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A new stage of the nutrition transition in China

Release time:2012-04-05

    Shufa Du1,2, Bing Lu2, Fengying Zhai1 and Barry M Popkin2,* 1Institute of Nutrition and Food Hygiene, Chinese Academy of Preventive Medicine, Beijing, People’s Republic of China: 2Department of Nutrition, University of North Carolina at Chapel Hill, 123West Franklin Street, Chapel Hill, NC 27516-3997, USA
Abstract
    Objective: To fully explore the long-term shifts in the nutrition transition and the full implications of these changes in the Chinese diet.
    Design: A descriptive, population-based study.
    Setting: Data come from nationally representative surveys: the China Health and Nutrition Survey (1989–1997), the China National Nutrition Survey (1982 and 1992), the annual household consumption surveys of the State Statistical Bureau, and the Annual Death Report of China. Results: During the first part of the major economic transformation in China (before1985), cereal intake increased but decreased thereafter. There was also a long-term reduction of vegetable consumption that has now stabilised. Intake of animal foods increased slowly before 1979 and more quickly after the economic reforms occurred. While the total energy intake of residents has decreased, as has energy expenditure, large changes in the composition of energy have occurred. The overall proportion of energy from fat increased quickly, reaching an overall average of 27.3% and 32.8% for urban residents in 1997. Over a third of all Chinese adults and 60.1% of those in urban areas consumed over 30% of their energy from fat in 1997. Large shifts towards increased inactivity at work and leisure occurred. These changes are linked with rapid increases of overweight, obesity and diet-related non-communicable diseases (DRNCDs) as well as total mortality for urban residents.
    Conclusions: The long-term trend is a shift towards a high-fat, high-energy-density and low-fibre diet. The Chinese have entered a new stage of the nutrition transition.

    China represents one of the more rapidly developing countries in the world. In the past two decades, the annual growth rate of the gross domestic product (GDP) was more than 8%, the highest rate in recent world history1. China has achieved remarkable economic progress and high levels of education, but a rapid evolution of the Chinese diet has accompanied these economic shifts and related social changes. A longer, more detailed history of the Chinese nutrition transition is available2.
    The classic Chinese diet includes cereals and vegetables with few animal foods. It is a diet that many scholars consider most healthful when adequate levels of intake are achieved3. Earlier research by these authors has shown rapid changes in the diets and body composition of Chinese adults during the 1980–91 period4,5. As the classic eating pattern shifts, intakes of cereals and many lower-fat, mixed dishes are being replaced, animal foods are becoming popular, and the consumption of edible oils is increasing quickly. This shift in the composition of diet and corresponding body composition has been accompanied by many positive and some negative changes. Infectious diseases and hunger, important causes of death in the 1950s, no longer affect most of the population. Although malnutrition and nutrition deficiency diseases are still problems that should not be overlooked, the burden is shifting to diet-related, noncommunicable disease (DR-NCD) with a rapid increase in the prevalence of obesity. Fertility and mortality,particularly infant and child mortality, are declining; respiratory diseases are rapidly receding in importance; and life expectancy has reached high levels. Heart diseases, cerebrovascular diseases and cancer are now the major sources of mortality.
    There are five periods of dietary pattern change in China that fit together to mark shifts in the stages of the nutrition transition in China6. This paper shows that China is transforming very rapidly from the pattern of the earliest, receding famine stage, to that of the present, DR-NCD stage. The first period was between 1949 and 1957, when food production was inadequate and low cereal consumption patterns existed. The second period was a sharp decrease in food consumption from 1957 to 1962 during the famine linked with The Great Leap Forward7. The third period, between 1962 and 1979, was one of a strong recovery. The fourth, or reform period, from 1979 to 1985, came after the liberalisation of food production, when the annual economic growth rate was over 10%. After this rapid growth, further economic improvement led to a shift in energy requirements and the structure of the Chinese diet shifted; this is the fifth period presented in Popkin et al.4 (1993). This paper explores the long-term shifts in the nutrition transition through these stages and the full implications of these changes in the Chinese diet.

Subjects and methods

Dietary data
    Data were obtained from three sources. First, data from the 1952 to 2000 annual household consumption surveys8, were used to analyse the long-term transitions in dietary, and nutrition in China. The design of the surveys,undertaken by the State Statistical Bureau (SSB) is similar to a longitudinal survey, but about 20% of households in the sampling communities would be changed each year8.Second, wo rounds of the China National Nutrition Survey (CNNS) data (1982 and 1992) were used in this paper –each from large nation-wide surveys9. From the third source, the China Health and Nutrition Survey (CHNS), rounds of the 1989–1997 data are used6,10. In both cases, dietary data were collected by a combination of the weighing method and three consecutive 24-hour recalls.CNNS and CHNS data are used for the short-term analyses.

Physical activity data
    The CHNS collected detailed data on occupation, work character, labour force, work time and other tems related to physical activities. Physical activity was classified into three categories: light, moderate and vigorous11. The ownership of television (TV) sets was also analysed to reflect the shift in physical activities.

Anthropometric data
    Data from both CNNS and CHNS were used; both surveys measured height and weight12,13. The World Health Organization’s (WHO) cut-off points for body mass index (BMI) were used to define underweight .BMI ,18:5kgm22. and overweight .BMI $ 25 kgm22.: Overweight and obesity .BMI $ 30 kgm22. categories are combined for two reasons. The proportion of BMI $ 30 kgm22 was very low (only 1.5% in 1992) and a recent international group from the WHO-Pacific Region has recommended that a lower BMI cut-off for overweight and obesity of 23 and 25 kgm22, respectively, should be used in Asia14.

Mortality and causes of death data
    These data came from the Annual Death Report from the Ministry of Health of China. Diseases are classified according to WHO’s International Classification of Disease, Injuries, and Causes of Death, version 9 (ICD-9).

Results

Food consumption pattern
    The shift in the Chinese diet follows a classic Westernisation pattern. The economic progress, linked in part to liberalisation of food production controls and the introduction of a free market for food and food products, is linked to these important shifts in diet15. This study focused on shifts in key, separate components of the Chinese diet.

Cereals

    Long-term. There are really five different periods of change in the past. The first period was between 1949 and 1957 when food production was inadequate and low cereal consumption patterns existed. There is a lack of data on cereal consumption during the second period from 1957 to 1962, but there was a sharp decrease in food consumption during the famine linked with The Great Leap Forward7. Per capita intake of cereals increased steadily from 165 kg to 195 kg (1.8 kg annually) in the third period (1962–1979), one of strong recovery. During the fourth or reform period (1979–1985), after the liberalization of food production when the annual economic growth rate was over 10%, China began to import cereals. As a result, per capita intake of cereals increased by 60 kg within six years; 10 kg each year, or a 27.4 g increase each day. Further economic improvement led to a shift in energy requirements, the structure of the Chinese diet shifted, and cereal consumption has declined slowly since 1985; this is the fifth period4.

    Short-term. Both CNNS and CHNS data show that the intake of cereals decreased considerably during the past two decades in both urban and rural areas and among all income groups. During the eight-year period from 1989 to 1997, the total mean intake of cereals decreased by 127 g person21 day21 (67 g person21 day21 for urban residents and 161 g person21 day21 for rural residents). The decrease in the low-income group was the highest (196 g person21 day21) compared with their counterparts in middle- and high-income groups (86 and 85 g person21 day21, respectively).
    The shift away from coarse grain consumption such as millet, sorghum and corn is a key component of this change. CHNS data show a decrease of 38 g person21 - day21 in refined cereals between 1989 and 1997, but an even larger decrease in coarse cereal consumption of 89 g person21 day21. CNNS data show the intake of refined cereals in 1992 to be similar to that in 1982, but the intake of coarse cereals decreased by 59 g person21 day21.

Vegetables and fruits

    Long-term. Urban residents’ intake, which was slightly higher than rural residents’, decreased steadily from 1983 to 1997 and stabilised thereafter. Among rural residents, there was a sharp decrease from 1992 to 1993, a smaller decline from 1993 to 1995, and then a slight increase.
A new stage of the nutrition transition in China
    Short-term. CHNS data show that the total intake of vegetables decreased by 32 g person21 day21 between 1989 and 1997; the intake of vegetables of rural residents decreased by 52 g person21 day21.
    In contrast, the intake of fruits, which are much more expensive than vegetables, showed an increase of 6.9 g person21 day21 from 1989 to 1997. Urban residents’ intake of fruits in 1997 was 2.5 times that of 1989. Rural residents’ intake of fruits increased by 1.8 g person21 - day21 during the same period.
    As a whole, total intakes of vegetables and fruits decreased from 391.8 g person21 day21 in 1989 to 366.7 g person21 day21 in 1997. The largest decrease occurred in the low-income group, from 441.5 to 364.0 g person21 day21, or 77.5 g person21 day21.

Animal foods

    Long-term. Per capita annual consumption of animal foods more than tripled from a very low consumption level of 11 kg in 1952 to 38 kg in 1992. There was a slow rate of increase prior to 1979 but thereafter it was much higher. Intake increased by only 5.6 kg (0.2 kg annually) from 1952 to 1979, while it increased by 21 kg (1.6 kg annually) between 1979 and 1992. Urban residents’ annual intake increased to 65.3 kg person21 in 1999.
    Short-term. Urban residents’ daily intake of animal foods per capita in 1997 was higher than for rural residents (178.2 vs. 116.7 g person21 day21) and also showed a larger increase (46.7 vs. 36.8 g person21 day21) from 1989 to 1997. The amount and growth of intake of animal foods were positively associated with income levels. Intake in the low-income group was 77.6 g person21 day21 in 1997, an increase of 18.6 g; while it was 123.2 and 19.6 g person21 day21 in the middle-income group; and 191.7 and 64.8 g person21 day21 for the high-income group. The intake level and the increase in the highincome group were almost three times those in the lowincome group.

Composition of energy and micronutrients in the diet

    Long-termTrends of energy intake were similar to those of cereals. Total energy intake increased before 1985; then began to decrease. Total energy intake was 2270 kcal (9.50 MJ) in 1952, 2440 kcal (10.21 MJ) in 1982 and 2328 kcal (9.74 MJ) in 1992. Among the energy components, there was little change in the proportion of energy from protein, but the proportion of protein from animals increased considerably. Only 3.1% of protein came from animal foods in 1952, which increased to 18.9% in 1992. The intake of fat doubled (28.3 vs. 58.3 g). Sources of energy changed remarkably: energy from fat increased twofold (11% vs.22%), energy from carbohydrates decreased from 77% to 66%, and energy from animal foods increased from 4.9% to 9.3%.
Table 1 Shifts in energy sources for 20- to 45-year-old adults
(China Health and Nutrition Survey 1989–1997)

                         Percentage                Percentage
                         of energy                 of energy
                          from fat             from carbohydrates


                   1989  1991  1993  1997    1989  1991  1993  1997
Urban              21.4  29.7  32.0  32.8     65.8  58.0  55.0  53.3
Rural              18.2  22.5  22.7  25.4     70.0  65.6  65.2  62.1
Low-income         16.0  19.3  19.7  23.0     72.9  69.2  68.6  64.5
Middle-income      20.3  25.2  25.5  27.1     67.5  62.6  62.2  60.3
High-income        21.5  30.0  31.5  31.6     65.4  57.5  55.4  54.8
Total              19.3  24.8  25.5  27.3     68.7  63.2  62.1  59.8

Short-term
CHNS data show the shift away from carbohydrates to fat in the diet. Energy from carbohydrates for all residents (Table 1) decreased to 59.8% in 1997 from 68.7% in 1989 and to only 53.3% from 65.8% in 1989 among urban residents, the lowest for any group. Energy from fat increased sharply from 19.3% in 1989 to 27.3% in 1997. The shift towards a high-fat diet is shown more pointedly by examining those with low- and high-fat diets, and diets higher in animal fat, from 1989 to 1997. The proportion of adults with a high-fat diet increased by 2.5 times (14.7% vs. 38.5%) within these eight years. The proportion of adult diets with a fat energy of less than 10% declined considerably (18.4% to 3.1%) over this same eight-year period. Over 60% of urban residents consumed more than 30% of energy from fat in 1997.

Physical activity
Energy expenditure at work and the proportion of TV set ownership from 1989 to 1997 were used to measure changes in daily physical activities. Large changes in technology in the workplace and in leisure activities are linked with rapid declines in physical activity. Economic activities are shifting towards the service sector, particularly in urban areas16. The proportion of urban adults working in occupations where they participate in vigorous activity patterns has decreased, and increased where the activity pattern is light. In rural areas, however, there has been a shift towards increased physical activity linked to residents holding multiple jobs and more intensive effort. For rural women, there is a shift towards a larger proportion engaged in more energy-intensive work but there are also proportions where light effort is increasing. In contrast, the proportion of rural men engaged in light work effort has decreased slightly.
    TV set ownership increased considerably during this eight-year period, especially in rural areas and among lower-income groups. In 1997, close to 90% of Chinese Table 1 Shifts in energy sources for 20- to 45-year-old adults (China Health and Nutrition Survey 1989–1997) Percentage of energy from fat Percentage of energy from carbohydrates 1989 1991 1993 1997 1989 1991 1993 1997 Urban 21.4 29.7 32.0 32.8 65.8 58.0 55.0 53.3 Rural 18.2 22.5 22.7 25.4 70.0 65.6 65.2 62.1 Low-income 16.0 19.3 19.7 23.0 72.9 69.2 68.6 64.5 Middle-income 20.3 25.2 25.5 27.1 67.5 62.6 62.2 60.3 High-income 21.5 30.0 31.5 31.6 65.4 57.5 55.4 54.8 Total 19.3 24.8 25.5 27.3 68.7 63.2 62.1 59.8 A new stage of the nutrition transition in China 171 households owned a TV set. Clearly, TV ownership represents a major, potential source of inactivity.

Body composition
There has been a profound increase in the body mass index distribution of Chinese adults, particularly at BMI levels from 23 to 30 kgm22. Overweight and obesity were rare in 1982; only 3.5% of adults, aged 20–45 years, had a BMI above 25 kgm22 and only 0.2% were classified as obese. These rates increased fourfold to 14.1% and 1.3%, respectively, in 1997. The prevalence was much higher in urban areas compared with rural areas (20.9% vs. 14.2%), and this was especially true in large cities. In 1992, more than 40% of urban residents in Beijing were overweight and obese, which would be a serious public health problem9. In the past 15 years, there has been an increase of almost one percentage point per year (0.93) in the prevalence rate, equal to an additional 12 million overweight and obese cases each year.
    At the same time, there is still a meaningful proportion of adults with low BMI who face chronic undernutrition (Table 2). CHNS and CNNS data show that this proportion decreased by 0.4 percentage points yearly during the period 1982–1992, and by 0.2 percentage points yearly between 1992 and 1997.

Morbidity
CHNS blood pressure data show a modest increase in hypertension between 1991 and 1997 among adults aged 30–65 years. Hypertension is greater among males and urban residents, which is not surprising given the greater obesity found in urban areas. Interestingly, the prevalence of hypertension in males in urban areas decreased slightly (not statistically significant) from 1991 to 1997, while it increased among all other groups, especially in rural males.

Mortality of degenerative chronic diseases
The overall death rate decreased between 1974 and 1984, there was no major clear reduction from 1984 to 1990, and a rise since then in urban areas. It increased by 34.7 per 100 000 during this latter period (Fig. 1)17. This shift is noteworthy, as it seems to be concurrent with the increase in DR-NCDs related to the circulatory system and cancer. The 1999 specific mortality of infection and parasite diseases in rural areas, for example, was one-seventh of the 1974 rate (58.2 vs. 8.0 per 100 000), but the mortality of diabetes in urban areas increased fivefold in 1999 compared with 1974 (15.4 vs. 3.4 per 100 000).
Table 2 Trends of BMI distribution for 20- to 45-year-old adults
(China Health and Nutrition Survey 1989–1997)

                                    Distribution (%)
                       BMI , 18:5kgm22            BMI $ 25 kgm22


                  1989  1991  1993  1997     1989  1991  1993  1997

Urban              7.8   7.8   7.7   6.2     10.6  12.1  12.7  18.7
Rural              8.3   8.4   7.3   5.6      8.4  9.9   10.2  13.7
Male               7.4   7.3   6.2   5.5      6.4   8.2   9.1  14.5
Female             8.7   9.1   8.6    6      11.5  12.7  12.6  16.2
Low-income         6.9   9.8   7.4    6       6.3   6.6   9.5  10.9
Middle-income       10   8.1   7.7   6.3      9.1  11.7   10   14.7
High-income        7.5   6.7   7.2   4.5     10.7  13.6  13.5  19.6
Total              8.1   8.2   7.5   5.8     10.3  10.6  10.9  15.4

Discussion

In the half-century since Chinese independence, there have been five major periods related to the stages of the nutrition transition. The country was transformed from one facing famine and extreme food shortages to one where the food supply addressed basic needs; food intake of key food types (cereals, vegetables, animal foods) as well as total energy intake increased. Continuing the shift towards a reduction of malnutrition between 1985 and 1990, total energy began to decrease, and food diversity and animal food intake increased considerably. After 1990, China entered a later stage of the transition as obesity began to increase, energy density of the diet increased considerably, and cereal intake decreased considerably. DR-NCDs began to increase rapidly.

What is the basis for stating a new stage of the nutrition transition was reached?
First, the overall 1999 death rate among urban residents increased to a higher rate than in the early 1970s primarily from DR-NCDs such as cardiovascular diseases, diabetes and cancers. Mortality rates of rural residents are still improving (lowering), but we expect these rates will also shift upwards in the next several decades. Farmers have become richer in many regions of the country and the rural diet is following the same shift towards animal products that urban areas followed (i.e. reduced carbohydrate and increased edible oil and total fat). Adult obesity in rural areas is beginning to increase. Cancer and cardiovascular disease will soon become the major causes of mortality in rural China.
    Second, China is facing simultaneous challenges of malnutrition and overnutrition. In past decades, the government tried its best to solve the malnutrition problem and made great progress. However, the prevalence of malnutrition is still very high: 35% of pre-school children were stunted; 20% of pre-school children, 22% of school children and adolescents, and 8% of adults were suffering from undernutrition18. On the other hand, the prevalence of overweight and obesity has risen to a relatively high degree. Other studies have shown large increases in overweight among pre-school children, older children and teenagers19. For example, 15% (28% in urban areas) of children aged 2–6 years and 8% (12% in urban areas, 11 times that of 15 years ago) of children and adolescents aged 7–17 years were overweight and obese, based on the cut-off points of BMI for overweight and obesity from the International Obesity Task Force (IOTF)18.
    The research by Doak et al.20 highlights this shift in the distribution of under- and overnutrition in a different way. Their research identified households in which overweight and underweight coexist, and explored causative household levels. In China, the prevalence of such householdswas 8%.
    Third, marked shifts in the Chinese diet have been shown. Unlike other East Asian countries such as South Korea (which has actively promoted its traditional diets), China seems to be rapidly relinquishing its traditional diet. The level of fat intake in South Korea is even lower than in China, although China’s gross national product (GNP) was less than 1/14 of the GNP in South Korea in 1996. Starting in the 1990s, people in China obtained more than 20% of energy from fat while South Koreans consumed less than 20% of energy from fat in 199521. Edible oil intake increases unabated in China, as does the intake of other animal products22.
     Also, there has recently been a rapid increase in food consumption from away-from-home sources. Popkin et al.10 have shown the energy consumed at restaurants and stalls in China increased from 0.4% in 1989 to over 7.4% in 1997. Some scholars feel that increased awayfrom- home food consumption is a contributing factor to increased overweight and obesity23.

Acknowledgements

The authors thank Ms Frances L Dancy for her administrative assistance, Bill Shapbell for editing assistance, Tom Swasey for his work on the graphics, and Ms Zhihong Wang and Ms Hongfei Hao for assistance in data collection. Financial assistance for this research has come from the US National Institutes of Health (NIH) (R01-HD30880 and R01-HD38700) and the Fogarty International Center, NIH, National Science Foundation (grant #37486) (for Shufa Du and Bing Lu).

References

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