Ablation of Akt2 and AMPKα2 rescues high fat diet-induced obesity and hepatic steatosis through Parkin-mediated mitophagy

@#Given the opposing effects of Akt and AMP-activated protein kinase (AMPK) on metabolic homeostasis, this study examined the effects of deletion of Akt2 and AMPKα2 on fat diet-induced hepatic steatosis. Akt2–Ampkα2 double knockout (DKO) mice were placed on high fat diet for 5 months. Glucose metabolism, energy homeostasis, cardiac function, lipid accumulation, and hepatic steatosis were examined. DKO mice were lean without anthropometric defects. High fat intake led to adiposity and decreased respiratory exchange ratio (RER) in wild-type (WT) mice, which were ablated in DKO but not Akt2−/− and Ampkα2−/− mice. High fat intake increased blood and hepatic triglycerides and cholesterol, promoted hepatic steatosis and injury in WT mice. These effects were eliminated in DKO but not Akt2−/− and Ampkα2−/− mice. Fat diet promoted fat accumulation, and enlarged adipocyte size, the effect was negated in DKO mice. Fat intake elevated fatty acid synthase (FAS), carbohydrate-responsive element-binding protein (CHREBP), sterol regulatory element-binding protein 1 (SREBP1), peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α), peroxisome proliferator-activated receptor-α (PPARα), PPARγ, stearoyl-CoA desaturase 1 (SCD-1), phosphoenolpyruvate carboxykinase (PEPCK), glucose 6-phosphatase (G6Pase), and diglyceride O-acyltransferase 1 (DGAT1), the effect was absent in DKO but not Akt2−/− and Ampkα2−/− mice. Fat diet dampened mitophagy, promoted inflammation and phosphorylation of forkhead box protein O1 (FoxO1) and AMPKα1 (Ser485), the effects were eradicated by DKO. Deletion of Parkin effectively nullified DKO-induced metabolic benefits against high fat intake. Liver samples from obese humans displayed lowered microtubule-associated proteins 1A/1B light chain 3B (LC3B), Pink1, Parkin, as well as enhanced phosphorylation of Akt, AMPK (Ser485), and FoxO1, which were consolidated by RNA sequencing (RNAseq) and mass spectrometry analyses from rodent and human livers. These data suggest that concurrent deletion of Akt2 and AMPKα2 offers resilience to fat diet-induced obesity and hepatic steatosis, possibly through preservation of Parkin-mediated mitophagy and lipid metabolism.

Intraocular Pressure: the Effect of Short-term Fasting and Its Association With Fluid and Fat Status

@#Introduction: Short-term fasting may influence intraocular pressure (IOP) due to alteration of fluid (total body water; TBW, and water intake) and fat (total body fat; TBF). This study aimed: i) to compare IOP values within and between, fasting and non-fasting periods; and ii) to assess the association between IOP and, TBW and TBF. Methods: Thirty healthy participants aged 21.8±1.1 years were assessed on two different periods (fasting vs. non-fasting). During each period, the IOP, TBW and TBF values were assessed for four times (morning, afternoon, evening, late-evening). The IOP was measured using AccuPen® tonopen, while TBW and TBF were assessed by using a Tanita body composition analyser. Results: During fasting, the IOP value in the afternoon (14.53±2.33 mmHg) was significantly higher than in the evening (12.43±2.73 mmHg, p=0.009) and late-evening (12.60±2.44 mmHg, p=0.003). No significant difference in IOP was observed during non-fasting period. The mean of IOP in the evening was significantly lower during fasting compared to non-fasting (12.43±2.73 mmHg vs 13.75±2.53 mmHg, p=0.044). The IOP and TBW were negatively correlated (r=-0.268; p=0.011) during non-fasting and showed no association during fasting period. There was no significant correlation between IOP and TBF during both fasting and non-fasting periods. Conclusion: IOP reduction during short-term fasting, together with the no association with TBF and TBW suggested that IOP is an independent factor that reduces during fasting in healthy population.

Association between carbohydrate and fat intake and estradiol levels with body fat percentage in Minangkabau ethnic premenopausal women, in Padang City West Sumatra year 2018

Background: Excessive carbohydrate and fat intake with excess estradiol levels will cause an increase in body fat percentage, thus causing obesity in premenopausal women. Objective was to determine the association between carbohydrate intake with fat percentage, the association between fat intake with fat percentage, the association between SAFA intake with fat percentage, the association between MUFA intake with fat percentage, the association between PUFA intake with fat percentage, and the association between estradiol levels with fat percentage in Minangkabau ethnic premenopausal women in Padang City, West Sumatra.Methods: This research was carried out in Padang City. Research conducted was observational research with cross sectional research design. Subjects in this research were 52 people. Variables in body fat percentage were measured using Bioelectrical Impedance Analysis (BIA), carbohydrate and fat intake data were obtained by interviewing the Food Frequency Questionnaire (FFQ), and estradiol levels were examined by ELISA. Data analysis was performed using Pearson correlation test.Results: In premenopausal women in the city of Padang, low carbohydrate intake was found with an average of 227.25grams, high fat intake was found with an average of 77.84grams, high SAFA intake was found with an average of 27.59grams, low MUFA intake was found with an average of 9.91grams, normal PUFA intake was found with an average of 9.37grams, normal estradiol levels was found with an average of 145.95pg/ml, and more fat percentage was found with an average of 33.31.Conclusions: There was an association between carbohydrate intake with fat percentage, there was an association between fat intake with fat percentage, there was an association between SAFA intake with fat percentage, there was an association between MUFA intake with fat percentage, there was an association between PUFA intake with fat percentage, and no association between estradiol levels with of fat percentage in premenopausal women in Padang City.

Fatty acid intake in relation to reproductive hormones and testicular volume among young healthy men / 亚洲男科学杂志(英文版)

Emerging evidence suggests that dietary fats may influence testicular function. However, most of the published literature on this field has used semen quality parameters as the only proxy for testicular function. We examined the association of fat intake with circulating reproductive hormone levels and testicular volume among healthy young Spanish men. This is a cross-sectional study among 209 healthy male volunteers conducted between October 2010 and November 2011 in Murcia Region of Spain. Participants completed questionnaires on lifestyle, diet, and smoking, and each underwent a physical examination, and provided a blood sample. Linear regression was used to examine the association between each fatty acid type and reproductive hormone levels and testicular volumes. Monounsaturated fatty acids intake was inversely associated with serum blood levels of calculated free testosterone, total testosterone, and inhibin B. A positive association was observed between the intake of polyunsaturated fatty acids, particularly of omega-6 polyunsaturated fatty acids, and luteinizing hormone concentrations. In addition, the intake of trans fatty acids was associated with lower total testosterone and calculated free testosterone concentrations (P trend = 0.01 and 0.02, respectively). The intake of omega-3 polyunsaturated fatty acids was positively related to testicular volume while the intake of omega-6 polyunsaturated fatty acids and trans fatty acids was inversely related to testicular volume. These data suggest that fat intake, and particularly intake of omega 3, omega 6, and trans fatty acids, may influence testicular function.

Carbohydrate Intake Exhibited a Positive Association with the Risk of Metabolic Syndrome in Both Semi-Quantitative Food Frequency Questionnaires and 24-Hour Recall in Women

We compared the usual nutrient intake in both the semi-quantitative food frequency questionnaire (SQFFQ) and 24-hour recall methods and determined the association between metabolic syndrome (MetS) risk and nutrient intake calculated by both methods in Korea National Health and Nutrition Examination Survey (KNHANES; 2012–2014) data. Adjusted odds ratios for MetS were calculated according to the intake of macronutrients, measured by the 2 methods in 10,286 adults, while controlling for covariates associated with MetS. Fat and carbohydrate intake (energy percent) calculated by 24-hour recall and SQFFQ was significantly different between the MetS and non-MetS groups, particularly in women. The differences in other nutrient intakes determined by both methods were mainly non-significant. The correlation coefficients between the 2 methods were about 0.4 for most nutrients except total vitamin A and iron (Fe). Energy intake according to gender and MetS presence was similar between the 2 methods. Carbohydrate intake exhibited a positive association with the MetS risk, while fat intake showed a negative association in both methods. The association exhibited a gender interaction with carbohydrate and fat intake calculated by 24-hour recall: women exhibited a significant association. However, for the SQFFQ a gender interaction was evident only for carbohydrate intake. In diet quality index of SQFFQ the adequacy of vegetables and total fat intake was higher in the non-MetS than the MetS. In conclusion, the MetS prevalence exhibited a positive association with carbohydrate intake only in women, as assessed by 24-hour recall and SQFFQ. The SQFFQ can be used to assess the association between usual food intake and MetS risk in large population studies.

Associations of Obesity and Dyslipidemia with Intake of Sodium, Fat, and Sugar among Koreans: a Qualitative Systematic Review

A qualitative systematic review was performed to identify associations of obesity and dyslipidemia with intake of sodium, fat, and sugar among Koreans. We reviewed 6 Korean research databases (KMbase, KoreaMed, NDSL, DBpia, RISS, KISS) with the keywords “sodium intake,”“fat intake,” and “sugar intake.” Total of 11 studies were investigated in this present study. Of these articles, 7 studies were related to sodium intake, 2 studies had a relation to fat intake, and 2 studies were associated with sugar intake. We indicated general characteristics, concentration of serum lipids, nutrition intake, and statistically significant results. High sodium intake contributed to increased etiology of hypertriglyceridemia, high-density lipoprotein (HDL) hypocholesterolemia, and a risk of being overweight. Fat intake was significantly associated with body fat, low-density lipoprotein (LDL) hypercholesterolemia, and HDL hypocholesterolemia. Sugar intake from coffee drinks and sugar-sweetened beverages contributed to increased HDL hypocholesterolemia and continuous metabolic syndrome score. This qualitative review among Koreans represented that intake of sodium, fat, and sugar has a positive relationship with cause of obesity-related diseases. Especially, this present study has a great significance in terms of considered study that intake of the potentially hazardous nutrients among Koreans has an association with obesity and dyslipidemia. However, further studies such as randomized controlled trials on associations between sodium, fat, and sugar and obesity and dyslipidemia need to be continuously required in order to conduct quantitative systematic reviews and a meta-analysis for Koreans.

Comparison of the lipids levels, C-reactive protein and adiponectin in adolescent male by fat intake

The purpose of this study was to investigate the relationship between dietary fat intake, anthropometric data, blood lipids, C-reactive protein, and adiponectin in Korean male college students. Forty-eight subjects were divided into 2 groups based on dietary fat intake: UERF (under 30% of energy ratio for fat source), AERF (above 30% of energy ratio for fat souce). We collected dietary intake data using 24-hour dietary recall for 3 days. Anthropometric and biochemical parameters were measured by using standard methods. Segmental body composition analysis was carried out using an 8-electrode multifrequency bioelectrical impedance method of body fat estimation. There was no significant difference in anthropometric data and serum lipid profile between UERF and AERF group. Serum C-reactive protein level was significantly higher in the AERF group compared to the UERF group. Although there was no significant difference in serum adiponectin level between UERF and AERF groups, subjects had lower adiponectin levels. Correlation data show that serum adiponectin level was positively correlated with vegetable intake (p < 0.05). In addition, dietary fat intake had a positive correlation with meat (p < 0.01), whereas a negative correlation with grain (p < 0.01), vegetables (p < 0.05), and fish (p < 0.05). These results suggest that the increased fat intake of non-obese Korean male college students is associated with their increased serum C-reactive protein concentration. Therefore, proper guidelines on fat intake and nutrition education are necessary for the prevention and management of metabolic syndromes.

Lifestyle Habits Related to Abdominal Obesity in Korean Adolescents / 가정의학회지

BACKGROUND: It has been reported that the abdominal obesity can cause various metabolic abnormalities not only in adults but also in adolescents. This study was conducted to investigate lifestyle habits related to abdominal obesity in Korean adolescents. METHODS: This study is a cross-sectional study on 561 adolescents (305 boys and 256 girls) aged 12-18 years from the Korean National Health and Nutrition Examination Survey 2005. The abdominal obesity was defined as waist circumference at or above the 90th percentile for each age and gender based on the 2007 growth chart for Korean children. The frequency of physical activity, screen time, and the intake amount of energy and macronutrients were investigated as lifestyle habits. RESULTS: The prevalence of abdominal obesity in Korean adolescents aged 12-18 years was 9.1% (Boys, 9.4%; Girls, 8.7%). The mean of daily screen time was 4.3 +/- 0.1 hours (Boys, 4.4 +/- 0.2 hours; Girls, 4.2 +/- 0.2 hours). The subjects with daily screen time > or = 5 hours had a 3.0 times increased risk of abdominal obesity compared to subjects with daily screen time or = 35% of energy was 2.57 (95% confidence interval, 1.16 to 5.68; P-value = 0.020) with fat intake < 25% of energy as reference. The relationship between long screen time and abdominal obesity was observed in girls and high fat intake was related to abdominal obesity in boys. CONCLUSION: This study shows that abdominal obesity in Korean adolescents is associated to long screen time and high fat intake.

Relation of Dietary Fat Intake Perception to Nutritional Status and Psychosocial Factors

Excess dietary fat intake is associated with many chronic diseases. This crosssectional study determines the differences in nutritional status and diet-related psychosocial factors by accuracy levels of dietary fat intake perceptions among adults. A total of 202 Universiti Putra Malaysia staff (20-55 years old) volunteered to participate in the study. Dietary fat accuracy levels (under-estimate, accurate and over-estimate) were determined by assessing actual fat intake through 24-hour diet recall and self-rated fat intake. Diet-related psychosocial factors assessed were perceived risks, intention to change, outcome expectancies and perceived barriers. About half (49.5%) of the respondents were classified as accurate estimators, while 35.6% and 14.9% were under-estimators and over-estimators, respectively. Dietary fat intake differed significantly between the dietary fat accuracy groups with under-estimators having the highest amount of dietary fat intake (F=17.10; p<0.001) and percentage of fat calories (F=103.99 + 0.533%, p<0.001). Over-estimators had the highest mean BMI (F=3.11, p<0.05) compared to other groups. Among the fat accuracy groups, under-estimators reported the least barriers to eating low fat foods (F= 3.671, p<0.05). There were no significant differences in waist circumference, energy intake, perceived disease risks, intention to change and outcome expectancies among the dietary fat accuracy groups. These findings suggest that inaccurate perceptions of dietary fat intake should not be overlooked as one of the cognitive barriers to dietary change and factors that influence nutritional status among adults.

Development of Contents and Textbooks for the Education to Reduce Elementary Students' Fat Intake / 대한지역사회영양학회지

This study was conducted to reduce children's fat intake and to establish healthy dietary lifestyles. To achieve these goals, we searched, collected, and analyzed the materials related to the fat education, based on which the research personnel-professors and graduate students in nutrition and child education and elementary school teachers- discussed to figure out major topics, objectives, and detailed contents and activities appropriate for fat intake reduction. We also organized an advisory committee composed of 15 professionals in related fields to discuss the adequacy and validity of the specific contents. Finally, we systematically organized the contents and developed children's textbooks and teacher's guidebooks. Considering the different cognitive development stages of junior and senior elementary students we developed two different textbooks for each of them which are easy to read and understand, fun to play with lots of activities, and designed to practice into daily life. The contents cover three major topics-the concept of lipid, lipid in food, lipid in life and are composed of 6 units in total. To help teachers understand and and to instruct, teacher's guidebooks contain an overview of the education, specific information and practical guidelines for each class. We developed these education materials with the aim of lowering children's fat consumption and eventually promoting their health welfare; hopefully we expect these materials would be useful for children's nutritional education in the field.

Relationship between plasma lipid profile and the severity of diabetic retinopathy in type 2 diabetes patients.

This study aimed to determine the relationship between plasma lipid profile and the severity of diabetic retinopathy in type 2 diabetes patients. A cross sectional study was done in Ophthalmologic Clinic, Cipto Mangunkusumo General Hospital, Jakarta for 52 diabetic retinopathy (DR) patients. Data collected were demographic, life style, duration of diabetes, physical and antropometric examinations, fat, fatty acid and cholesterol intake, fasting plasma glucose, A1C, total-, LDL-,HDL-cholesterol and triglyceride level, and fundus examination. Statistical analysis was done using chi-square test to see the associations between plasma lipid profile and DR in type 2 diabetes patients. Subjects comprised of 20 males and 32 females diabetes patients with mean age of 53.8 ± 5.2 years. As much as 53.8% had been diagnosed as DM for >10 years. The mean value of BMI was 24.1 ± 3.3 kg/m2 and 38.5% were classified as obese I and II. The mean value of fasting plasma glucose was 157.5 ± 71.8 mg/dL, and A1C was 9.1 ± 2.4 %. For lipid profile, 40.4% had high total cholesterol level (>240 mg/dL), 34.6% had high and very high LDL-cholesterol level (≥160 mg/dL), and 65.4% had normal HDL-cholesterol (40-60 mg/dL) and triglyceride level (<150 mg/dL). For the severity of retinopathy, 61.6% had severe non-proliferative diabetic retinopahy (NPDR) and proliferative diabetic retinopahy (PDR). In conclusion, there were no significant associations between plasma lipid profile and the severity of diabetic retinopathy.

Hábitos de alimentación e ingestión de calorías en un grupo de niños y adolescentes obesos / Dietary habits and calories intake of overweight and non overweight children and adolescents

Introducción. Objetivo: comparar los hábitos alimentarios y consumo de energía en niños y adolescentes obesos y no obesos. Material y métodos. Estudio transversal analítico en 71 sujetos obesos (índice de masa corporal [IMC] > centila 95) y 75 no obesos (IMC centilas 5 a 85) de 5 a 15 años de edad (promedio 9.8). Se realizaron encuestas alimentarias por recordatorio de 24 horas. Se calcularon: consumo de energía, macronutrimentos y alimentos de consumo común. Resultados. El consumo de energía y grasas fue mayor en niños obesos (P < 0.001). Los 5 alimentos referidos más frecuentemente fueron: leche, tortillas, frijoles, refrescos y agua de frutas. Los productos chatarra fueron referidos más frecuentemente que frutas y verduras. Conclusiones. El consumo de energía en niños obesos fue superior al de no obesos, lo que puede explicar la presencia de obesidad. Es preocupante el consumo frecuente de refrescos y productos chatarra. La obesidad se debe prevenir a través de la educación y fomento de hábitos de alimentación y estilos de vida saludables.

Introduction. Objective. To compare the dietary habits/energy intake of overweight and non-overweight children and adolescents. Material and methods. A cross-sectional 24-hour dietary recall study was conducted of 71 overweight (body mass index > 95th percentile) and 75 non-overweight children and adolescents ages 5 to 15 years (mean 9.8 ± 2.8). Energy and nutrient intake were calculated and foods most frequently eaten were identified. Results. Overweight children consumed more total kilocalories and fats (P < 0.001). The 5 top foods consumed were milk, corn tortillas, beans, sodas and fruit water in both groups. Junk food was consumed more frequent than fruits and vegetables. Conclusions. Energy intake was higher in obese children and adolescents, and can be related with the presence of obesity. It is worrisome that sodas were among the most frequently consumed food items. Obesity should be prevented by promoting healthy food habits and lifestyle.

Comparison of Energy Nutrient and Fat Intake between the Hypertensive and Normotensive Male Workers / 대한산업의학회지

OBJECTIVES: The purpose of this study was to investigate the difference in nutrient intake between normotensive workers and hypertensive workers to obtain basic data for developing a program of effective hypertension care at work. METHODS: The subjects were 338 male workers. We measured physical data by medical examination and collected lifestyle data by questionnaire survey. Dietary intakes were collected using a food frequency questionnaire. We classified the subjects into normal, prehypertension, and hypertension groups, and compared the results of age, body mass index (BMI), blood pressure (BP), lifestyles and energy nutrients and lipids intake. RESULTS: There were significant differences in both weight and BMI between the hypertension group and the other two groups (p<0.05). The smoking levels of the prehypertension group and hypertension group were significantly higher than that of the normal group (p<0.05). The three groups also showed significant differences in drinking amount (p<0.05). There were significant differences in carbohydrate and protein intakes and the ratio of carbohydrate, protein, and fat intake (p<0.05). CONCLUSION: In this study, there was a significant difference in carbohydrate intake between normotensive and hypertensive workers, and the intake of energy nutrients and fatty acids in the prehypertension group and hypertension groups was unbalanced. Therefore, early diagnosis of workers with hypertension and prehypertension is necessary to improve lifestyles particularly food habit.

Intake of Dietary Fat and Vitamin in Relation to Breast Cancer Risk in Korean Women: A Case-Control Study

To investigate association between breast cancer risk and nutrients intake in Korean women, a case-control study was carried out, at Seoul, Korea. Incident cases (n=224) were identified through the cancer biopsy between February 1999 and December 2000 at two University hospitals in Seoul. Hospital-based controls (n=250) were selected from patients in the same hospitals, during the same periods. Food intake was investigated semiquantitative frequency questionnaire (98 items) by trained dietitian. Subjects were asked to indicate the average food intake and vitamin supplement for a 12 months period of 3-yr prior to the base-line phase. In investigation of vitamin supplement use, subjects were asked the average frequency of use, duration, dose and the brand name of vitamin supplement (multivitamins, vitamin A, vitamin C and vitamin E). And nutrients were calorie adjusted by the residuals method. In this study, higher breast cancer risk incidence was not observed with higher intake of total fat and saturated fatty acids, however statistically significant trends with breast cancer incidence for total saturated fatty acids were found (p trend =0.0458). In analyses of vitamins, beta-carotene and vitamin C were significantly associated with decreasing risk of breast cancer. In analyses, results from dietary plus supplement of vitamin was not associated with breast cancer risk in this study. In conclusion, our findings suggest that antioxidant vitamins such as beta-carotene and vitamin C intake could lower the breast cancer risk in Korean women.

Analysis on the Stages of Change in Fat Reducing Behavior and Social Psychological Correlates in adult Female / 대한지역사회영양학회지

Under the assumption that people go through stages in making dietary behavior change, this study was attempted to apply the stages of a change model for fat intake by examining the associations of social psychological variables with stages of change in dietary fat reduction. Derived from social psychological theories, 10 social psychological variables on motivational beliefs(6), social influence(3) and self-efficacy(1) related specifically to selecting every day diets low in fat were constructed. Fat and energy intakes were assessed by a short form semi-quantitative food frequency questionnaire. The associations of stages of change with motivational beliefs, social influence, and self-efficacy variables and energy and fat intakes were assessed in 333 female adults from large cities in Korea. Dietary stage groups differed significantly on most of the social psychological variables in ways predicted by theory. Motivational factors that lead to a psychological state of readiness to take action were important in the early stages of the dietary change process. Social influences were more important in the stages as people decide to take action. Self efficacy and motivational beliefs, particularly, reduction of perceived barriers were important in maintaining fat reduction behavior. The results of our study indicate differences in stages of change in fat reduction behavior in terms of nutrient intakes and social psychological correlates and suggests that adding a time dimension to social psychological models increases our understanding of dietary change, which assist us in designing nutrition education interventions that are more appropriately targeted by stage of change.

Relationship of serum lipid profile and the degree of depressive symptoms in Korean adults

BACKGROUND: An inverse relationship between cholesterol level and the degree of depressive symptoms was found in several studies targeted to Westerners. But, other studies failed to replicate this finding, giving diverse opinion on this matter. The objective of this study was to investigate the association between the degree of depressive symptomps and lipid level, total calorie intake and fat intake respectively in adults screened in a health promotion center in Korea. METHOD: The study group consisted of 352 men and women who visited the Health Promotion Center of Seoul National University Hospital from June to August in 1998. Their depressive symptoms were measured by Korean version of the Center for Epidemiologic Studies Depression Scale(CES-D). Lipid level was measured by enzymatic methods with fasting blood specimen. Total calorie and fat intake were calculated from a self-reported questionnaire on the types and amount of food. RESULTS: Depressive symptoms were not significantly related to lipid levels, total calorie intake, fat intake, age, exercise, BMI, smoking or alcohol consumption(p>0.05). But sex(P0.05). CONCLUSION: In contrast to the results of previous studies, no significant association between the degree of depressive symptoms and lipid levels, total calorie intake and fat intake respectively were found in Korean adults after adjusting for several factors related to health.