Annals of Nutrition and Metabolism最新文献

Background: The "first 1,000 days" - the duration of pregnancy and the first 2 years of life - is widely recognized as a sensitive period of early life, with implications for health and developmental outcomes throughout the life course. Optimal nutrition during pregnancy is therefore essential to reduce the risk of adverse pregnancy outcomes and support healthy life trajectories.

Summary: This narrative review summarizes the physiological changes during pregnancy and how these changes affect the energy and nutrient requirements in pregnancy to support maternal, placental, and fetal development and tissue accretion. Recommendations for weight gain and macro- and micronutrient requirements during pregnancy are summarized along with the current evidence.

Background: The importance of preconception care is now widely recognised. Optimisation of the lifestyle, nutrition, and the health of a couple not only affects the chances of conception and a successful pregnancy but also the health of the resulting offspring. Currently, limited data reinforce the importance of further research examining the role of individual nutrients. The complex interactions that these nutrients have with each other and the resultant effect on fertility should also be a focus for future investigation. Modifiable risk factors such as alcohol, caffeine, and body mass index should be optimised prior to attempting to conceive. New research is examining the role of personalised preconception advice.

Summary: This review examines the roles of macronutrients, micronutrients, and lifestyle in fertility and reproductive health. Raising awareness of the importance of the effect of preconception nutrition and lifestyle on hormone balance, gamete development, implantation, and pregnancy should be paramount. This applies to all healthcare professionals who come into contact with people of child-bearing age, as well as the general public.

Introduction: Constitutional thinness (CT) is an uncommon condition, allegedly non-pathological, defined by a persistently low body mass index (BMI <18 kg/m2) enduring from childhood through to later stages of life, without underlying chronic illnesses or hormonal abnormalities. Although CT is not associated with poor health outcomes, its long-term cardiovascular and metabolic implications remain unclear. Given that patients with CT often aim to achieve weight gain, and considering the lack of studies examining the outcomes of high-calorie dietary interventions in this population, we aimed to evaluate vascular and metabolic risk factors associated with atherosclerosis in CT individuals.

Methods: This prospective before-and-after study involved 60 nonsmoking, normotensive, normoglycemic participants with CT, all exhibiting normal lipid profiles (HDL: 55.8 ± 16 mg/dL; LDL: 66 ± 19.9 mg/dL). Changes in carotid intima-media thickness (CIMT), flow-mediated dilation (FMD), fasting, and postprandial blood glucose levels before (T0) and after (T1) a 3-month high-calorie diet intervention was assessed using paired Student's t test. In addition, postprandial insulin levels were evaluated to capture potential metabolic adaptations.

Results: No significant changes were observed in CIMT (p = 0.54), FMD% (p = 0.423), BMI (p = 0.978), fasting (p = 0.297) or postprandial (p = 0.511) glucose levels, or lipid profiles (total cholesterol p = 0.138, HDL p = 0.858, LDL p = 0.66) after the 3-month high-calorie diet intervention. Both CIMT and FMD% remained within normal ranges at baseline and follow-up, suggesting that in the short term, individuals with CT do not experience substantial alterations in vascular or metabolic parameters despite increased caloric intake. A post hoc power analysis based on postprandial insulin (p = 0.007) showed a large effect size (Cohen's d = 0.71), with a power of 82% using G*Power software.

Conclusions: Short-term high-calorie dietary intervention does not lead to significant cardiovascular or metabolic changes in individuals with CT. However, these findings should be interpreted with caution due to the small sample size and short duration. Further studies with longer follow-up and larger sample sizes, or different dietary compositions, may be necessary to evaluate long-term effects.

Introduction: The measurement of water-soluble vitamins is essential to diagnose and monitor various vitamin deficiencies. Establishing stability limits for these vitamins is crucial to ensure accurate laboratory testing. This study aimed to assess the stability of commonly measured water-soluble vitamins under different storage conditions to improve the accuracy of water-soluble vitamins measurement.

Methods: The stability of thiamine, riboflavin, nicotinamide, pantothenic acid, pyridoxic acid and pyridoxal, biotin, 5-methyltetrahydrofolic acid (5-MTHF), and ascorbic acid was measured using liquid chromatography-tandem mass spectrometry. We investigated some pre-analytical factors: the effect of different storage temperatures and times variation between serum and plasma samples, and the impact of ice bath on the sample before centrifugation. We evaluated stability based on differences from the baseline.

Results: Thiamine, pyridoxal, and ascorbic acid in serum exhibited instability at room temperature and 2-8°C. Riboflavin and 5-MTHF in serum were only stable for up to 48 and 72 h at 2-8°C. However, when stored at -20°C, all water-soluble vitamins remained stable for up to 72 h, whereas at -80°C, stability was maintained for up to 7 days. All vitamins in whole blood, except nicotinamide, were stable for up to 2-4 h when stored in an ice bath.

Conclusions: Water-soluble vitamins, such as thiamine, riboflavin, pyridoxal, and ascorbic acid, are unstable at room temperature and 2-8°C. All vitamins were stable for up to 7 days and stored at -80°C. The ice bath improved the stability of whole blood samples before centrifugation. Thus, laboratories should ensure appropriate storage conditions to maintain pre-analytical quality for vitamin measurements.

Introduction: The measurement of water-soluble vitamins is essential to diagnose and monitor various vitamin deficiencies. Establishing stability limits for these vitamins is crucial to ensure accurate laboratory testing. This study aimed to assess the stability of commonly measured water-soluble vitamins under different storage conditions to improve the accuracy of water-soluble vitamins measurement.

Methods: The stability of thiamine, riboflavin, nicotinamide, pantothenic acid, pyridoxic acid and pyridoxal, biotin, 5-methyltetrahydrofolic acid (5-MTHF), and ascorbic acid was measured using liquid chromatography-tandem mass spectrometry. We investigated some pre-analytical factors: the effect of different storage temperatures and times variation between serum and plasma samples, and the impact of ice bath on the sample before centrifugation. We evaluated stability based on differences from the baseline.

Results: Thiamine, pyridoxal, and ascorbic acid in serum exhibited instability at room temperature and 2-8°C. Riboflavin and 5-MTHF in serum were on

Introduction: Vitamin D deficiency is associated with bone metabolism and immune disorders. Radiation's seasonal variation affects vitamin D status more at the poles. In Mexico, near the equator, there have been reports of 10-20% vitamin D deficiency in children. There is no consensus on the definition of vitamin D deficiency, different organizations consider that a vitamin D level should be above 20-30 ng/mL. This study aimed to analyze vitamin D serum concentrations in children and adolescents from Mexico City and the Metropolitan Area (MA) during different seasons.

Methods: Cross-sectional study in children and adolescents aged 5-20 years from Mexico City and Metropolitan Area, from autumn 2016 to winter 2017. Variables of interest such as anthropometric measurements, food consumption, and physical activity were analyzed.

Results: A total of 816 children and adolescents were included. A high frequency of vitamin D deficiency was detected in 40.7% of the sample. The lowest vitamin D status occurred in winter 2016 and winter 2017.

Conclusion: We found a higher frequency of vitamin D deficiency during winter in children and adolescents in Mexico City and MA. This risk persisted after adjusting for age, sex, body mass index Z-score, milk consumption, physical activity, and screen time.

Introduction: Prebiotics are widely used in nutritional supplements, with water-soluble dietary fibers used as thickeners for patients with swallowing difficulties. Interactions between thickeners and medications have been reported; however, the effects of thickeners on warfarin remain unclear. Here, we examined the interaction between warfarin and thickeners through clinical and basic research studies.

Methods: The clinical research study evaluated the effects of combining warfarin and thickeners on blood coagulation, while the basic research study measured the impact of different prebiotics and mixing with gastric and intestinal fluids on warfarin concentration.

Results: The clinical research study showed no significant differences in the patients' prothrombin time-international normalized ratio and Warfarin Sensitivity Index (WSI) before and after the combination. However, the WSI decreased postcombination in half of the patients. Meanwhile, in the basic research study, a concentration-dependent decrease in the residual rate of warfarin was observed with xanthan gum, guar gum, and pectin. When mixed with artificial gastric and intestinal fluids, the residual rate decreased with xanthan and guar gum in gastric fluid and with pectin in intestinal fluid.

Conclusion: Thickeners primarily composed of xanthan gum, guar gum, and pectin may reduce the effectiveness of warfarin due to drug-food interactions.

Introduction: Adverse exposures in utero might cause adaptations of cardiovascular and metabolic organ development, predisposing individuals to an adverse cardio-metabolic risk profile from childhood onwards. We hypothesized that adaptations in metabolic pathways underlie these associations and examined associations of metabolite profiles at birth with childhood cardio-metabolic risk factors.

Methods: The study included 763 mother-child pairs participating in an ongoing population-based prospective cohort study with an overall low disease risk. Cord blood serum concentrations of amino acids (AAs), nonesterified fatty acids, phospholipids and carnitines (Carn) were obtained using a liquid chromatography coupled with tandem mass-spectrometry. We measured android/gynoid fat mass ratio, blood pressure, insulin, and lipid concentrations at the children's age of 5.9 (0.3) and 9.8 (0.9) years.

Results: We did not observe associations of cord blood metabolites with systolic or diastolic blood pressure, insulin, triglycerides, and android/gynoid fat mass ratio at both ages and cardio-metabolic risk clustering at age 10 years. Five short- and medium-chain Carn.a metabolites were positively associated with cardio-metabolic risk clustering at age 6 but did not survive more stringent confounder adjustment.

Conclusion: No consistent associations between cord blood metabolites and cardiovascular risk factors at school age were observed.

Introduction: In the principles of intensive care, nutritional support is an important part of critical care. This study was conducted to evaluate the adequacy of enteral nutrition in patients hospitalised in adult intensive care units.

Methods: The present study was designed as a cross-sectional study, and it was carried out on 124 patients who received enteral nutrition in the adult intensive care unit of a training and research hospital between March 1, 2022, and April 1, 2022. Patients who received parenteral nutrition during the 1-month follow-up were excluded from the study. The study used the enteral nutrition information form and the baseline NRS-2002 score. Energy needs of patients were calculated by Schofield method and addition of stress factors. Daily energy intake was recorded for each patient every day during hospitalisation. Backward stepwise logistic regression analysis, Shapiro-Wilk, Student's t, Mann-Whitney U, Kruskal-Wallis, Dunn-Bonferroni, Pearson chi-squared, and Fisher's exact tests were used to evaluate the data.

Results: Mean age of the patients was 70.9 ± 16.7 years (range 21-98), and 58.9% were male. The mean baseline NRS-2002 score was 5.88 ± 1.23. Enteral nutrition started an average of 2.4 ± 2.2 days (range 0-18) after ICU hospitalisation. The mean target energy intake according to Schofield method was 1,772.9 ± 284.3 kcal, while the actual intake was 1,463.5 ± 386.2 kcal. Only 37.1% of patients achieved the target dose, taking an average of 4.5 ± 4.2 days (1-20) to reach it. In 25% of patients, feeding was interrupted due to residual volumes exceeding 500 mL, with 54.8% of these receiving hypercaloric products. Patients with neurological and cardiac diagnoses had significantly higher rates of reaching the target dose (p = 0.001), while those with interruptions due to high residual volumes had lower rates (p = 0.003). Finally, the overall mortality rate was 59.7%.

Conclusion: More than half of the patients did not meet the goals set for enteral nutrition therapy. A lower baseline NRS-2002 score and low energy requirements facilitated goal attainment. Patients with cardiac or neurological conditions were more likely to reach the target nutritional dose. However, those fed with hypercaloric products experienced more interruptions due to excess residue and achieved the nutritional target less frequently.

Introduction: Candidates for bariatric surgery may have psychiatric disorders that must be evaluated. The aim of this study was to describe the psychological state and quality of life (QoL) of patients with obesity awaiting bariatric surgery prior to surgical procedure and 1 year after surgery.

Methods: A longitudinal retrospective observational study was carried out in 71 patients awaiting bariatric surgery. Anthropometric data were collected, and the following were evaluated before and 1 year after the intervention: 44 patients were evaluated to rule out personality disorder, using the Salamanca Questionnaire of Personality Disorders; eating disorder, with the Bulimia Test of Edinburgh (BITE); depression, using the Beck Depression Inventory (BDI); and 71 patients were evaluated QoL, with the "36-Item Short Form Health Survey" (SF-36).

Results: A total of 34.1% (n = 15) of patients presented personality disorder (group B most frequent). A total of 31.8% (n = 14) obtained scores suggesting anomalous food behavior (6.8%, n = 3 severe). According to the BDI, 43.2% (n = 19) showed low mood prior to the intervention. Lower scores were obtained when evaluating QoL for physical functioning (physical function: 56.81 ± 24.9; physical problems: 66.76 ± 37.64). One year after the intervention, QoL improved in those patients who underwent the sleeve gastrectomy (SG).

Conclusions: Patients with bariatric surgery more frequently presented with type B and C personalities. One year after bariatric surgery, an improvement in QoL test was observed. Patients who underwent SG technique showed better mean scores than those after biliopancreatic diversion.