Health, Nutrition, and Educational Performance
Good health and better learning outcomes are closely associated, according to a large number of studies. Additionally, the converse has been well documented, with worse educational potential linked to poorer health (shorter life expectancy, higher infectious disease rates and poor self-reported health) (Williams 1990; Winkleby et al. 1992; Woodward et al. 1992). In order to address key education obstacles, REAP is focusing on malnutrition, specifically micronutrient (iron) deficiencies.
The Perplexing Puzzle of Anemia in Rural China
Despite rising incomes in China and government commitment to providing quality education, iron deficiency and anemia rates across rural China still remain high. Iron deficiency and anemia lead to compromised ability to learn and poor physical growth, which can impair school performance and ultimately result in retarded cognitive, motor and academic ability. REAP studies in Shaanxi, Ningxia and Qinghai provinces in 2008 and 2009 found that between 39 and 60 percent of school-aged children in rural China were anemic.
The Importance of Iron and Education
According to the Food and Agriculture Organization, global hunger has increased since the 1990’s and reached 854 million undernourished people in 2008. In developing countries, approximately one of every three children under age five (167 million) is malnourished, and over 50 percent of child deaths are linked to malnutrition. Research efforts exploring malnutrition and human development began in the 1930’s, and have been further extended recently by studies focusing on the impacts of malnutrition on intellectual and cognitive abilities. For school-aged children, insufficient nutrition--including iron deficiency--can negatively affect educational outcomes through a number of ways.
Iron Deficiency Anemia
Iron deficiency anemia is a debilitating health condition which affects hundreds of millions of people worldwide, mostly in developing countries (Yip, 2001). Prolonged iron deficiency impairs hemoglobin production, limiting the amount of oxygen that red blood cells carry to the body and brain. As a consequence, anemia leads to lethargy, fatigue and prolonged physical impairment (and in the extreme form, severe anemia can be life-threatening because it reduces the body’s ability to tolerate trauma and bleeding). Moreover, a large body of research links anemia (and even iron deficiency not serious enough to impair hemoglobin synthesis) with cognitive impairment and altered brain function (Yip, 2001).
In addition to short- and long-term health consequences, anemia is doubly burdensome because it also has serious implications for educational performance. Consequently, childhood anemia has been shown to be negatively correlated with educational outcomes, such as grades, attendance and attainment (Halterman et al., 2001; Stoltzfus, 2001; Stoltzfus et al., 2001; Miguel and Kremer, 2004; Bobonis et al., 2006). Early identification and treatment of anemia is crucial since without intervention these cognitive impairments can be irreversible, even after iron status is restored (Lozoff et al., 2000). Anemia may therefore limit children’s opportunities for social and economic mobility and may be an important contributor to the intergenerational transmission of poverty (Bobonis et al. 2006).
Challenges in Rural China
What is perplexing about anemia in rural China is that it is an exception to a commonly observed trend in a number of other countries. Generally, as rates of anemia and iron deficiency fall, incomes rise in an inversely proportional relationship. In rural China, average household incomes have risen, with agricultural commodity prices at all-time highs and unskilled, off-farm wages increasing. Policymakers have instituted a number of policies to benefit rural areas, including new grain and seed subsidies (liangshi butie), health insurance (NCMS) and the rural minimum living standard guarantee (liangmian butie).
Yet surprisingly, in a number of studies a significant share of children across China were still found to be so severely iron deficient as to be classified as anemic (Ministry of Health, 2002). In a 2008 REAP study, a shocking 39% of fourth grade students in Shaanxi province were found to be anemic. A recent study of a rural junior high school in Shaanxi province conducted by the provincial Center for Disease Control found anemia in 40 percent of 5- to 9-year-old students (Wang, 2008). Anemia rates in Qinghai and Ningxia Provinces are 36 percent, based on a 2009 REAP study. A study in Guizhou found anemia rates to be 50 to 60 percent (Chen et al., 2005). Although some of these studies are small-scale and non-representative, they still give rise to concerns that anemia may be a serious problem in rural China for at least a segment of the population.
There are numerous potential causes for the prevalence of anemia. In China’s poor northwestern rural counties, there are a few prime candidates:
Parasitic Worm Infection in Rural China
Aside from dietary factors, intestinal worms can contribute to anemia and have adverse consequences for education, according to the WHO. A well-known study by Kremer and Miguel (2004) shows that deworming in primary schools increased school participation and reduced absenteeism by over 25 percent. Therefore, in identifying the source of the problem in China, another piece of the puzzle is understanding the role (if any) that intestinal worm infections play in iron deficiencies among students in rural China. Although intestinal worms in rural China were once considered a major infectious disease, they appear to have dropped off China’s health “radar screen.”
Nearly half of all people living in developing countries are infected with intestinal worms. Intestinal worms can lead to poor health and poor nutrition, both of which can lead to poor educational outcomes (Bundy 1994, Del Rosso et al. 1996, Drake et al. 1999, Stoltzfus et al. 1997). Anemia, in turn, is often caused by intestinal worms that “steal” nutrients from food before the body can digest them. In addition to causing a variety of health problems, anemia has been shown to negatively affect educational outcomes by hindering cognitive ability and reducing attendance rates (Nokes et al. 1998).
Despite mass public health efforts during the 1950-60’s and 1980-90’s to eradicate intestinal parasites in China, helminth infection appears to remain a serious concern (Wang et al. 2009; Hotez et al. 1997; Xu et al. 2000; Seto et al. 2008; Zhu et al. 2008). In a study of 1 million people by the Chinese Ministry of Health and Chinese Academy of Preventive Medicine, approximately half of the population has worm infections in some poor provinces--particularly the Yangtze river valley provinces such as Anhui, Hubei, Hunan, Jiangxi, Jiangsu, Sichuan, and Yunnan (Hotez, 1997). The infection rates among the more vulnerable groups--such as children in poor, rural agricultural communities--are generally higher. Surprisingly, little is known about the exact determinants of worm infections. There are few disaggregated profiles, and even some reports that worm infection rates are currently low.
In order to effectively prevent iron deficiency anemia and improve educational outcomes, a large-scale policy-relevant approach needs to be considered. A number of central questions still remain, including:
REAP Takes Action
A better understanding of nutritional deficiencies as well as worm infection in rural China is critical in order to address and mitigate the impacts of malnutrition on education. REAP is currently conducting a number of intervention studies in northwestern China as a multi-dimensional approach to achieve the following objectives:
REAP is currently focusing on these objectives in two implementation phases, which coincide with the academic calendar.
Phase I (2008-2009)
Phase II (2009-2010)
Our initial work on worms:
Read more about the educational challenges children in rural China face here.
A National Survey on Current Status of the Important Parasitic Diseases in Human Population（全国人体重要寄生虫病现状调查报告）, May 16,2005, Chinese Center for Disease Control and Prevention, Ministry of Health
Chen, Junshi, Xianfeng Zhao, Xin Zhang, Shian Yin, Jianhua Piao, Junshen Huo, Bo Yu, Ning Qu, Qiliang Lu, Shisun Wang, Chunming Chen. "Studies on the effectiveness of NaFeEDTA-fortified soy sauce in controlling iron deficiency: A population-based intervention trial" Food and Nutrition Bulletin, vol. 26, no.2 (2005)
Miguel, Edward and Michael Kremer. "Worms: Identifying Impacts on Education and Health in the Presence of Treatment Externalities"Econometrica, 2004, 72(1), 159-217
National Working Committee on Children and Women under the State Council（国务院妇女儿童工作委员会）
The Fourth Survey on Nutrition and Health of the Chinese Residents conducted in 2002 under the joint leadership of MoH, MoST, NBS.
Unpublished Study by Weiqing Wang, Associate Professor, School of Public Health, Xi'an Jiaotong University. [Randonly selected middle school in Shaanxi Province, 2007; N=422 1st year students: 37.7% anemia for the whole sample; 34.1% for the sub-sample of boys; 41.0% for the sub-sample of girls, most of whom are slightly anemic in a junior high school in rural Shaanxi.]