate, iron and selenium among infants and risk of inadequate intake of fat, vitamin B6 and folate as well as excessive intakes of vitamin A and sodium among toddlers.
Keywords
Background
Appropriate nutrition during infancy and early childhood is vital for optimal growth and development. Dietary patterns established during childhood often persist into adulthood and have implications for developing diet-related chronic diseases later in life [1–3]. Several national nutrition surveys have been conducted in China since 1982. However, in those surveys only the population groups aged 2 years and older were studied [4]. This is also the case for regional and local studies.
Yin, Duan and colleagues studied the diet of young children aged 2 to 7 years from different cities and provinces in China using three day food records. Compared with recommendations, inadequate intakes of calcium, zinc and vitamin C and too much salt intake were found among children aged 3–6 years from urban areas [5] and inadequate intakes of energy, protein, calcium, zinc, thiamine and riboflavin were reported among young children aged 2 to 7 years from rural areas [6]. Only one study was conducted in children aged 1 to 5 years in Yunnan Province, a poor area of China, using the data from three 24-h dietary recalls. Inadequate intakes of protein, carbohydrate, fat, calcium, iron, zinc and vitamin A were identified among the children [7].
Thus, up to now, an understanding of the diet of infants and toddlers is still limited, especially how the diet evolves over this period when children are transitioning from an all milk diet onto family food. In addition, the rapid changes in economic development and demographics in China have resulted in dietary and lifestyle changes [8–11] such as the shift towards a diet higher in fat and meat and lower in carbohydrates and fibre, a rapid increase in obesity and a decline in under-nutrition [8]. The extent to which these changes have affected the food consumption and nutrient intakes of young children in China is unknown.
The objective of the present study was to describe mean nutrient intakes of a sample of young children aged 6 to 35 months from urban areas of China using data from the Maternal Infant Nutrition Growth (MING) study, in which one 24-h dietary recall was collected.
Methods
Subjects
The MING study was a cross-sectional study designed to investigate the dietary and nutritional status of pregnant women, lactating mothers and young children aged from birth up to three years living in urban areas of China conducted in 2011 and 2012. Eight cities were chosen for the MING study according to the geographical location and status of economic development defined as first or second tier cities. The 8 cities included 4 first tier cities: Beijing, Shanghai, Chengdu and Guangzhou and 4 s-tier cities: Shenyang, Lanzhou, Zhengzhou and Suzhou. In each city, two maternal and child care centres (MCCC) were randomly selected. The MCCC is the primary health care facility that provides free birth-related health services to all women and their young children in all regions of China. The care centres are located in local residence communities in different districts of the city for easy access. The main services of MCCCs are to conduct regular heath checks for pregnant women and their babies, and to provide regular vaccinations to young children from birth up to school age. In MCCCs, young children aged 6 to 35 months were randomly selected based on child registration information and their parents or caregivers were approached for subject recruitment. Response rate was 66 %. Exclusion criteria were parents or caregivers with psychopathy or abnormal memory, infants with hereditary disease or disability, as well as infants suffering from respiratory diseases or digestive tract diseases during the investigation. A stratified sample of 1498 young children in three age groups of 6 to 11, 12 to 23 and 24 to 35 months was obtained. Children under 12 months of age are called infants; children 12 to 35 months of age are called toddlers.
The study was conducted according to the guidelines in the Declaration of Helsinki. All of the procedures involving human subjects were approved by the Medical Ethics Research Board of Peking University (No.IRB00001052-11042). Written informed consent was obtained from the primary caregiver of each infant or toddler participating in the study.
Data collection and nutrient database
All information collected from the study was obtained through face-to-face interviews with the parent or caregiver of each child. All interviewers were trained with a standard protocol for conducting the interview. The interview covered the information of a general questionnaire, a single 24-h dietary recall, a food frequency questionnaire, a survey on dietary supplement use and consumption of commercial baby food products.
The general questionnaire provided information on family demographic and socioeconomic characteristics, such as age, birth weight, recent medical history, education and occupation of parents and monthly household income (per capita). Information about feeding practices was also collected through this questionnaire. One 24-h dietary recall was completed for all infants and toddlers. Interviewers asked the primary care-giver about all foods, beverages and supplements that the infant or toddler consumed on the previous day. A picture booklet of common foods consumed in China and measurement aids such as spoons, cups and bowls were used to estimate the amount of foods and beverages consumed. Details about food ingredients of homemade foods or meals eaten out were also asked and recorded. In addition, information on the use of dietary supplements was collected, including the name and brand of the supplement, age when supplement was first given and the amount used. A list of dietary supplements commonly used in China was used to identify the supplements reported during the interview.
All the questionnaires including the 24-h dietary recalls were reviewed by the project supervisors in each of the cities for missing foods and unrealistic quantities reported. When such issues were found, the caregiver was contacted by telephone to verify the information. Of 1498 dietary records, 89 records (6 %) could not be verified were excluded from the final data analysis. Thus, final samples sizes of the subgroups were 444 children 6 to 11 months, 476 children 12 to 23 months and 489 children 24 to 35 months.
Food records were entered and processed with a food composition database created for this study that included data from Chinese Food Composition (CFC) tables 2004 & 2009 [12, 13] and branded-products and supplements from China. CFC contains information of 1773 foods with 36 nutrients. The values for both beta-carotene and retinol were available in the database, thus vitamin A was estimated in retinol activity equivalents using the following formula [14]: Retinol activity equivalents = μg retinol + 1/2 (μg beta-carotene equivalents/6).
In the CFC, the vitamin A concentration for breast milk was 11μgRE/100 g, which is significantly lower than our analysis of the breast milk samples from the MING study, 70 μgRE/100 g (unpublished data). This MING value is in line with the vitamin A concentration of breast milk reported by USDA [15], therefore, this value was used to estimate vitamin A intake from breast milk. In addition, in CFC, vitamin B6 data of breast milk was not available; we also used our analysis for vitamin B6 calculated from breast milk.
Additionally, data on infant products was limited in CFC, therefore, we compiled nutrient information for 78 branded-food products, including baby food and infant formula products using nutrition information from product labels. When a specific food was reported for which there was no nutrition information available, the nutrient data for a similar product was used. Finally we also compiled nutritional information from 75 dietary supplements sold in China.
The amount of breast milk consumed was estimated, using the approach developed by Butte et.al. Data on the amount of human milk fed was not collected, but rather data was collected on the number of times the mother nursed during the day. For infants aged 6 to 11 months fed human milk as the sole milk source, the amount of human milk was assumed to be 600 mL/day; for partially breastfed infants, the amount of human milk was estimated as 600 mL/day minus the amount of formula/other milks consumed. For breastfed toddlers aged 12 to 23 months, the amount of human milk was estimated as 89 mL per feeding occasion; and for toddlers aged 24–36 months, the amount of human milk was estimated as 59 mL per feeding occasion [16].
Analytic methods
All statistical analyses were performed using SAS version 9.2 (SAS Institute, Inc., Cary, NC, USA). Nutrient adequacy was assessed by comparing nutrient intakes to the Recommended Dietary Intake from the Chinese Nutrition Society 2013 [17]. The nutrient intakes, including the nutrients from food, beverages and dietary supplements are reported for each of three age groups: infants, younger toddlers and older toddlers. Since only one day 24-h recall was available for our sample, we were not able to adjust the distribution of nutrient intake to reflect usual intake as can be done with multiple days of dietary intake. Nutrient intake assessments were done by comparing mean intakes with the Adequate Intake (AI). A population group with a mean nutrient intake at or above the AI can be assumed to have nutritionally adequate diets and implies a low prevalence of inadequate intakes [18]. Estimated Average Requirement (EAR) is also presented for reference and discussion. The energy requirements are expressed in terms of estimated energy requirements (EER). The EER is defined as the sum of the energy intake predicted to maintain energy balance for an individual’s age and weight, as well as an allowance for energy deposition to account for growth [19].
Results
Description of the sample and dietary supplement use
Characteristics of the infants and toddlers from the MING study
Characteristics | Percent | Standard error |
|---|---|---|
Child’s sex | ||
Male | 54.6 | 1.4 |
Female | 45.4 | 1.4 |
Child’s Ethnicity | ||
Han | 95.0 | 0.6 |
Non-Han | 5.0 | 0.6 |
Age of mother at birth(y) | ||
< 19 | 0.8 | 0.2 |
20–24 | 22.9 | 1.1 |
25–29 | 44.7 | 1.4 |
30–34 | 22.5 | 1.1 |
35–39 | 7.4 | 0.7 |
≥ 40 | 1.7 | 0.4 |
Mother’s education | ||
Did not attend school | 0.6 | 0.2 |
Primary school | 2.7 | 0.4 |
Middle school | 17.9 | 1.0 |
High school/Secondary specialized school | 22.1 | 1.1 |
Technical College | 22.7 | 1.1 |
Bachelor’s degree | 25.0 | 1.2 |
Master’s degree or above | 9.0 | 0.8 |
Average monthly income (per family member) | ||
< RMB 500 (<USD 80) | 1.1 | 0.2 |
RMB 501–1500 (USD 80–240) | 10.4 | 0.6 |
RMB 1501–2000 (USD 240–320) | 14.3 | 0.7 |
RMB 2001–3000 (USD 320–480) | 20.8 | 0.8 |
RMB 3001–4000 (USD 480–640) | 14.0 | 0.7 |
RMB 4001–6000 (USD 640–960) | 13.8 | 0.7 |
RMB 6001–8000 (USD 960–1280) | 7.6 | 0.5 |
> RMB 8000 (USD 1280) | 11.3 | 0.7 |
Unspecified | 4.4 | 0.4 |
The main caregiver | ||
Mother | 60.4 | 1.3 |
Father | 0.5 | 0.2 |
Grandparent(s) | 36.7 | 1.3 |
Nanny | 1.1 | 0.3 |
Others | 1.3 | 0.3 |
Missing(not reported) | 3.8 | 0.5 |
As reported by the child’s primary caregiver, the percentage of the young children receiving dietary supplements on the day of their 24-h dietary recall was 57 %. The supplements used most frequently were fish liver oil, multiple vitamin and mineral supplements.
Nutrient intakes of infants aged 6 to 11 months
One-day nutrient intakes from food, beverage and supplements of infants aged 6 to 11 months (n = 444)
Nutrient | RNI or AI | EAR | Median | Mean ± SD |
|---|---|---|---|---|
Macronutrients | ||||
Energy (EER, Kcal/d) | 80 | 73 | 79 ± 46 | |
Fat (g/d) | 26 | 25 ± 14 | ||
Carbohydrate (g/d) | 80 (AI) | 85 | 103 ± 74 | |
Protein (g/d) | 20 | 15 | 20.8 | 23.8 ± 15.6 |
Fibre (g/d) | 1.2 | 2.0 ± 2.8 | ||
As percentage of total energy | ||||
Fat (%) | 40 (AI) | 34 | 32 ± 12 | |
Carbohydrate (%) | 54 | 56 ± 13 | ||
Protein (%) | 12.4 | 13.1 ± 3.9 | ||
Antioxidants | ||||
Vitamin C (mg/d) | 40 (AI) | 53 | 55 ± 45 | |
Vitamin E (mg/d) | 4 (AI) | 6.0 | 7.3 ± 8.6 | |
B vitamins | ||||
Thiamine (mg/d) | 0.3 (AI) | 0.4 | 0.5 ± 0.4 | |
Riboflavin (mg/d) | 0.5 (AI) | 0.7 | 0.8 ± 0.6 | |
Niacin (mg/d) | 3 (AI) | 3.3 | 4.2 ± 3.5 | |
Vitamin B6 (mg/d) | 0.4 (AI) | 0.3 | 0.3 ± 0.4 | |
Folate (μg dietary folate equivalents/d) | 100 (AI) | 73 | 93 ± 92 | |
Bone-related nutrients | ||||
Calcium (mg/d) | 250 (AI) | 470 | 524 ± 424 | |
Phosphorus (mg/d) | 180 (AI) | 366 | 431 ± 293 | |
Magnesium (mg/d) | 65 (AI) | 114 | 120 ± 81 | |
Other micronutrients | ||||
Vitamin A (μgRAE/d) | 350 (AI) | 622 | 697 ± 514 | |
Iron (mg/d) | 10 | 7 | 7.3 | 8.5 ± 6.0 |
Zinc (mg/d) | 3.5 | 2.8 | 4.3 | 4.9 ± 3.3 |
Sodium (mg/d) | 350 | 307 | 564 ± 1005 | |
Potassium (mg/d) | 550 | 515 | 636 ± 479 | |
Selenium (μg/d) | 20 (AI) | 12.3 | 15.2 ± 12.6 | |
Mean intakes of vitamin B6, folate and selenium were below the AIs (0.3 vs. 0.4 mg/d, 93 vs.100 μg/d and 15.2 vs 20 μg/d respectively), suggesting that some infants could have the intakes of these nutrients below the recommendations. Although the mean iron intake was above the EAR, the median iron intake was very close to the EAR (7.3 vs 7 mg/d) indicating that possibly some infants were at risk for inadequate iron intake. Mean intakes of other nutrients generally met or exceeded the recommendations.
Nutrient intakes of toddlers
One-day nutrient intakes from food, beverage and supplements of toddlers aged 12 to 35 months (n = 965)
12 to 23 months | 24 to 35 months | |||||
|---|---|---|---|---|---|---|
Nutrient | RNI or AI | EAR | Median | Mean ± SD | Median | Mean (SD) |
Macronutrients | ||||||
Energy (EER, Kcal/d) | 12–23 months: M 900, F 800 | 953 | 1138 ± 647 | 1060 | 1189 ± 586 | |
24–35months: M 1100, F 1000 | ||||||
Fat (g/d) | 35 | 41 ± 27 | 36 | 41 ± 24 | ||
Carbohydrate (g/d) | 120 | 124 | 154 ± 93 | 144 | 163 ± 91 | |
Protein (g/d) | 25 | 20 | 34 | 41 ± 26 | 40 | 45 ± 24 |
Fibre (g/d) | 3.2 | 4.1 ± 4.1 | 4.1 | 5.9 ± 6.5 | ||
As percentage of total energy | ||||||
Fat (%) | 35 (AI) | 33 | 32 ± 11 | 31 | 31 ± 11 | |
Carbohydrate (%) | 50 ~ 60 | 53 | 54 ± 12 | 54 | 54 ± 12 | |
Protein (%) | 13.7 | 14.5 ± 4.3 | 14.8 | 15.6 ± 4.2 | ||
Antioxidants | ||||||
Vitamin C (mg/d) | 40 | 35 | 59 | 87 ± 91 | 50 | 76 ± 182 |
Vitamin E (mg/d) | 6 (AI) | 10 | 12 ± 8 | 10.3 | 12.4 ± 8.9 | |
B vitamins | ||||||
Thiamine (mg/d) | 0.6 | 0.5 | 0.6 | 0.8 ± .07 | 0.6 | 0.8 ± 0.8 |
Riboflavin (mg/d) | 0.6 | 0.5 | 0.8 | 1.2 ± 1.2 | 0.8 | 1.1 ± 1.0 |
Niacin (mg/d) | 6 | 5 | 6.2 | 7.5 ± 5.5 | 7.2 | 8.8 ± 6.2 |
Vitamin B6 (mg/d) | 0.6 | 0.5 | 0.4 | 0.5 ± 0.6 | 0.4 | 0.6 ± 0.7 |
Folate (μg dietary folate equivalents/d) | 160 | 130 | 112 | 138 ± 108 | 124 | 174 ± 180 |
Bone-related nutrients | ||||||
Calcium (mg/d) | 600 | 500 | 559 | 804 ± 829 | 510 | 646 ± 528 |
Phosphorus (mg/d) | 300 | 250 | 606 | 764 ± 577 | 677 | 762 ± 415 |
Magnesium (mg/d) | 140 | 110 | 129 | 152 ± 95 | 143 | 160 ± 87 |
Other micronutrients | ||||||
Vitamin A (μgRAE/d) | 310 | 220 | 610 | 805 ± 756 | 445 | 587 ± 503 |
Iron (mg/d) | 9 | 6 | 10.8 | 13.3 ± 9.4 | 11.8 | 15.2 ± 13.8 |
Zinc (mg/d) | 4 | 3 | 6.1 | 7.7 ± 5.5 | 6.7 | 7.6 ± 4.4 |
Sodium (mg/d) | 700 (AI) | 1981 | 2399 ± 1757 | 1941 | 2271 ± 2351 | |
Potassium (mg/d) | 900 (AI) | 1052 | 1328 ± 1022 | 1158 | 1343 ± 820 | |
Selenium (μg/d) | 25 | 20 | 23 | 27 ± 21 | 27 | 31 ± 17 |
Discussion
We have described in detail the mean nutrient intakes of a large sample of infants and toddlers from urban areas of China. To our knowledge, this is the first study of its kind and also the first to evaluate mean nutrient intakes from food and beverages and dietary supplements among infants and young children in China. Average household income in this sample tended to be somewhat higher than the average income across urban areas in China [20]. This may reflect the fact that the MING study included three most industrialized cities, Beijing, Shanghai and Guangzhou in China. Therefore, the results of our study provide a snap shot of the diet of young children in modern urban China.
Calories from fat
Lower than recommended intakes of fat (%E) were observed in this study. There was no equivalent or recent data from urban children to compare. However, the low percent of energy from fat found in this study seems to be in line with earlier surveys in China [21], as well as data on this population group from other countries [16]. In the national nutrition survey conducted in 1992, insufficient fat intake (20 to 30 %E) was found among toddlers aged 2 to 3 years [21]. The author of this report commented that the low fat intakes were not meeting the growth needs of young children and might have contributed to the presence of underweight and stunting among young children in China in that time [21]. The results from this study indicated that low fat intakes among young children in China may still exist, even among children living in urban areas. This is typical of the transition from an all milk diet to family meals in many countries. Specific strategies for addressing this issue in the diets of Chinese children could be explored by looking into the specific food sources of energy and nutrients in this population group.
Micronutrients and sodium
Risks of inadequate mean intakes of vitamin B6 and folate were found among infants and younger toddlers. Our study was the first to report the vitamin B6 and folate intakes of young children in China. Previous studies have reported that the folate intakes of adults in China were significantly below the recommendations, especially for those living in northern China possibly due to a lack of fresh fruits and vegetables in cold seasons [22, 23].
Mean and median iron intakes among infants were low, suggesting that there could be a risk of inadequate iron intake in this age group. Low iron intakes, a major cause of iron deficiency anaemia among young children, have been widely documented in China and worldwide [7, 24–27]. Low intakes of iron can potentially lead to developmental delays [28]. It has been reported previously that adults and children in China obtain most of their iron from rice and wheat products, which could be problematic as iron bioavailability from these foods is generally low. The data from our further studies showed that rice and noodles, together with vegetables, contributed about 30 to 43 % of the iron intakes among the toddlers (unpublished data). Therefore, the poor sources and bioavailability of iron could be contributing factors to iron deficiencies observed among young children and pregnant women in China [24].
In this study, very high mean vitamin A intake was found. It is known that common foods consumed in China are plant based and some vegetables commonly consumed, such as Chinese cabbage, are not naturally high in preformed vitamin A. In the past, the prevalence of vitamin A deficiency evaluated by low serum vitamin A level has been reported to be high in China, especially in rural areas [7, 29, 30]. Mothers of young children have been encouraged by doctors and health professionals to give vitamin A supplements such as cod liver oil to their children. In this study, vitamin A supplements indeed contributed on average about 24 % of vitamin A intake among the children (data not shown). This could be, to certain extent, one of the factors causing the excessive intakes of vitamin A observed across all age groups. The contribution of supplements to nutrient intakes among the young children will be investigated in detail in our further studies.
We found high mean sodium intakes among the toddlers in this study. High sodium consumption is one of several dietary factors that may be associated with increased blood pressure, a risk factor for cardiovascular disease. Eating too much salt in childhood could lead to a preference for salty foods later [31]. It is well documented that the salt intakes of adults in China are among the highest in the world, on average 14 g/day in men and 12 g/day in women, as reported by the INTERMAP study in 2003 [32]. Up to now, the information on sodium intake among young children in China was very limited. One previous study reported that the sodium intakes among preschool children aged 3 to 6 years were nearly twice the AI [5]. The average sodium intakes (2399 to 2271 mg) among toddlers in this study were equivalent to 5.7 to 6.0 g salt per day, and far above the AI (700 mg) 1.8 g salt per day. We have also found that the high salt intakes came primarily from home-cooked foods high in salt (Wang et al. submitted together with this manuscript) as has been reported in adult population in China [33]. Our data indicate that this trend of high sodium intake begins very early in China and attention should be given to educating about potential risks of very high sodium intakes.
Limitations of the study
A major limitation of this study was that the information on food consumption among the young children was collected using a single 24-h dietary recall. Although one 24-h recall is sufficient to provide estimates of the average nutrient intakes of a large sample and to characterize the intakes to a certain extent [34], there are random errors due to day to day variation in individual diets which could lead to over or underestimation. Therefore it is not possible to accurately estimate the distribution of nutrient intakes with only one day of intake. The most appropriate way to estimate the prevalence of inadequate intakes of a population is to obtain the usual intakes of the population and use the EAR cut-point method based on the distribution of intakes to estimate [18, 35, 36]. While we have identified a few obvious issues with nutrient intakes in the diets of young Chinese children based on mean and median intakes, it was not possible to conclude with certainty that the other nutrients were consumed in adequate amounts, due to this limitation of using one day of intake. The distributions of intake for several nutrients were quite wide, which one would expect with one day of intake, but questions still remain as to whether any of the other nutrients with very wide distributions might have been issues in the diets of these children. Investigation into the food sources of energy in this sample of children revealed that a significant percent of calories among infants were being contributed by two relatively nutrient poor foods, rice and noodles (23–25 %) (Wang et al. submitted together with this manuscript). This is evidence that further investigation into the nutrient adequacy of the diets of this group of children is warranted.
The second limitation of the study was that the intakes of several important nutrients could not be assessed including saturated fat, vitamin B12, vitamin D and vitamin K, as values for these nutrients were not available from the China Food Composition tables. Therefore, these values in food composition tables need to be improved.
Finally, another possible limitation was that the bioavailability and losses of nutrients during cooking in different food categories was not considered in our current analyses, as the CFC Database provides nutrient composition of foods before cooking. For example the contribution of vegetables, which tend to be cooked before consuming, to nutrients might have been overestimated, especially for water-soluble vitamins.
Conclusions
This was the first large-scale study evaluating the mean nutrient intakes of infants and young children from urban China. Although the diets of infants and toddlers appear to be adequate in mean intakes for most nutrients, several issues were identified. Mean intakes of fat fell below the recommendation and risks of shortfalls in the mean intakes of vitamin B6, folate, iron and selenium were observed among the infants aged 6 to 11 months. The observed high sodium intakes among toddlers indicate that the issue of high sodium intake, also seen in the adult population begins very early. Based on one day dietary intake, we could not conclude that intakes of the other nutrients assessed were adequate for all segments of the population. Further studies that collect multiple 24-h recalls to estimate the usual intake of the population are needed.
Declarations
Acknowledgements
The authors thank the families who volunteered for this study, Laurence Li for project support and guidance, Celia Ning for project management and data collection and local project staff for recruitment and data collection.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
Authors’ Affiliations
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