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Association between awareness of nutrition labeling and high-density lipoprotein cholesterol concentration in cancer survivors and the general population: The Korean National Health and Nutrition Examination Survey (KNHANES) 2010–2016



Nutrition labeling has been found to affect the amount and type of food intake, with certain groups in the population, such as cancer survivors, being more aware of this information. A higher awareness of nutrition labeling is inversely related to the risk of dyslipidemia. This study therefore assessed the association between awareness of nutrition labeling and high-density lipoprotein cholesterol (HDL-C) concentration among cancer survivors in South Korea and in the general population of subjects without a history of cancer.


This cross-sectional analysis evaluated 25,156 adults who participated in the Korean National Health and Nutrition Examination Surveys (KNHANES) from 2010 to 2016. Factors influencing the association between awareness of nutrition labeling and HDL-C concentration in cancer survivors and the general population were determined by multiple regression analysis.


Of the 25,156 participants, 2.88% were cancer survivors and 97.12% had no history of cancer. HDL-C concentrations were higher in subjects who were aware of nutrition labeling than in subjects who were not. Checking or using nutrition labeling had a greater effect on the management of HDL-C concentration for cancer survivors than for the general population.


Awareness of nutrition labeling was associated with better outcomes, including higher controlled HDL-C levels, and reductions in factors increasing the risk of coronary artery disease and cancer, especially in cancer survivors. Health policymakers or medical professionals should develop programs to promote the use of nutrition labeling among cancer survivors in South Korea.

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In South Korea, more than 200,000 patients were newly diagnosed with cancer in 2014. Improvements in early detection and treatment has increased the 5-year survival rate for all cancers, from 41.2% for patients diagnosed between 1993 and 1995 to 70.3% for those diagnosed between 2010 and 2014 [1]. Cancer survivors have a greater risk for cardiovascular disease, cancer recurrence, and second primary malignancies [2, 3]. Therefore, cancer survivors should be more invested in maintaining ideal body weight, a healthy diet, and a physical activity level to prevent chronic diseases, cancer recurrence, and second primary cancers [4]. Dietary interventions have been shown to improve diet quality, body weight, and nutrition-related biomarkers [4]. Low-fat diets have been found to promote changes in serum lipids, cytokines, and angiogenic factors [5]. Plasma concentrations of high-density lipoprotein-cholesterol (HDL-C) have shown a strong inverse relationship to the risk of developing coronary artery disease (CAD) and cancer [6,7,8]. On the other hand, a low concentration of HDL-C is associated with obesity [7].

Nutrition labeling of foods became compulsory in South Korea in 1995 [9], to assist consumers in making reasonable choices based on nutrition values by confirming the nutritional properties of processed foods [9, 10]. Nutrition labeling has been found to affect the intake of total fats, carbohydrates and saturated fats, as well as awareness of the nutritional contents of foods, which may be helpful in managing certain chronic diseases [11]. Moreover, greater awareness of nutrition labeling in a South Korean population was inversely related to the risk of dyslipidemia, especially regarding imbalances of HDL-C and triglycerides [12]. The introduction of nutrition labeling of foods in South Korea was expected to provide food-related health information to the South Korean population, cancer survivors included, to help them better manage their health. For that reason, this comparative study aimed to assess the association between individual nutrition concerns and HDL-C concentration among South Korean cancer survivors and the general population without a history of cancer.


Study population

The data used in this study were obtained from the Korea National Health and Nutrition Examination Surveys (KNHANES) V–VII, 2010–2016. KNHANES are cross-sectional surveys conducted annually since 1998 by the Korea Centers for Disease Control (KCDC) using a stratified, multistage, cluster sampling design. Each survey consists of three types of questionnaire: A Health Interview Survey, a Health Examination Survey, and a Nutrition Survey. Of the 71,723 respondents, those diagnosed with cancer and undergoing cancer treatment or respondents without blood test results were excluded. In addition, to compare the impact of nutrition information awareness between cancer survivors and the general population, we only included persons aged over 30 years. We also excluded those who did not respond to the nutrition information awareness questions in order to reduce the uncertainty caused by incomplete surveys. A total of 25,156 participants were deemed eligible for this study.


To compare differences between cancer survivors and the general population in their awareness of nutrition information, the main outcome variable was defined as serum HDL-C concentration on the survey date. A 40–60 mg/dL concentration of HDL-C was considered normal.

Awareness of nutrition information was divided into three categories: 1) checks nutrition information and makes label-dependent purchase decisions; 2) checks nutrition information but does not make label-dependent purchase decisions or is aware of nutrition information but does not check them when making food purchase decisions; and 3) is unaware of nutrition information. Other independent variables included cancer survivor, sex, age, level of education, household income, body mass index (BMI), aerobic exercise habits, smoking status, high-risk drinking, any family history of hyperlipidemia, survey year, stress awareness, subjective health status, frequency of eating-out, total cholesterol concentration, triglyceride concentration, low-density lipoprotein-cholesterol (LDL-C), and average daily intake (energy/carbohydrates/fats).

Cancer survivors were defined as cancer patients who were not undergoing cancer treatment at observation time, with other subjects defined as the general population. Age categories included age < 30 years, 30–39 years, 40–49 years, 50–59 years, and ≥ 60 years. BMI categories included BMI < 23 kg/m2 (underweight or normal), BMI 23–25 kg/m2 (overweight), and BMI > 25 kg/m2 (obese). A family history of hyperlipidemia was defined diagnostically in first-degree relatives. The cutoff for weekly aerobic exercise time was defined as 150 min. High-risk drinking was defined as the consumption of more than seven (males) or five (females) drinks on a single occasion at least twice a week. The average daily intake was based on the food intake questionnaire, which was designed as an open-ended survey for reporting various dishes and foods using the 24-h recall method [13]; energy intake was calculated using these data.

Statistical analysis

Categorical variables were reported as frequency and percentage, and continuous variables as mean and standard deviation. Chi-square tests were performed to determine the association of independent variables and awareness of nutrition labeling for both cancer survivors and the general population, as well as to determine the relationship of each variable with cancer status. The relationship of continuous variables with HDL-C concentrations was determined by analysis of variance (ANOVA) and is displayed in Additional file 1: Table S1. After adjusting for covariates in cancer survivors and the general population, multiple linear regression analysis, utilizing gamma distribution, was performed to assess the relationship between the use of nutrition data and HDL-C concentration. Subgroup analyses were also performed by sex, frequency of eating-out, and subjective health status. Sampling weight was applied to each participant to generalize the data. All statistical analyses were performed using SAS version 9.4 (Cary, NC, USA).


Of the 25,156 subjects, 724 (2.88%) were cancer survivors and 24,432 (97.12%) had no history of cancer. Table 1 shows the characteristics of both groups. We found that approximately 20% of all respondents actively checked and made purchase decisions based on nutrition information, but that the percentage was significantly lower in cancer survivors than in the general population (16.30% vs. 19.32%, p < 0.0001). Cancer survivors were significantly older and of lower socioeconomic status but had healthier lifestyles than the general population in their behaviors of smoking, drinking, eating-out habits, and daily nutritional intake.

Table 1 General characteristics of the study population

Based on previous reports, nutrition factors could have a positive effect on the management of triglyceride and HDL-C [14]. Among four key indicators: total cholesterol, triglyceride, HDL-C, and LDL-C, the triglyceride and HDL-C concentrations were associated with active use of nutrition information. Similarly positive impacts of nutrition labelling were reported in a previous study, showing a decrease of triglycerides and an increase of HDL-C by active use of nutrition information [12]. In this study, we focused on comparing the positive impacts of nutrition information awareness between cancer survivors and the general population. However, triglyceride results alone were not meaningful among cancer survivors (Additional file 1: Table S2). Thus, we decided to only focus on HDL-C to compare the positive impact of using nutrition information. Table 2 shows the findings of multiple gamma linear regression analysis for the relationship between nutrition information awareness and HDL-C level in all respondents. HDL-C concentrations were higher in subjects who checked, or were aware of, nutrition information (Relative Risk [RR]: 1.0017, 95% Confidence Interval [CI]: 1.0004–1.0031, p = 0.0131), and while there was no significant difference in these subjects, those who made purchase decisions based on nutrition labelling had positive increases of HDL-C (p = 0.1785).

Table 2 Multiple regression analysis of the association between nutrition labeling awareness and subject characteristics

HDL-C concentrations did not differ between cancer survivors and the general population. By other covariate analyses, female or younger subjects had higher HDL-C level than male or older subjects. Additionally, subjects with lower BMI were more likely to have higher HDL-C concentrations than the obese group. Subjects with heathy behaviors: non-smoker, mild drinker, or people with less frequency of eating-out, had healthier HDL-C concentrations. The results of the daily intake of nutrition survey show that respondents with lower carbohydrate or fat intake had higher HDL-C. In addition, triglyceride and LDL-C concentrations were inversely related to HDL-C concentration.

Table 3 displays the results of multiple linear regression analysis for cancer survivors and the general population. The active use of nutrition information had a positive correlation with higher HDL levels, particularly in cancer survivors. When compared to cancer survivors who did not check nutrition information, significantly higher HDL-C concentrations were seen in cancer survivors who checked and made label-dependent purchase decisions (RR: 1.0117, 95% CI: 1.0001–1.0233, p = 0.0479), as well as those who checked or were aware of nutrition information, but did not make labeling-dependent purchase decisions (RR: 1.0121, 95% CI: 1.0036–1.0205, p = 0.0050). In the general population, only those who checked or were aware of nutrition information had significantly higher HDL-C concentrations compared to those unaware of nutrition information (RR: 1.0015, 95% CI: 1.0001–1.0028, p = 0.0349). Covariate analyses showed that female, younger, or low BMI was associated with higher HDL-C in only the general population, and not cancer survivors. Similar results were observed among those with unhealthy behaviors such as smoking, drinking, or eating-out, which were only significant in the general population. However, daily carbohydrate or fat intake was inversely associated with HDL-C concentrations in both groups, and triglyceride and LDL-C concentrations were inversely related to HDL-C concentration.

Table 3 Multiple regression analysis of the association between nutrition labeling awareness and outcome variables in cancer survivors and general population

We performed subgroup analysis to identify factors that influence the association between awareness of nutrition information and HDL-C levels. Based on descriptive statistics for subgroups, linear differences of HDL-C levels were observed in females regardless of their group type. In the general population, females with less eating-out behavior had more linear trends than the cancer survivors. On the other hand, when compared to others, cancer survivors with good subjective health had more associations (Table 4). The results of subgroup analysis for multiple linear regression show that female gender and a reduced frequency of eating-out were significantly related to this association, regardless of cancer status. However, the impact of nutrition labelling awareness was greater in cancer survivors than the general population. In contrast, subjective health status had slightly different effects in cancer survivors and the general population (Additional file 1: Figure S1).

Table 4 The means and SD of HDL-C levels according to sex, frequency of eating out, and subjective health status


Healthy lifestyles, including physically activity, a normal body weight, and a healthy diet, have been associated with a reduced risk of primary cancer [15, 16]. Such lifestyles have been shown to prevent tumor recurrence, second primary cancers, and other chronic diseases in cancer survivors [4]. Therefore, many cancer survivors seek information on healthy food, dietary supplement use, complementary nutrition products, and physical activity to improve their response to cancer treatment, achieve a rapid recovery, reduce the risk of cancer recurrence, and have a good quality of life [4, 17]. In addition, improvements in dietary behavior may also reduce the adverse effects of cancer and its treatment [3, 4]. The American Cancer Society (ACS) and the World Cancer Research Fund/American Institute for Cancer Research (WCF/AICR) proposed recommendations for diet to further emphasize the importance of weight management and nutrition. These recommendations encourage the consumption of fruits, vegetables, and unrefined whole grains, and limit the intake of energy dense foods such as sugars, fats, and a variety of processed foods [3, 4, 16]. In South Korea, nutrition labeling of food products reveals nutrition information such as serving size, calories, and carbohydrate, protein, fat, sodium, sugar, cholesterol, saturated fatty acid, trans fatty acid, and unsaturated fatty acid content. Awareness of nutrition labeling has been associated with positive results on lipid profiles, especially on HDL-C and triglyceride concentrations in the South Korean population [12]. A low serum concentration of HDL-C is a risk factor for cardiovascular disease [6, 18]. Moreover, each 1 mg/dL increase in HDL-C levels reduces the risk of coronary artery disease by 2 to 3%, independent of low-density lipoprotein (LDL) and triglycerides levels [19]. Furthermore, HDL-C concentration is inversely associated with cancer incidence, regardless of sex, age, smoking status, LDL-C, BMI, and diabetes [8, 20, 21]. We therefore hypothesized that nutrition label awareness would significantly affect diet-related health status, especially HDL-C in cancer survivors, and explored the possible association between awareness and HDL-C.

This study showed that HDL-C levels were higher in respondents who checked or were aware of nutrition information than in those who did not, but the HDL-C levels did not differ between respondents who checked nutrition information and made purchase decisions based on this information. Subgroup analysis showed a similar pattern in both cancer survivors and the general population when aware of nutrition labelling and checking it. In cancer survivors, HDL-C concentrations were significantly higher in those who check nutrition facts and make labeling-dependent purchase decisions, than in cancer survivors unaware of nutrition information. This pattern was not observed in the general population. Similarly, a previous study showed that nutrition awareness, i.e., checking nutrition information and actively using it, had positive effects on outcome indicators such as HDL-C and triglyceride levels in a South Korean population that included cancer survivors [12].

This study also shows that awareness of nutrition labeling (checking) or healthy behavior groups such as low BMI, non-smoking status, less eating-out, and low daily carbohydrate/ fat intake measured in grams, were independently associated with higher HDL-C levels in the general population. High awareness of nutrition labelling may lead to improved nutritional intake, including low-fat and low-carbohydrate diets. On other hand, among cancer survivors, there were no significant associations of healthy behaviors. The appearance of these results may be caused by their clinical condition following cancer treatment as compared to the general population. Thus, they might not be as responsive to healthy behaviors as the general population. Our finding that aerobic exercise habits were not independently associated with HDL-C levels in cancer survivors, suggests that a better diet may be a more important factor for increasing HDL-C levels in South Korea. Similarly, greater adherence to ACS guidelines was related to higher social functioning scores, suggesting that diet may be an important indicator in quality of life among Korean breast cancer survivors [22].

To the best of our knowledge, this is the first study to describe the association between awareness of nutrition labeling and HDL-C level among cancer survivors in a general population in South Korea. Our use of nationwide sampling data over a 5-year period may help establish long-term health policy at the national level [12]. However, this study had some limitations. First, KNHANES collected information, including cancer history and awareness of nutrition labeling, using self-reported questionnaires, but did not collect information about cancer stage or phase of care. Thus, there may have been recall bias, which may have influenced our outcomes of interest. Second, KNHANES is conducted for the general Korean people and the survey takes 1.5 to 2 h to complete. Therefore, the number of cancer survivors was relatively small, and only healthy cancer survivors might have been able to participate. Third, nutrition label awareness could be a proxy variable for health awareness or other healthy behavior variable. Therefore, self-reported nutrition label awareness may not fully reflect their actual behavior, e.g., reading nutrition label once out of every 100 opportunities.

This study showed that high awareness of nutrition labelling is associated with high HDL-C level, which is associated with reduced risks of cardiovascular disease and/or cancer. Moreover, this association was greater in cancer survivors than in the general population. The concerns of healthy behaviors by cancer survivors the need for guidelines directed to South Korean cancer survivors are increasing. Health policy makers and medical professionals may be aided by the results of this study in developing effective measures such as body weight control, smoking cessation, reducing and maintaining a low daily fat intake as well as promoting the use of nutrition labeling across this population. Further research is needed to determine the methods of increasing individual interest in nutrition. Moreover, randomized controlled trials are needed to show the benefits of a healthy diet on HDL-C levels in cancer survivors.


Awareness of nutrition labeling increased serum concentrations of HDL-C, a factor associated with coronary artery disease and the risk of cancer incidence. Active use of nutrition information correlated positively with higher HDL-C levels, especially among cancer survivors. Our findings suggest that health policy in South Korea should include the promotion of nutrition labeling for cancer survivors.



American Cancer Society


Body mass index


Coronary artery disease


high-density lipoprotein cholesterol


Korea Centers for Disease Control


Korean National Health and Nutrition Examination Surveys ()


Low-density lipoprotein cholesterol


World Cancer Research Fund/American Institute for Cancer Research


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JSY and KTH designed the study, collected data, performed statistical analyses, and wrote the manuscript. JSY, KTH, SHC, and ECP contributed to the discussion and reviewed and edited the manuscript. ECP is the guarantor of this work and as such, had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analyses. The text in this document has been checked by professional editors who are native English speakers. All authors have read and approved the final manuscript.

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Correspondence to Eun-Cheol Park.

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These data were approved by the KCDC Institutional Review Board, and all participants provided written informed consent (2010-02CON-21-C, 2011-02CON-06-C, 2012–01-EXP-01-2C, 2013-07CON-03-4C, and 2014-12EXP-03-5C).

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Additional file

Additional file 1:

Table S1. Associations between subject characteristics and serum HDL-C concentrations in cancer survivors and the general population. Table S2. Multiple regression analysis of the association between nutrition labeling awareness and outcome variables in cancer. Figure S1. The results of the subgroup analyses of the relationship between nutritional information awareness and HDL-C levels according to sex, frequency of eating out, and subjective health status. *The RR as marked to the square points was calculated by multiple regression analysis adopting gamma distribution to investigate the association between awareness on nutrition labelling and HDL-C. Results were considered statistically significant if each bar marked to SD did not reach the cut-off line of 1.0000. † The means and SD of each group were shown in Additional file 1 Figure S1. (DOCX 251 kb)

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Yoo, J.S., Han, KT., Chung, S.H. et al. Association between awareness of nutrition labeling and high-density lipoprotein cholesterol concentration in cancer survivors and the general population: The Korean National Health and Nutrition Examination Survey (KNHANES) 2010–2016. BMC Cancer 19, 16 (2019).

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  • Nutrition facts
  • HDL-C
  • Cancer survivors
  • Tertiary cancer prevention
  • Nutrition labeling