High Carbohydrate Intake Research Articles

High-Carbohydrate Energy Intake During a Round of Golf-Maintained Blood Glucose Levels, Inhibited Energy Deficiencies, and Prevented Fatigue: A Randomized, Double-Blind, Parallel Group Comparison Study.

This study primarily aimed to examine the optimal amount of carbohydrates in the effects of high-isomaltulose and high-sucrose ingestion compared with low-sucrose ingestion on blood glucose levels. The secondary objective was to assess the changes in blood glucose levels that may impact golf-related performance. This study included 29 healthy male competitive golfers playing 18 holes. These participants were randomly assigned to the low-sucrose (LSUC, 30.9 g/h of carbohydrates), high-sucrose (HSUC, 44.2 g/h of carbohydrates), and high-isomaltulose (HISO, 44.5 g/h of carbohydrates) groups. They were required to continuously consume the test food during the round. Assessment items included blood glucose, golf performance, urinary urea nitrogen, subjective ratings (concentration, fatigue, and relaxation), and anxiety ratings. A main effect of the test meal of changes in interstitial glucose concentration was determined. The HSUC had significantly more interstitial glucose than the HISO and LSUC, while the HISO group had a much lower decrease in urine urea nitrogen than the LSUC group. In subjective fatigue, the main effect of the test diet was observed, and the HSUC and HISO showed significantly lower values than the LSUC after 18 h. Compared with low-carbohydrate intake, high-carbohydrate intake during a round of golf-maintained the blood glucose levels and prevented fatigue. Therefore, this study indicates that competitive golfers need a high-carbohydrate intake of approximately 44 g/h for energy intake during a round of golf.

Association of dietary patterns derived by reduced-rank regression with colorectal cancer risk and mortality.

Unhealthy dietary patterns contribute to an increased risk of colorectal cancer (CRC). Limited prior research has used reduced rank regression (RRR) to assess dietary patterns relative to CRC risk. This study aimed to identify dietary patterns derived by RRR and assess their associations with CRC risk and mortality. We used data from the multicentre Prostate, Lung, Colorectal, and Ovarian Cancer Screening (PLCO) trial. Dietary intake was assessed using a Dietary History Questionnaire. In the RRR intake of fibre, folate, and the percentage of energy from carbohydrates, saturated and unsaturated fatty acids were used as response variables. Cox models and competing risk survival regression, with age as the time scale, were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) for CRC risk and mortality, respectively. The median follow-up time for CRC risk (n = 1044) and mortality (n = 499) was 9.4 years (Interquartile Range: 8. 0, 10.1) and 16.9 years (11.9, 18.6), respectively. Two dietary patterns were identified: the first was characterised by high carbohydrate, folate and low fatty acid intake, and the second by high fibre and unsaturated fatty acid. Compared to participants in the first tertile of the high fibre and unsaturated fatty acid pattern, those in the third tertile had a lower risk of CRC (HR = 0.88; 95% CI: 0.76, 1.03), and colon cancer (HR = 0.85; 95% CI: 0.72, 1.01). Conversely, the high carbohydrate, high folate and low fatty acid pattern had no association with CRC outcomes. None of the dietary patterns showed associations with rectal cancer or CRC mortality. A diet enriched with high fibre and unsaturated fatty acids may reduce the risk of CRC. These results highlight the potential protective effect of adequate fibre intake in conjunction with high consumption of unsaturated fatty acids against CRC.

Does keto make the difference? A comprehensive review of its impact on physical activity, cognitive function and hormonal balance.

Introduction: The ketogenic diet, characterized by high fat and low carbohydrate intake, has become increasingly popular among athletes and fitness enthusiasts due to its potential for supporting weight loss and enhancing metabolic health. This study aims to analyze the impact of the keto diet on physical and cognitive performance, as well as to understand the mechanisms and challenges associated with its use. Materials and methods: A systematic review of available studies was conducted through extensive searches in databases such as PubMed, NCBI, and Google Scholar. State of knowledge: The ketogenic diet can be beneficial in endurance sports by improving fat utilization as an energy source and increasing energy stability, but its impact on aerobic capacity and time to exhaustion varies. In strength sports that require intense effort, carbohydrate restriction can negatively affect strength and muscle mass development, as glycogen is a key energy source in such activities. The ketogenic diet does not provide full benefits in high-intensity sports, such as sprints or team sports, due to limited glycogen availability. The ketogenic diet can improve body composition and metabolic efficiency in athletes, but its impact on performance depends on individual responses, and the adaptation process may involve challenges such as "keto flu." Ketogenic diet may positively impact mental health by reducing symptoms of anxiety and depression. Additionally, it may enhance sleep quality, particularly by supporting deep sleep, and potentially increase testosterone production. Conclusions: The ketogenic diet can benefit endurance sports by improving fat oxidation and sustaining energy levels, though its effectiveness in high-intensity, glycogen-dependent activities is less certain. Strategies like TKD or CKD, along with performance monitoring, can help athletes optimize results.

Application of ketogenic diet in the treatment of diseases

Abstract. The ketogenic diet (KD) has gained recognition for its unique dietary composition that focuses on high fat, low carbohydrate, and moderate protein intake. Originally developed as a treatment for refractory epilepsy, the KD has expanded its applications to address a variety of health conditions, including obesity, diabetes, cancer, and even novel coronavirus pneumonia (COVID-19). This review delves deeply into existing literature to uncover the historical origins of KD, shed light on the complexities of ketogenic metabolism, and summarize the therapeutic benefits of KD in various diseases along with its mechanisms. In addition to exploring the positive aspects of KD, this study meticulously scrutinizes the potential short- and long-term adverse reactions and contraindications associated with the diet. Furthermore, strategic recommendations are proposed to optimize the outcomes of KD therapy. By offering a comprehensive analysis, this review endeavors to furnish valuable theoretical foundations that can elevate the clinical implementation of the KD in medical practice.

The Role of Energy Balance-Related Behaviors (EBRBs) and their Determinants on the Prevalence of Overweight and Obesity in Children in Need, in Greece: A Scoping Review.

There is scarce literature concerning 'children in need' at a European level (including Greece), particularly regarding energy balance-related behaviors (EBRBs) associated with overweight and obesity. This scoping review aimed to synthesize evidence on the EBRBs associated with overweight and obesity among 'children in need' in Greece and their key determinants. Inclusion criteria included children (0-18years) who were 'in need', living with overweight or obesity, residing in Greece, and which included data on EBRBs and their potential determinants. APA PsychInfo, CINAHL, Cochrane CENTRAL, EMBASE, MEDLINE, as well as grey literature (in Greek/English), were searched (without publication date limitations). Data was extracted using an adapted Joanna Briggs Institute tool. Seven studies were identified (n = 141-7,283 participants), highlighting prevalent EBRBs, categorized into groups; nutrition (lower diet quality, poor dietary habits, higher intake of carbohydrates, sugar sweetened beverage consumption, low adherence to the Mediterranean diet pattern, lack of daily breakfast consumption), sleep (low sleep duration), and sedentary behaviors / physical activity (television in children's bedrooms, high screen time, low physical activity, high sedentary time). Key determinants included low parental education, food culture, food preparation by grandmothers, the home environment, parental dietary choices, and lower socioeconomic status, etc. CONCLUSION: This review identified specific EBRBs associated with overweight and obesity affecting children in need in Greece and their determining factors. These findings should guide future research, tailored intervention programs, and public health policies (i.e. the European Child Guarantee Strategy) targeted at this understudied priority population of children in need, in Greece. Review registration number: Open Science Framework: https://osf.io/w7qdu.

CARBOHYDRATE METABOLISM IN BLOOD DONORS

Objective: This study investigates the effects of blood donation on carbohydrate metabolism and examines dietary strategies to support donor health. Blood donation is vital for healthcare but can temporarily disrupt glucose levels, potentially causing symptoms like fatigue and dizziness, particularly in donors susceptible to blood sugar fluctuations. Method: The research integrates a review of WHO guidelines, an analysis of recent studies on carbohydrate metabolism in blood donors, and the development of specific nutritional recommendations to support recovery. The WHO guidelines offer foundational insights into safe donation practices, while scientific research provides data on glucose regulation and recovery needs. Results: Findings reveal that complex carbohydrates before donation stabilize glucose levels, while fast-absorbing carbohydrates after donation rapidly restore energy, reducing symptoms associated with blood sugar dips. Regular donation may also benefit individuals with high carbohydrate intake by regulating glucose levels and reducing disease risks. Novelty: This study uniquely combines WHO recommendations with recent scientific insights to provide a practical, evidence-based dietary framework specifically tailored for blood donors, addressing both donor safety and physiological recovery. This approach emphasizes the importance of carbohydrate type and timing, offering a nuanced perspective for dietary management in donation contexts, and underscores the need for future research on personalized nutrition strategies for optimal donor health.

Relationship between Low Carbohydrate Diet and Postpartum Anxiety and Depression: Iranian Maternal and Child Health Cohort Study

Introduction: Postpartum depression, a form of depression, is a relatively common but serious medical condition that occurs following the birth of a baby. This study aimed to determine the relationship between the carbohydrate diet and the occurrence of anxiety and postpartum depression symptoms in women participating in the initial phase of the Maternal and Child Health Cohort Study, Yazd, Iran. Methods: This study was conducted on the data of 1028 pregnant women from the Yazd Maternal and Child Health Cohort Study. The study tools were food frequency questionnaire (FFQ) and postpartum depression questionnaire. Data related to dietary intake at the beginning of the study were collected in the first visit after pregnancy diagnosis and data related to depression in the second month after delivery. Carbohydrate intake score was calculated for each person according to summing up assigned scores to deciles of percentages of energy from macronutrients. Multivariable logistic regression models were used to estimate the odds ratio (ORs) and 95% confidence interval (CI) of postpartum depression and anxiety across quartiles of low carbohydrate diet scores. Results: Based on the multivariable-adjusted model, there was no significant association between low carbohydrate diet score and odds of postpartum depression (P=0.08). However, multivariable-adjusted model significantly indicated an association between low carbohydrate diet score in second tertile and the odds of postpartum anxiety (P=0.02) (OR: 0.36, 95% CI: 0.15-0.86). Conclusion: After adjusting the confounders, women in the second tertile of low carbohydrate diet score might have 64% lower chance of depression versus those in the first quartile. While low or high carbohydrate intake does not affect postpartum anxiety and depression, moderate carbohydrate intake might be anxiety protective.

Nutritional habits and eating attitude in university students during the last wave of COVID-19 in Spain

Emotional Eating is eating in response to negative emotional states, such as boredom, loneliness, or anxiety. For some young people, both food and alcohol are a source of pleasure in their social life. A cross-sectional study was conducted in 2022-23 in the Health Sciences Faculty. Mediterranean Diet Adherence Test, alcohol use disorders identification test (AUDIT), Emotional Eater Questionnaire (EEQ), Pittsburgh Sleep Quality Index, Yale Food Addiction, Perceived Stress Scale, and Anxiety Questionnaire STAI, were employed. Emotional eater (EE) regarding to no emotional eater (NEE) presented a mild food addiction, a significantly high intake of carbohydrates, fat, and alcohol. Energy intake is dependent on saturated fat, also they are not conscious of their intake of calories, had worse sleep quality, high perceived stress, and worse healthy eating index (HEI) due to their intake of sweets and soft drinks. The diet quality could be affected by the stress of the pandemic. The association of emotional eating with the intake of sweet foods and alcoholic drinks maybe is a remaining situation of COVID-19. We suppose that maladaptive eating behaviors have improved over time during this pandemic. Even though it is necessary to promote healthier eating among university students, it is also necessary to improve healthy habits.

A Culturally Sensitive Mobile App (DiaFriend) to Improve Self-Care in Patients With Type 2 Diabetes: Development Study.

Mobile apps designed with cultural sensitivity have demonstrated higher user acceptability and greater effectiveness in enhancing self-care skills. However, a significant gap exists in developing such apps for specific populations, such as Portuguese Americans living in southern Massachusetts, home to the second-largest Portuguese community in the United States. This group possesses unique cultural traditions, particularly in dietary practices, including a tendency toward high carbohydrate intake. Tailoring diabetes self-care apps to address these specific cultural requirements could substantially improve diabetes management within this population. The aim of this app development project was to develop a prototype diabetes management app for Portuguese Americans with type 2 diabetes mellitus using the design thinking methodology, incorporating user-centered design principles and cultural sensitivity. This paper describes the phase-2 results, focusing on app design and development. Phase 2 of this app development project adhered to the design thinking methodology delineated by the Hasso Plattner Institute of Design at Stanford University, focusing on 2 critical steps: ideation and prototyping. This phase started in March 2022 and continued until April 2024. The project was driven by a multidisciplinary team consisting of 2 nurse educators; an app development specialist; and 2 graduate research assistants from the university's Computer and Information Sciences Department, both well-versed in mobile app development. Data collected during phase 1, which will be published separately, informed the app design and development process. The prototype of the DiaFriend app (version 1) was designed and developed. The app comprises five features: (1) blood glucose monitoring, (2) weight tracking, (3) carbohydrate tracking, (4) exercise log, and (5) medication reminder. The carbohydrate tracking feature was explicitly tailored to correspond to Portuguese food culture. This paper presents the front-end interface flowchart, demonstrating how the user navigates through each screen. It also discusses the challenges faced during the backend development, such as data not being able to be stored and retrieved. The DiaFriend app (version 1) distinguishes itself from conventional diabetes self-care apps through its emphasis on cultural sensitivity. The development of this app underscores the importance of cultural considerations in health informatics. It establishes a foundation for future research in developing and evaluating culturally sensitive mobile health apps. The adaptation of such technologies has the potential to enhance self-care practices among Portuguese Americans with type 2 diabetes mellitus, with improved glycated hemoglobin levels as a potential outcome. The last step of the design thinking methodology, testing the app, will be conducted in phase 3 and the results will be published elsewhere.

Diet and Oral Health: An Investigation Into the Impact of Pakistani Dietary Habits on Oral Disease Prevalence.

Background Dietary habits play a significant role in the rising prevalence of oral health disorders, such as dental caries and periodontal diseases, particularly in regions like Pakistan with distinct dietary customs. Objective The primary objective of this research was to investigate the impact of Asian foodon the prevalence of oral diseases, with a focus on identifying specific dietary factors that contribute to oral health issues. Methodology A cross-sectional study was carried out in Lahore between February and July 2024. The sample consisted of 384 adults aged 18 and above, selected based on specific inclusion and exclusion criteria. Data were collected through structured questionnaires assessing dietary habits and clinical examinations to diagnose oral diseases. Statistical analyses (SPSS version 26: (IBM Corp., Armonk, NY, USA), including correlation, regression, and Chi-Square, were used to evaluate the relationships between dietary patterns and oral health indicators. Results The study revealed significant correlations between dietary habits and oral disease prevalence. Among the 384 patients, 287 (74.74%) patients reported high sugar consumption, with a mean frequency of 3.26 times per week, correlating strongly with oral diseases (r=0.45, p<0.01). This group exhibited 179 patients (46.60%) with dental caries and 153 patients (39.58%) with periodontal conditions. Additionally, 262 patients (68.32%) with high carbohydrate intake, averaging 4.14 times per week, showed a moderate positive correlation with oral disease prevalence (r=0.32, p<0.05). Conversely, 193 patients (50.26%) who consumed fruits and vegetables with a mean frequency of 2.51 times per week demonstrated a significant negative correlation with oral disease prevalence (r=-0.40, p<0.01), indicating a protective effect. High sugar intake was associated with greater severity of oral diseases, with mean severity scores of 3.12 for dental caries and 3.20 for periodontal conditions. Conclusion The results show that although consuming more fruits and vegetables has a preventive effect, traditional Pakistani dietary practices, particularly excessive sugar and carbohydrate consumption, are associated with an increased incidence of oral illness.

Macronutrient Intake during Complementary Feeding in Very Low Birth Weight Infants Comparing Early and Late Introduction of Solid Foods: A Secondary Outcome Analysis.

Background/Objectives: Very low birth weight (VLBW) infants may require enhanced nutrition, even during complementary feeding. However, there are limited data on macronutrient intake during this period, particularly concerning the individual timing of the introduction of solid foods in a representative VLBW infant population. Methods: This prospective observational study analyzed macronutrient intake in VLBW infants with a gestational age < 32 weeks based on whether solid foods were introduced early (<17 weeks corrected age (CA)) or late (≥17 weeks corrected age) Nutritional intake was analyzed using a 24 h recall at 6 weeks CA and 3-day dietary records at 12 weeks, 6, 9, and 12 months CA. Results: In total, 115 infants were assigned to the early and 82 to the late group. The timing of solid food introduction did not affect macronutrient intake, except for a lower fat and higher carbohydrate intake (% of energy) in the early group at 12 weeks and 6 months CA: early vs. late, fat-12 weeks: 47.0% vs. 49.0%, 6 months: 39.2% vs. 43.3%; carbohydrates-12 weeks: 44.9% vs. 43.2%, 6 months: 51.3% vs. 48.0%. Apart from docosahexaenoic acid (DHA) and arachidonic acid (AA), dietary intake recommendations were met in both groups. While nutrient intakes varied significantly between breastfed and formula-fed infants, those with comorbidities exhibited similar nutrient intake levels compared to those without. Conclusions: Our findings suggest adequate macronutrient intakes in VLBW infants irrespective of the timing of solid introduction. However, there is a notable need to enhance dietary intakes of DHA and AA. Future research is crucial to assess whether current nutrient intakes are sufficient for VLBW infants with comorbidities.

An evaluation of sleep quality and nutritional status in nurses with different chronotypes

This study was conducted to investigate the effect of shift work on the sleep quality and nutritional status of nurses with different chronotypes. The study was designed to include 21 people from each chronotype and was completed with 60 participants. The participants were asked to record their food consumption during three different types of shifts they worked over a period of three days. We found that the Pittsburgh Sleep Quality Index (PSQI) score of the evening types was higher than that of the morning types (p < 0.05). The evening types had significantly higher weight, BMI, waist circumference, hip circumference, waist-to-height ratio and neck circumference measurements than the morning types (p < 0.05). The daily energy, fat and SFA intakes of the morning types were significantly higher for those working 16:00–08:00 and 08:00–08:00 compared to those working 08:00–16:00 (p < 0.05). The highest carbohydrate intake was between 08:00–08:00. The amount of carbohydrate, energy and SFA consumed by the intermediate types between 08:00 and 08:00 was significantly higher than that consumed between 08:00 and 16:00. Chronotype and shift hours should also be taken into account when developing nutrition plans for participants who work shifts.

Factors related to elevated serum immunoglobulin G4 (IgG4) levels in a Japanese general population

BackgroundElevated serum immunoglobulin G4 (IgG4) concentrations are one of the characteristic findings in IgG4-related disease (IgG4-RD). This study investigated the frequency of elevated serum IgG4 levels and associated factors in a general Japanese population.MethodsSerum IgG4 concentrations were measured in 1,201 residents of Ishikawa prefecture who underwent general medical examinations. Factors associated with elevated serum IgG4 concentrations were assessed by logistic regression analysis. Participants with elevated serum IgG4 were subjected to secondary examinations.ResultsThe mean serum IgG4 concentration was 44 mg/dL, with 42 (3.5%) participants having elevated serum IgG4 levels. Age- and sex-adjusted logistic regression analyses showed that male sex, older age, and lower intake of lipids and polyunsaturated fatty acids and higher intake of carbohydrates in daily diet were associated with elevated serum IgG4 concentration. Subgroup analyses in men showed that older age, lower estimated glomerular filtration rates based on serum cystatin C (eGFR-cysC) levels, and higher hemoglobin A1c (HbA1c) levels were associated with elevated serum IgG4 concentration. Analyses in women showed that lower intake of lipids and fatty acids and higher intake of carbohydrates were significantly associated with elevated serum IgG4 concentration. One of the 15 participants who underwent secondary examinations was diagnosed with possible IgG4-related retroperitoneal fibrosis.ConclusionsElevated serum IgG4 levels in a Japanese general population were significantly associated with older age, male gender, and dietary intake of nutrients, with some of these factors identical to the epidemiological features of IgG4-RD.

Oral health in obese children common findings, prevention, treatment and outcome

Childhood obesity is a significant global public health issue, closely linked to various oral health challenges, including dental caries, periodontal disease, and malocclusion. Obese children are more prone to these dental problems due to dietary habits that include high sugar and carbohydrate intake, poor oral hygiene practices, and systemic inflammation. This review explores the common oral health issues faced by obese children and emphasizes the importance of preventive strategies and tailored treatment approaches. Preventive measures include promoting healthy dietary habits, improving oral hygiene practices, and ensuring regular dental check-ups. Dietary modifications, such as reducing the intake of sugary snacks and beverages, play a crucial role in preventing tooth decay and other dental problems. Educating children and caregivers about proper brushing and flossing techniques and the use of fluoride toothpaste and dental sealants further supports oral health. Regular dental visits allow for early detection and management of dental issues, with professional cleanings, fluoride treatments, and appropriate restorative and periodontal therapies being integral components of care. The outcomes of these comprehensive treatment strategies are generally positive, leading to improved oral health and overall quality of life for obese children. Multidisciplinary collaboration among healthcare providers, including dentists, pediatricians, and nutritionists, is essential to develop effective care plans that address both obesity and oral health. This integrated approach ensures that obese children receive holistic care that promotes lifelong healthy habits, reducing the risk of future dental and systemic health problems. The review underscores the necessity of a concerted effort to address the intertwined issues of obesity and oral health in children, highlighting the potential for significant health improvements through targeted prevention and treatment strategies.

Energetics of a World-Tour Female Road Cyclist During a Multistage Race (Tour de France Femmes).

Despite the increased popularity of female elite road cycling, research to inform the fueling requirements of these endurance athletes is lacking. In this case study, we report for the first time the energetics of a female world-tour cyclist competing in the 2023 Tour de France Femmes, an 8-day race of the Union Cycliste Internationale. The 29-year-old athlete presented with oligomenorrhea and low T3 before the race. Total daily energy expenditure assessed with the doubly labeled water technique was 7,572kcal/day (∼4.3 physical activity levels), among the highest reported in the literature to date for a female. Crank-based mean maximal power was consistent with female world-tour cyclists (5min, mean 342W, 4.8W/kg; 20min 289W, 4.1W/kg). The average daily energy intake measured with the remote food photography method (Stage Days 1-7) was 5,246kcal and carbohydrate intake was 13.7g/kg (range 9.7-15.9g/kg), and 84g/hr during stages, and an average fat intake of 15% of daily energy intake. An estimated 2,326kcal/day energy deficit was evidenced in a 2.2kg decrease in body mass. Notwithstanding the high carbohydrate intake, the athlete was unable to match the energy requirements of the competition. Despite signs of energy deficiency preexisting (oligomenorrhea and low T3), and other further developing during the race (weight loss), performance was in line with that of other world-tour cyclists and a best personal performance was recorded for the last stage. This case study emphasizes the need for further research to inform energy requirements for female athletes' optimal performance and health.

Impact of a ketogenic diet on intestinal microbiota, cardiometabolic, and glycemic control parameters in patients with Type 2 diabetes mellitus.

Abstract. A ketogenic diet (KD), characterized by high fat and low carbo-hydrate intake, has been proposed as a therapeutic option for Type 2 Diabetes Mellitus (T2DM). One hundred individuals with T2DM were selected and divid-ed into a control group (CG) and an observation (OG) group, with 50 patients in each group, to investigate the effects of a KD on the intestinal flora, Gluca-gon Like Peptide-1 (GLP-1), and HbA1c levels in T2DM patients. Individuals in the CG were given standard treatment and diet, while patients in the OG were given a KD based on the CG. The blood glucose index, blood lipid index, HbA1c, GLP-1 levels, physical examination, and intestinal flora were compared in both groups. The FPG, HbA1c, two h PG, HOMA-IR TG, TC, and LDL -C levels in the two groups were reduced when compared to those before treatment (p&lt;0.05), and the decreases in the OG were more significant than in the CG (p&lt;0.05), while the levels of GLP-1 in the two groups were increased compared to those before treatment, those in the OG were significantly increased when compared to the CG (p&lt;0.05). After treatment, waist circumference, BMI, body mass, and the levels of Enterococcus faecalis (E. faecalis) and Escherichia coli (E. coli) of the two groups were reduced compared to indicators before treatment (p&lt;0.05), and those in the OG were even lower than those in the CG (p&lt;0.05). In conclusion, these findings underscore the KD’s potential to act as an effica-cious dietary strategy in managing T2DM.

Effect of Low vs. High Carbohydrate Intake after Glycogen-Depleting Workout on Subsequent 1500 m Run Performance in High-Level Runners.

Carbohydrate (CHO) metabolism is crucial for short-duration, high-intensity exercise performance, but the effects of variations in glycogen availability have not been investigated in field trials of trained athletes. This study was designed to test how 1500 m time trial (TT) performance is affected by the manipulation of pre-race glycogen reserves. Competitive middle-distance runners (n = 11 (4 females)) completed a 1500 m individually paced indoor TT after abundant (high, >5 g/kg/d) or restricted (low, <1.5 g/kg/d) dietary CHO intake for 2 days after a glycogen-depleting session. Stride pattern, heart rate (HR), capillary blood lactate, and glucose and plasma malondialdehyde (MDA) response were determined. The TT was slower in low vs. high condition by 4.5 (4.5) s (~2%; p < 0.01), with a tendency toward shorter stride length. Blood lactate and glucose were lower before the TT in low vs. high condition (1.8 (0.5) vs. 2.2 (0.7) mmol/L and 5.4 (0.7) vs. 5.9 (0.8) mmol/L, p = 0.022 and 0.007, respectively), and peak lactate was higher in high vs. low condition (16.8 (3.1) vs. 14.5 (4.2) mmol/L, p = 0.039). Plasma MDA was the same before the TT, and 15 min after the TT, it increased similarly by 15% in low (p = 0.032) and high (p = 0.005) conditions. The restriction of pre-test CHO intake impaired 1500 m TT performance and reduced baseline and peak blood lactate concentrations but not blood glucose or MDA response.

Tryptophan supplements in high-carbohydrate diets by improving insulin response and glucose transport through PI3K-AKT-GLUT2 pathways in blunt snout bream (Megalobrama amblycephala)

The aim of this experiment was to elucidate the metabolic ramifications of tryptophan supplementation in the context of high-carbohydrate diet-feeding, which is important for improving feeding strategies in aquaculture in order to improve fish carbohydrate metabolism. Juvenile blunt snout bream with an initial mean body mass of 55.0±0.5 g were allocated to consume one of three experimental diets: CN, a normal diet with carbohydrate content of 30% (w/w); HC, a diet with high carbohydrate content of 43% (w/w); and HL, a high-carbohydrate diet to which 0.8% L-tryptophan (L-trp) had been added. These diets were fed for 8 weeks, and the effects of the carbohydrate and tryptophan contents of the diets were assessed.Histological analysis using Hematoxylin and Eosin (H&E) and Oil Red O staining revealed that high-carbohydrate intake was associated with abnormal hepatocyte morphology and excessive liver lipid accumulation, which were notably ameliorated by tryptophan supplementation. A significant increase in plasma glucose, glucagon, AGEs (advanced glycation end products), triglycerides, total cholesterol, and a significant decrease in insulin and hepatic glycogen after a high-carbohydrate diet in terms of plasma indices, compared to the control group. Almost all of them were restored to the normal level in the HL group. The present study might preliminarily suggest that tryptophan supplementation ameliorates the imbalance in glucose metabolism of this species induced by a high-carbohydrate diet. Transcriptomics showed that glucose metabolism under high carbohydrate was mainly regulated by the PI3K-AKT signaling pathway. The mRNA expression and protein levels of GLUT2 also varied with this pathway, which would suggest that sustained activation of this pathway with the addition of tryptophan accelerates glucose transport and insulin secretion under high-carbohydrate diet. Subsequent GTT and ITT experiments have also demonstrated that tryptophan improves glucose tolerance and insulin tolerance in blunt snout bream on a high-carbohydrate diet.In conclusion, these findings elucidate the positive regulatory effect of tryptophan on the PI3K-AKT-GLUT2 pathway under a high carbohydrate diet and provide a theoretical basis for the subsequent rational application of high carbohydrate diets in the future.

Assessment of Nutritional Practices of Mountain Runners before and during Competitions.

Mountain running, distinct from traditional road running, involves natural trails with significant elevation changes. This study aims to analyze dietary and supplementation practices among advanced and elite Polish mountain runners. Conducted from May to October 2023, this study included 36 participants (13 women, 23 men) aged 21-43 years. A custom questionnaire assessed nutrition two days before and during a competition, focusing on macronutrient intake, hydration, and supplementation. Statistical analyses were performed to compare advanced and elite athletes. Participants consumed an average of 3164.14 kcal two days before and 3176.97 kcal the day before the competition. Carbohydrate intake averaged 7.69 g/kg two days before and 7.64 g/kg the day before the race, potentially insufficient for optimal glycogen stores. Protein intake was adequate, averaging 1.63 g/kg two days before and 1.73 g/kg the day before the race. Fluid intake averaged 2811.25 mL two days before and 2891.80 mL the day before the race. During races, carbohydrate intake averaged 58.56 g/h, with variations based on race duration. Most participants used isotonic drinks and water for hydration. Mountain runners generally adhere to proper nutrition guidelines, with adequate protein and fluid intake. However, their carbohydrate intake may be insufficient for longer races. Higher carbohydrate intake during exercise could provide additional benefits.

A High-Carbohydrate Diet Induces Cognitive Impairment and Promotes Amyloid Burden and Tau Phosphorylation via PI3K/Akt/GSK-3β Pathway in db/db Mice.

Cognitive impairment is a prevalent complication of type 2 diabetes, influenced significantly by various dietary patterns. High-carbohydrate diets (HCDs) are commonly consumed nowadays; however, the specific impact of HCDs on cognitive function in diabetes remains unclear. The objective of this study was to investigate whether an HCD has effects on cognition in diabetes. Eight-week-old diabetic (db/db) mice and wild-type (WT) mice underwent a twelve-week dietary intervention, including a normal diet (ND), an HCD, or a high-fat diet (HFD). Following this, behavioral tests were conducted, and related hippocampal pathology was evaluated. Our results demonstrated that an HCD exacerbated cognitive decline in db/db mice compared to an ND. Additionally, an HCD increased amyloid-β burden and expression of β-site APP cleaving enzyme-1. An HCD was also found to promote the phosphorylation of tau protein via the PI3K/Akt/GSK-3β pathway. Furthermore, an HCD markedly induced neuroinflammation and increased the quantity of microglia and astrocytes. However, these damages induced by an HCD were less severe than those caused by an HFD. Collectively, our findings indicate that a high intake of carbohydrates can have an adverse impact on cognitive function in diabetes.