곤충 Laccifer lacca의 분비물인 stick lac에서 얻어지는 락색소는 물에 용해되는 붉은색 식용 색소로, 식품에 붉 은 색을 더하는 착색제이다. 주요 성분은 안트라퀴논계 기 반의 laccaic acid로 A, B, C, D, E로 구성된다. 본 연구 의 목적은 HPLC-DAD를 활용하여 laccaic acid를 정량적 으로 분석할 수 있는 방법을 검증하는 것과 섭취 노출량 을 산출하는 것이다. 제안된 분석법은 특이성, 선형성, LOD, LOQ, 정확성, 정확도 등 다양한 검증 항목에서 평 가되었으며, 매트릭스 효과 또한 충분히 고려되었다. 모든 매트릭스에서 검량선은 높은 선형성 (R20.999)을 보였고, 락색소의 MDL과 MQL은 각각 1.93 mg/kg와 5.86 mg/ kg로 확인되었다. 일내 및 일간 회수율 시험에서 정확도 는 91.5-100.9% 사이였고, 정밀도는 0.8-2.6%RSD로 AOAC 기준을 충족하였다. 한국에서 유통되는 다양한 식 품들을 수집하여 락색소를 모니터링하여 식품 유형별 락 색소 섭취 노출량을 평가하였다. 락색소 섭취 수준의 범 위는 국민전체, 섭취자 각각 0.0000-0.0027 mg/kg·bw/day 와 0.0000 -0.0306 mg/kg·bw/day였다. 개발된 분석법은 다 양한 식품 유형에 적용 가능하여 락색소 추출물의 효과적 인 모니터링을 가능하게 하며, 섭취량 평가를 통해 락색 소의 안전성 평가에 추가적으로 활용될 수 있을 것이다.

This study investigated dietary behaviors, nutrient intake, and quality of life among elderly individuals living alone compared to those in multi-person households. Data were obtained from 5,311 individuals aged 65 years and older who participated in the 2015-2019 Korea National Health and Nutrition Examination Survey (KNHANES). Nutritional intake was assessed by analyzing the proportion of individuals with insufficient intake relative to the Korean Dietary Reference Intakes (KDRIs) and the Acceptable Macronutrient Distribution Range (AMDR). Quality of life was measured using the EQ- 5D instrument. The results showed that single-person households were more likely to be female, older, and have lower income and education levels compared to multi-person households. Additionally, single-person households were more likely to skip breakfast, eat at places other than home, eat alone, and dine out less frequently. Nutritional intake was lower among elderly individuals living alone. Furthermore, after adjusting for relevant variables, single-person households were significantly more likely to report poor quality of life (OR: 1.05, 95% CI: 1.07-1.28)—defined as being in the lowest 20% of EQ-5D scores—compared to those in multi-person households. The findings highlight the need for targeted nutritional support and policy interventions to improve dietary intake and quality of life among elderly single-person households.

This study analyzed the changes in sodium content across different types of kimchi over various storage periods, distinguishing between solids and seasoning (liquid), to better estimate actual sodium intake and improve the food composition databases. Six types (baechu-kimchi, oi-sobagi, buchu-kimchi, baek-kimchi, dongchimi, and nabak-kimchi) were analyzed using ICP-AES. The results were compared with salinometer readings, food composition databases, and nutrition labels from commercial products. Statistical analyses included the Mann-Whitney U test and the Kruskal-Wallis test (=0.05). The findings showed that the seasoning had significantly higher sodium content than the solids and, except for baechu-kimchi and nabak-kimchi, accounted for more than 50% of the total sodium content. Sodium content varied across kimchi types and changed over storage time. Additionally, sodium content measured by ICP-AES significantly differed from those in the food composition databases and commercial nutrition labels, which often over or under-estimated values. Moreover, sodium content in commercial kimchi products exhibited up to a 581-fold difference between the minimum and maximum values. These results suggest that current databases and labeling systems, which do not distinguish between solids and seasoning, may misrepresent the actual sodium intake. Further research and regulatory measures are needed to improve sodium estimation and consumer guidance.

본 연구는 성장 단계별 돼지의 평균 사료 섭취량을 추정하고, 각 매개변수 간의 상관분석을 통해 변수를 선별한 후, 기계학습 기반 회귀분석을 통해 돼지의 사료 섭취량(FI)을 예측하는 모델을 만들고자 한다. 본 실험은 2023년 9월 14일부터 2023년 12월 15일까지 93일 동안 진행하였다. 사료는 09:00와 17:00 하루에 2회 제공하였으며, 제공된 사료의 양은 돼지의 평균 체중의 5%를 지급하였다. 돼지의 몸무게(PBW)는 매일 09:00에 이동식 돈형기를 사용하여 측정하였다. 축산환경관리시스템(LEMS) 센서를 이용하여, 돈사 내 온도(RT), 상대습도(RH), NH3를 5분 간격으로 수집하였다. 성장 단계를 3단계로 나누었으며, 각 GS1, GS2 및 GS3으로 명명하였다. 각 성장 단계별 평균 사료 섭취량과 표준편차를 구하여, 유의미성과 성장 단계별 사료 섭취의 경향을 분석하였다. 각 모델의 성능평가( , RMSE, MAPE) 시 8:2의 비율로 데이터를 분할하여, 정확도 검증을 수행하였다. 연구 결과 성장 단계별 돼지의 사료 섭취량에 유의미한 차이(p < 0.05)가 있음과 돼지가 성장할수록 일정한 양의 사료를 섭취하는 것을 확인하였다. 또한 각 변수의 상관분석 시 FI와 PBW에서 강한 상관관계가 나타났으며(R > 0.94), 각 모델의 성능평가 결과 RFR 모델이 가장 높은 정확성(  = 0.959, RMSE = 195.9, MAPE = 5.739)을 보였다.

This study examined the intake status and the factors affecting intake of functional foods using the data from Consumer Behavior Survey for Food by the Korea Rural Economic Institute. Among the total respondents, 80.4% took functional foods, and the number of respondents who took two types of functional foods was the highest. The main reason for taking functional foods was to prevent disease, and the main places of purchase of functional foods were off-line large supermarkets, on-line shopping malls, and pharmacies. Compared to a year ago, the percentage of increase in functional food purchases this year was higher than the percentage of decrease. The most common reasons for not taking functional foods were ‘not feeling the need’ and ‘not trusting the quality’. As a result of conducting a complex samples logistic regression analysis to identify the factors affecting the intake of functional foods, gender, age, marital status, illness state, alcohol drinking, and convenience-seeking type among dietary lifestyles were significant.

This study aimed to examine relationships of water and dietary fiber intake with various health-related factors using data from the 2016~2019 Korea National Health and Nutrition Examination Survey (KNHANES). A total of 8,419 adults aged 19~49 years were categorized into four groups: (1) sufficient intake of both water and fiber (Type 1) (n=2,235), (2) water deficiency with sufficient fiber (Type 2) (n=1,470), (3) fiber deficiency with sufficient water (Type 3) (n=1,031), and (4) deficiency in both water and fiber (Type 4) (n=3,683). General characteristics, body composition, health behaviors, dietary habits, nutrient and food intake, and dietary quality were compared. Type 4 had more female (p=0.028), older adults (p<0.001), and higher socioeconomic status (p<0.001) than Type 1. Type 1 consumed breakfast more frequently (p<0.001). Nutrition label recognition, usage of nutrition label, and all nutrient intakes were the highest in Type 1 but the lowest in Type 4. Type 1 also had better dietary variety score and nutritional quality. These findings highlight the importance of adequate water and fiber intake for balanced nutrition and suggest that targeted nutrition education is needed, especially for male and low-income groups with insufficient intake.

The yellow mealworm beetle, Tenebrio molitor L. (Coleoptera: Tenebrionidae), has long been used as a key study organism in many fundamental researches, including biochemistry, physiology, and behavior. Lifespan and reproduction are two of the most important components of fitness in all insects, but it remains largely unexplored how these two traits are influenced by macronutrient intake in this beetle. In this study, we used the nutritional geometry framework to analyze the complex and interactive effects of dietary protein and carbohydrate intake on lifespan and reproductive performance in T. molitor beetle. Lifespan and the number of eggs laid throughout the lifetime were quantified from more than 2,000 individual beetles provided with one of 35 chemically defined diets representing a full combination of seven protein-to-carbohydrate ratios (P:C= 0:1, 1:5, 1:2, 1:1, 2:1, 5:1, or 1:0) and five protein plus carbohydrate concentrations (P+C=25.2, 33.6, 42, 50.4, or 58.8 %, dry mass). All measures of lifespan and egg production were expressed highly at high caloric intake, but they differed in the optimal P:C ratio where traits peaked. While lifespan was the longest at a moderately carbohydrate-biased P:C ratio of 1:1.36, the rate of egg production was maximized at a protein-biased P:C ratio of 1.75:1, suggesting a possible nutrient-mediated trade-off between lifespan and daily reproductive efforts in T. molitor beetles. Lifetime egg production was maximized at a P:C ratio of 1.31:1, which was still protein-biased but lower than that maximized egg production rate. Reproductive lifespan was the longest at a P:C ratio of 1:1.06. When given a food choice, T. molitor beetles preferred a P:C ratio of 1:1, which is closest to the ratio that enables T. molitor beetles to stay reproductively active as long as possible.

Salt is crucial for survival, yet excessive intake of sodium chloride can have adverse effects. In the fruit fly, Drosophila melanogaster, internal taste organs located in the pharynx play a pivotal role in determining whether to accept or reject food. However, our understanding of how pharyngeal gustatory receptor neurons (GRNs) perceive high salt levels is still limited. In this study, we discovered that a specific member of the ionotropic receptor family, Ir60b, is selectively expressed in a pair of GRNs that respond to high salt concentrations. Through a two-way choice assay (DrosoX) to measure ingestion volume, we established that IR60b, along with two coreceptors, IR25a and IR76b, is necessary to deter excessive salt consumption. Interestingly, mutants lacking external taste organs but retaining internal taste organs in the pharynx showed significantly higher salt avoidance compared to flies missing all three IRs while still possessing all taste organs. These findings underscore the crucial role of IRs in pharyngeal GRNs in regulating the intake of high salt levels.

This study aimed to investigate the relationship between the nutrition quotient and the dietary intake of adolescents. A total of 393 adolescents were surveyed to evaluate their Nutrition Quotient for Korean Adolescents (NQ-A) scores and dietary intake. The average age of the survey subjects was 15 years and the average NQ-A score of the subjects was 49.11±13.35. There was no significant difference in the NQ-A scores according to gender and age. The average dietary diversity score was 3.77±0.85, and it was significantly higher in boys than in girls (p< .05) with the scores of 12-14-year-old students being significantly higher than those aged 15-18 years (p< .01). The results of comparing the percentage of recommended intake or adequate intake and the mean adequacy ratio (MAR) according to the NQ-A grade, showed that the ‘High’ grade had a significantly higher intake percentage of vitamin B1, B12, folate, phosphorus, iron and a significantly higher MAR (p< .05). From a long-term perspective, efforts to improve dietary habits are deemed necessary to meet an individual’s nutritional requirements. Adolescents themselves should develop proper eating behaviors and acquire suitable dietary management skills to enhance their nutritional status, ultimately contributing to an improvement in their quality of life.

본 연구는 8주간의 고강도 동계 훈련 시 L-아르기닌 섭취가 남자 대학 태권도 겨루기 선수의 경기수행능력, 젖산, 젖산탈수소효소 및 암모니아에 미치는 영향을 구명하기 위해 L-아르기닌 섭취군 (n=14), 위약군(n=14)으로 구분하여 실시하였다. L-아르기닌 섭취군은 일일 아침 1 g, 점심 1 g, 저녁 1 g으로 총 3 g 섭취하였고 위약군은 말토덱스트린을 동일한 방법으로 섭취하였다. 8주간의 동계 훈련 프로그램은 70-90%HRR로 실시하였다. 측정된 자료의 L-아르기닌 섭취군과 위약군 간의 그룹 및 시기 간 상 호작용 효과는 two-way repeated measures ANOVA, 그룹 내 시기 간 차이는 paired t-test를 사용하였으 며, 그룹 간 차이는 independent t-test를 사용하여 분석하였다. 그 결과 TAAA (Taekwondo-specific aerobic anaerobic agility) test를 통한 경기수행능력 중 평균 발차기 수에서 그룹×시기 간 상호작용 효과 가 나타났으며 그룹 간 주효과가 나타났다(p<.05). 또한, 발차기 피로지수에서 그룹×시기 간 상호작용 효 과가 나타났다(p<.05). 한편, 젖산에서는 시기 간 주효과가 나타났으며(p<.05) 젖산탈수소효소에서 상호작 용 효과 및 시기 간 주효과 나타났다(p<.05). 암모니아의 경우 그룹×시기 간 상호작용 효과가 나타났다 (p<.05). 이러한 결과는 남자 대학 태권도 겨루기 선수의 고강도 훈련 후 피로에 쉽게 노출되는 선수들에게 L-아르기닌 섭취로 인해 체내 피로 유발 물질들을 신속하게 제거하는 데 긍정적인 역할을 할 수 있다고 사료된다. 따라서 고강도 엘리트 태권도 겨루기 운동선수의 경기수행능력 향상과 피로 회복 방법으로 L- 아르기닌 섭취를 권장한다.

Considering that the number of middle-aged single-person households is increasing, this study investigates dietary behaviors, nutrient intake, and mental health according to household type. Data were procured from the 2015-2019 Korea National Health and Nutrition Examination Survey (KNHANES). Totally, 5,466 participants aged 50-64 years were classified into 2 groups: a household with one member was defined as a single-person household, and households with two or more members were described as multi-person households. Single-person households comprised 10.63% of the total, with a higher average age, and lower income and economic levels than multi-person households. Compared to multiperson households, single-person households had a higher frequency of skipping breakfast, eating alone, and dining out, the moderately and severely food insecure group was more than 5 times, and nutrient intake and dietary quality were poorer. In the fully adjusted model, the odds ratios (ORs) of depressive symptoms were 2.35 times (95% CI: 1.39-3.96), and suicide ideation was 1.95 times (95% CI: 1.35-2.82) in single-person compared to multi-person households. Our results lead us to conclude that poor dietary intake in middle-aged single-person households affects the mental health, and the above factors should be considered when framing the dietary policy.

This study was performed to evaluate the pollutants removal characteristics of two types of RBFs(Riverbank filtration, Riverbed filtration) intake facilities installed in Nakdong River and in Hwang River respectively. The capacity of each RBF is 45,000 ㎥/d for riverbank filtration intake facility and 3,500 ㎥/d for riverbed filtration intake facility. According to data collected in the riverbank filtration site, removal rate of each pollutant was about BOD(Biochemical oxygen demand) 52%, TOC(Total organic carbon) 57%, SS(Suspended solids) 44%, Total coliforms 99% correspondingly. Furthermore, Microcystins(-LR,-YR,-RR) were not found in riverbank filtered water compared to surface water in Nakdong River. DOC(Dissolved organic carbon) and Humics which are precursors of disinfection byproduct were also reported to be removed about 59% for DOC, 65% for Humics. Based on data analysis in riverbed filtration site in Hwang River, removal rate of each contaminant reaches to BOD 33.3%, TOC 38.5%, SS 38.9%, DOC 22.2%, UV254 21.2%, Total coliforms 73.8% respectively. Additionally, microplastics were also inspected that there was no obvious removal rate in riverbed filtered water compared to surface water in Hwang River.

This study examined the determinants of healthy food purchases before and after COVID-19 in Korea. Binomial and multinomial logistic regression models were applied to Korea Rural Economic Institute's Food Consumer Behavior Survey data from 2019 to 2021. The analysis revealed a significant decrease in the non-intake of healthy food in 2021 compared to 2019, suggesting the impact of COVID-19 on healthy food consumption. Consumption patterns also changed, with a decrease in direct purchases and an increase in gift-based purchases. Several variables showed significant effects on healthy food intake. Single-person households exhibited a higher probability of eating healthy food after COVID-19. The group perceiving themselves as healthy had a lower likelihood of consuming healthy food pre-COVID-19, but this changed after the pandemic. Online food purchases, eco-friendly food purchases, and nut consumption showed a gradual decrease in the probability of non-intake over time. Gender and age also influenced healthy food intake. The probability of eating healthy food increased in the older age group compared to the younger group, and the probability increased significantly after COVID-19. The probability of buying gifts was significantly higher in those in their 60s, indicating that the path to obtaining healthy food differed by age.

본 연구는 제15차(2019) 청소년건강행태조사의 원시자료를 활용하여 생물-심리-사회 모델을 바탕으로 우리나라 청소년의 편의식품 섭취 경험의 영향요인을 파악하고자 하였다. 연구 결과 생물학적 요 인으로 성별, 학년, 아토피 피부염이 주요 요인으로 분석되었으며, 심리학적 요인으로는 스트레스 인지 수 준, 우울감 경험, 자살 생각 여부, 주관적 수면충족, 주관적 건강상태, 신체활동, 현재 흡연과 음주 경험이 영향요인으로 확인되었다. 또한 사회학적 요인으로는 영양 및 식이 교육, 아침식사 여부, 학업 성적, 주관 적 경제상태, 동거가족 여부가 청소년의 편의식품 섭취 경험에 영향을 미치는 것으로 나타났다. 이러한 결 과를 바탕으로 청소년의 건강한 식습관 관리를 위해서는 실효성 있는 영양 및 식이교육 프로그램 제공과 정서적 지지가 필요하며, 가족 구성원을 교육 대상에 포함시키는 등 다각적이고 체계적인 대책마련이 필요 하다.

This study focused on using indirect filtration through riverbeds to produce high-quality drinking water. Data on water quality from a water intake facility(capacity 10,000 m3/day) and nearby rivers were collected over a three-year period. The average intake facility specifications were found to be a specific surface area of 58 balls/m2, a mean particle size of 24 mm, an inflow velocity of 2.2 cm/sec, and a burial depth of 5 m. The water quality improvement rate was assessed as grade Ia, surpassing the adjacent river’s water quality. Correlation analysis showed a weak correlation between opening ratio, Suspended Solid (SS), and Biochemical Oxygen Demand (BOD) compared to total coliforms and fecal coliforms. The correlation coefficient R value of SS was -0.614, BOD was –0.588, total coliforms -0.870, and fecal coliforms -0.958. The R value shows a negative value, which showed that the larger the opening rate, the lower the removal rate of water pollutants. The correlation coefficient R values according to the depth of burial were found to be BOD 0.914, SS-0.124, total coliforms 1.000, and fecal coliforms 0.866. The deeper the burial depth, the higher the removal rate of BOD and microbial groups.

The labor environment in Korea has changed and problems related to employment types are treated as important issues. Especially, the ratio of irregular workers has not only increased relatively, but the labor conditions in Korea also have worsened in the current years. Studies have reported an association between temporary workers and the prevalence of diseases. However, there is insufficient research on chronic disease and employment types. Methods: The current study examines the prevalence rate of diseases and health behavior by categorizing employment types among Korean adults. Data were obtained from the 2016-2018 Korea National Health and Nutrition Examination Survey. Totally, the data of 2,366 workers (1,239 regular and 1,127 irregular) were analyzed in the study. The types of employment were classified by a questionnaire querying about working conditions. The results showed that irregular workers earned less than regular workers and had a significantly higher prevalence of diabetes mellitus and hypertension. We propose that if discrimination related to working conditions were relieved, irregular workers would be able to invest more time to exercise and doing check-ups regularly. In addition, individual nutrition consultations considering the knowledge and personal environmental factors of each individual are necessary for the improved health of all workers.

The objective of this study is to estimate the dietary exposure of polychlorinated dibenzo-p-dioxins and dibezofurans (PCDD/Fs) of Korean population via milk and meat using a probabilistic exposure assessment model. Total 319 raw milk and meat samples collected in the period 2006-2008 from nationwide Korea were measured the concentrations of 17 PCDD/Fs. Distributions of dietary exposure of 7 age subgroups to PCDD/Fs from the commodities were estimated probabilistically using Monte Carlo simulations. Dietary exposure groups were divided as lower, medium and high consumer subgroups according to the consumption of each commodity. The amounts of dietary exposures of Korean population subgroups were compared to the provisional maximum tolerable monthly intake (PTMI) recommended by the Joint FAO/WHO Expert Committee on Food Additives and Contaminants (JECFA). The mean PCDD/Fs concentrations in raw milk and meat of beef, prok and chicken were measured as 0.501, and 0.022~0.150pg WHO-TEQ/g, respectively. Dietary exposure of children was significantly higher than that of adults due to their high milk consumption per body weight (BW). Dietary intake of PCDD/Fs of the Korean populations estimated ranged from 0.154 to 1.248 pg WHO- TEQ/kg BW/day for high consumers (the 97.5th percentile) at the upper bound. Dietary intakes of average population of various subgroups were below the half of PTMI, but those of higher consumers were found exceeding or comparable to PTMI at the upper bound level. This study also suggests that the estimated PCDD/Fs concentrations in milk and meat are comparable to those reported in previous studies. Probabilistic assessment model for PCDD/Fs exposure in meat and milk commodities could be used to estimate the exposure of PCDD/Fs in Korean population for the development of risk mangement mesaures for PCDD/Fs in meat and milk.

목적 : 본 연구의 목적은 아동의 음식 섭취 시 시각 역할에 관한 연구 동향을 주제범위 문헌고찰 방법으로 확인하고 연구 방향을 설정하는데 기초자료를 제공하고자 하는 것이다. 연구방법 : 본 연구는 주제 범위 고찰을 통하여 1974년부터 2022년까지 국외에서 발표된 연구를 데이터 베이스인 CINAHL, MEDLINE, ProQuest, Science Direct에서 검색하여 본 연구목적에 적합하고 포함 및 제외기준에 해당되는 14개의 연구를 최종으로 선정하였다. 선정된 연구는 연구의 일반적 특성 및 연 구목적, 연구절차, 연구결과로 나누어 분석하였다. 결과 : 음식의 시각적인 요소와 섭취량과의 관련성 연구는 1990~2019년까지 꾸준히 증가하는 것으로 나 타났으며, 미국에서 가장 많은 연구가 이루어졌다. 연구대상자는 아동(2세 8개월~18세)을 대상으로 진 행하였으며, 이 중 유아 및 학령전기 아동만을 대상으로 한 연구가 6편으로 가장 많았다. 음식의 시각적 인 요소는 음식의 색, 모양, 크기로 분류되었으며 2000년대 들어서는 아동이 좋아하는 음식보다는 채소 와 과일과 같은 건강식품으로 시도하는 것으로 나타났다. 14편 중 10편이 해당 음식 섭취량을 증진하기 위한 목적으로 진행되었으며, 음식 섭취를 확인하기 위한 평가는 대부분 아동을 대상으로 대부분 임상 관찰로 진행되었다. 결론 : 본 연구 결과를 통해 음식의 시각적인 요소로는 음식의 색, 모양, 크기로 분류할 수 있었고, 이러한 요소들이 음식 섭취에 영향을 미친다는 것을 확인할 수 있었다.