Search Results (161)

Background: While combined diet and physical activity interventions are recommended, evidence specific to low-risk pregnant women remains limited. As responses to combined interventions may vary by pre-pregnancy BMI, maternal health status and pregnancy outcomes, targeted evaluation in low-risk pregnant women is needed. Inconsistencies across studies, along with the lack of a comprehensive synthesis of both effects and intervention components, further limit their implementation. Objective: Our aims were to assess the effects of combined diet and physical activity interventions on gestational weight gain among low-risk women and to systematically characterize the intervention components. Design: We conducted a systematic review and meta-analysis following the Cochrane Handbook guidelines and PRISMA 2020. Methods: Eight databases and trial registries were searched from inception to 16 March 2026. Two reviewers independently conducted study selection, data extraction and risk of bias assessment. Intervention components were coded using the TIDieR checklist. The quality of included studies was assessed using the updated Cochrane risk of bias 2.0 tool. Meta-analyses were performed using Review Manager 5.4, and certainty of evidence was assessed using the GRADEpro online tool. Results: A total of 10 studies involving 3977 pregnant women were included. Combined diet and physical activity interventions significantly reduced total gestational weight gain (GWG) (MD = −0.78 kg, 95% CI: −1.12 to −0.44, p < 0.00001) and the risk of excessive gestational weight gain (EGWG) (OR = 0.63, 95% CI: 0.49–0.81, p = 0.0003). Additionally, individually delivered physical activity components and those implemented in healthcare facilities appeared to be associated with lower total GWG (MD = −0.76 kg, 95% CI: −0.98 to −0.53, p < 0.00001). For EGWG, lower risk was observed in interventions using combined face-to-face and remote formats (OR = 0.54, 95% CI: 0.41–0.72, p < 0.0001) and moderate frequency (diet: OR = 0.64, 95% CI: 0.51–0.81, p = 0.0002, physical activity: OR = 0.65, 95% CI: 0.52–0.83, p = 0.0004). Conclusions: Combined diet and physical activity interventions were associated with reduced total GWG and lower EGWG risk in low-risk pregnant women. Intervention characteristics, such as individual delivery formats, combined face-to-face and remote formats, moderate frequency and implementation in healthcare facilities, may be related to intervention effectiveness. Registration number: CRD420251013116 (PROSPERO). Full article

Gestational weight gain (GWG) and birth weight (BW) have a multifactorial etiology, which makes identifying the most influential determinants difficult. The association between variants of the FTO and LEPR genes has been explored as contributing factors to obesity in various age groups; however, their role in GWG and BW in adolescent mothers and their offspring is uncertain. To determine whether the presence of polymorphisms rs9939609 (FTO) and rs1137101 (LEPR) is associated with gestational weight gain and newborn weight in a cohort of adolescent mothers. Methods: A prospective cohort study of 305 mother-child dyads was conducted between 2020 and 2024. Genotyping of the single nucleotide variants (SNVs) rs9939609 of the FTO gene and rs1137101 of the LEPR gene was performed using real-time PCR and high-resolution melting analysis (qPCR-HRM), using maternal peripheral blood and umbilical cord blood samples. GWG, BW, energy intake, and other perinatal data were recorded and classified. Genetic data from 305 mother–offspring dyads were analyzed. The median maternal age was 16 years, and 71.4% had a normal pre-pregnancy body mass index (BMI). The most frequent genotypes were TT for FTO rs9939609 and AG for LEPR rs1137101. In both groups, the genotypic distribution significantly deviated from Hardy–Weinberg equilibrium (p < 0.0001). The AA genotype of FTO was associated with a higher probability of excessive gestational weight gain (GWG) after adjustment for pre-pregnancy BMI and dietary and sociodemographic factors. High protein and lipid intake increased the risk of excessive GWG, whereas adequate intake of carbohydrates and legumes showed a protective effect. An initial significant association was identified between the LEPR rs1137101 variant (AA allele) and low birth weight (LBW); however, this association was lost after adjustment for confounding factors. The FTO rs9939609 variant was significantly associated with GWG. On the other hand, the LEPR rs1137101 variant in the offspring showed an association with BW categorized by percentiles (in crude analysis), while the FTO variant showed no relationship with birth weight. Full article

Air pollution has been associated with dysregulated metabolism. However, evidence linking prenatal air pollution exposure to gestational weight gain (GWG) pattern remains limited. This retrospective cohort study of 47,793 pregnant women in Guiyang (2013–2022) assessed associations between air pollutants and GWG pattern. Positive associations were observed between excessive GWG and CO (per 1 μg/m³ increase), NO₂, O₃, PM₁₀, PM_2.5, and SO₂ (per 10 μg/m³ increase) throughout the whole pregnancy period. Specifically, early-pregnancy exposure to CO (OR = 1.377, 95% CI: 1.201, 1.578) and NO₂ (OR = 1.098, 95% CI: 1.068, 1.130), along with exposure to PM₁₀ (OR = 1.058, 95% CI: 1.043, 1.073), PM_2.5 (OR = 1.095, 95% CI: 1.073, 1.118), and SO₂ (OR = 1.135, 95% CI: 1.102, 1.169) during late pregnancy significantly increased excessive GWG risk. Conversely, O₃ exposure was inversely associated with excessive GWG. For insufficient GWG, only early-pregnancy exposures to PM₁₀ (OR = 1.016, 95% CI: 1.001, 1.032), PM_2.5 (OR = 1.022, 95% CI: 1.001, 1.043), and SO₂ (OR = 1.031, 95% CI: 1.004, 1.058) showed significant positive associations. Furthermore, the restricted cubic spline (RCS) model revealed a nonlinear relationship between pollutant exposure and the risk of excessive GWG. Stratified analyses revealed that the air pollution and GWG (continuous) association was stronger among women with pre-pregnancy BMI ≥ 24 kg/m² and aged ≥ 30 years. This study confirms that, even at lower concentrations, exposure to air pollutants during pregnancy is significantly associated with an increased risk of abnormal GWG. Compared to previous studies focusing on high-concentration areas, this finding provides additional evidence for assessing the health risks of air pollution exposure during pregnancy, suggesting that the potential metabolic effects of low-level, long-term exposure should be considered when developing maternal health strategies. Full article

Background: Monitoring and managing gestational weight gain (GWG) during antenatal care (ANC) is linked to better maternal and neonatal outcomes. The Institute of Medicine (IOM) guidelines are based on pre-pregnancy BMI and reduce obstetric risks. Pregnant women’s views and healthcare providers’ (HCPs) practices are key to effective GWG counseling. This study aims to: (1) investigate the proportion of women who received GWG advice per IOM guidelines, and (2) explore HCP practices and views on GWG counseling. Methods: This is a cross-sectional study of Saudi pregnant women who delivered within one year of the study and HCPs who provided ANC. Women provided data on demographics, pre-pregnancy BMI, recall of GWG advice, and their target GWG. HCPs rated their knowledge and counseling practices. Results: Of 1151 women, 48.8% were pre-pregnancy overweight or obese, 47.6% were normal weight, and 3.6% were underweight. Most women (74.5%) received no GWG advice, and only 8.8% followed IOM guidelines. Women with obesity and overweight were more likely to receive correct advice (15.5% and 11.5%), compared to 5.3% of normal-weight and 2.4% underweight women. Overweight and obese women were more likely to define the correct GWG (AOR = 2.84 and 5.85). Receiving proper advice greatly increased the likelihood of proper GWG definition (AOR = 7.13). Among 28 HCPs, 53.6% reported that women rarely ask about the GWG target. Nearly 93% of them weigh women at each visit, but only 21.4% set personalized GWG targets. Most HCPs (82.2%) viewed discussing GWG as a high priority, and 70% felt confident providing guidance on GWG, diet, and exercise. Conclusions: Many women receive no GWG guidance, and most advice does not align with IOM guidelines. Enhancing Saudi women’s knowledge regarding GWG targets through health education, in conjunction with ongoing medical education for healthcare professionals concerning guidelines for GWG, represents modifiable factors and a critical opportunity to foster healthier pregnancy outcomes. Full article

This paper presents the design and optimization, based on electromagnetic simulation, of a fifth-order bandpass filter centered at 30 GHz, implemented using Gap Waveguide (GWG) technology and pole-type cylindrical resonators, intended for applications in 5G communication systems and high-frequency satellite links. Unlike conventional Chebyshev designs reported in the literature, this study proposes an integrated methodology that combines theoretical synthesis, full-wave electromagnetic modeling, and multivariable optimization, while accounting for manufacturing constraints. The developed method encompasses the electromagnetic characterization of individual resonators, the extraction of cavity–cavity coupling parameters, and the complete implementation of the filter using full-wave electromagnetic simulations. A distinctive aspect of the proposed approach is the explicit incorporation of practical manufacturing effects, such as rounded corners induced by machining processes, alongside analytical and numerical geometric compensation procedures that preserve the device’s electrical response. Furthermore, a combination of gradient-based optimization algorithms and evolutionary strategies is employed to align the electromagnetic response with the target theoretical behavior. The results obtained through electromagnetic simulation indicate that the designed filter achieves return losses exceeding 20 dB and a fractional bandwidth of 4.95%, consistent with the reference Chebyshev response. Finally, the potential extension of the proposed approach to higher frequency bands is discussed conceptually, laying the groundwork for future work that includes experimental validation. Full article

Background: The prevalence of being overweight and of obesity among women of childbearing age is constantly increasing. Objectives: To analyze the critical periods and goals of women’s weight management from early pregnancy to 3 years postpartum. Methods: Women’s weight was tracked from the first trimester of pregnancy to 3 years postpartum. We calculated their gestational weight gain (GWG) and postpartum weight retention (PPWR), and used linear mixed models and logistic models to estimate weight change velocities and risk factors associated with overweight/obesity at 1–3 years postpartum. Results: The medians of pre-pregnancy BMI (pre-BMI) and GWG among the 641 participants were 20.1 kg/m² and 15.0 kg. Among women with pre-BMI < 24 kg/m², those with excessive GWG remained at higher weights within 1.5 years postpartum than those with appropriate GWG (p < 0.05). Women’s weight decreased from 42 days to 1 year postpartum (β = −0.31 for low pre-BMI, β = −0.24 for normal pre-BMI, both p < 0.05), and remained unchanged from 1 to 3 years (p > 0.05). The rate of being overweight/obese at one year postpartum was mainly associated with pre-pregnancy weight (as a continuous variable, aOR = 1.58, 95%CI: 1.44–1.74) and 1-year PPWR (aOR = 1.78, 95%CI: 1.48–2.15). Compared with women who maintained normal BMI, those who shifted to being overweight/obese had higher pre-BMI and 1-year PPWR (22.6 kg/m² vs. 20.3 kg/m², 7.0 kg vs. 1.0 kg, p < 0.01). Conclusions: Normal and relatively low pre-BMI (18.5–22.0 kg/m²) and less than 2.0 kg of 1-year PPWR are goals of women’s weight management. Full article

Background: Obesity during pregnancy increases the risk of adverse maternal and neonatal outcomes, and excessive gestational weight gain (GWG) remains highly prevalent worldwide. Although physical activity (PA) interventions have shown potential benefits, evidence on the optimal type, intensity, and duration of exercise for overweight or obese pregnant women remains limited. Methods: Electronic searches of EBSCOhost, Embase, PubMed and Web of Science were performed through August 2025 to identify randomized controlled trials comparing PA interventions versus usual prenatal care in overweight or obese pregnant women. Two reviewers independently screened studies, extracted data, and assessed risk of bias using Cochrane ROB domains. Continuous outcomes were pooled using inverse-variance meta-analytic methods and heterogeneity was quantified by I². Results: Ten randomized trials (twelve intervention arms) comprising 1150 participants met the inclusion criteria. In the domain of blinding of participants and personnel, three studies (30%) were judged as low risk, while seven (70%) were unclear. PA interventions varied in modality (aerobic, resistance, endurance, walking), setting (clinic, community, home/mHealth), and the intervention period ranges from 10 to 34 weeks. Most interventions (80%) employed moderate intensity, and 30% combined aerobic and resistance training. Results of the meta-analysis showed that the pooled mean GWG was 9.93 ± 5.48 kg in the treatment group and 10.65 ± 5.70 kg in the control group. Overall, PA interventions produced a modest but statistically significant reduction in GWG compared with controls, with negligible between-study heterogeneity (I² = 0%). Conclusions: Tailored, moderate-intensity PA may have the potential to modestly reduce GWG. Although 30% included trials employed combined aerobic and resistance training, current evidence is insufficient to establish whether combined modalities are more effective than aerobic-only or resistance-only interventions. However, the current evidence is limited by small trial sizes, methodological variability and geographic concentration in higher-income settings. Larger, rigorously designed RCTs, including evaluations of digital delivery platforms and carefully supervised higher-intensity protocols, are needed to refine exercise prescriptions and inform clinical guidelines. Full article

Background: Gestational weight gain (GWG) is commonly used as an indicator of nutritional adequacy during pregnancy and a marker for pregnancy outcomes. This study aims to report the prevalence and extent of GWG inadequacy among Saudi women and to examine the effects of GWG inadequacy on pregnancy outcomes. Methods: This study was conducted as part of the Riyadh Mother and Baby Multicenter Cohort Study; it included 6984 women with singleton pregnancies. Adverse pregnancy outcomes—including hypertension, gestational diabetes (GDM), cesarean section (CS), low birth weight (LBW), Neonatal Intensive Care Unit admission (NICU), and macrosomia—were compared between women with adequate and inadequate GWG, based on the Institute of Medicine (IOM) guidelines. Results: Of the participants, 2221 women (31.8%) had adequate GWG for prepregnancy BMI, 2959 (42.4%) had inadequate GWG, and 1804 (25.8%) had excessive GWG. Women with normal prepregnancy BMI and inadequate GWG had significantly increased odds of delivering LBW infants (adjusted odds ratio (AOR) = 1.61, 95% CI: 1.17–2.20). Inadequate GWG also decreased the odds of emergency cesarean delivery among women with obesity (AOR = 0.75, 95% CI: 0.56–0.97) and lowered the likelihood of NICU admission for infants of obese women (AOR = 0.59, 95% CI: 0.36–0.97). Women with prepregnancy obesity experienced the highest rate of adverse outcomes; however, the prevalence of all adverse outcomes decreased as the degree of weight gain inadequacy increased. Conversely, underweight women had the highest percentage of LBW, with this percentage increasing as weight gain inadequacy increased. Conclusions: The effects of inadequate GWG vary depending on maternal prepregnancy BMI and the specific outcome assessed. For women with obesity, reduced weight gain during pregnancy may be beneficial. In contrast, inadequate GWG is associated with a higher incidence of LBW in women with normal prepregnancy BMI and underweight women. Full article

Background: Dysregulation of the hypothalamic–pituitary–adrenal axis is implicated in both gestational diabetes mellitus (GDM) and mood disorders, suggesting a shared pathophysiology. However, the impact of GDM on maternal depressive symptoms, particularly among women with “low and late” fertility, remains poorly characterized. Methods: We compared the risk of postpartum depressive symptoms, assessed on the second postpartum day using the Edinburgh Postnatal Depression Scale (EPDS), with a cut-off score ≥ 12, and the Anhedonia, Anxiety, and Depression subscales, between Northeast Italian women with GDM and control participants with normal oral glucose tolerance tests (OGTT), classified as having “low and late fertility”. Results: Among the 2560 women included in the analysis, 231 (9.02%) had GDM. Compared with controls with normal OGTT, women with GDM were older (36.0 vs. 33.0 years, p < 0.001) and had higher pre-pregnancy BMI (23.4 vs. 21.6 kg/m², p < 0.001), but lower gestational weight gain (GWG) (11.0 vs. 13.0 kg, p < 0.001), with no difference in parity [2.00 vs. 1.00, p = 0.5. In addition, GDM was not associated with increased postpartum depressive symptoms (15% EPDS scores ≥12 in both groups, p > 0.9) or with Anhedonia, Anxiety, or Depression subscale scores (p = 0.7). Conclusions: Advanced maternal age and reduced parity, hallmarks of women postponing childbearing, do not appear to confer an increased risk of early postpartum mood comorbidities in the context of GDM. Promoting healthy physical and mental well-being among women in this demographic category requires integrated strategies encompassing nutrition, healthcare, and education. Full article

Background/Objectives: Gestational diabetes mellitus (GDM) is associated with altered maternal gut microbiota and increased risk of large-for-gestational age (LGA) births. The contribution of gut microbiota to fetal overgrowth in GDM, independent of glycemic control, remains unclear. Methods: In this pilot longitudinal study, the gut microbiota of 18 women with GDM was followed from the second (2T) to the third trimester (3T). Maternal fecal samples were analyzed by 16S rRNA gene sequencing, and associations between microbial profiles and infant birth weight were examined. In addition, these associations were adjusted for pre-pregnancy body mass index (BMI) and gestational weight gain (GWG). Results: Maternal gut microbiota of LGA infants exhibited consistently lower microbial diversity, a reduced Bacillota/Bacteroidota ratio, and enrichment of pro-inflammatory taxa including Prevotella, Sutterella, and Bilophila. Short-chain fatty acids (SCFAs)-producing genera such as Acinetobacter, Odoribacter, Faecalibacterium, and Lachnoclostridium were depleted. Although Bilophila was identified as a third-trimester biomarker with LEfSE approach, its association with LGA disappeared after adjusting for BMI and GWG. Conversely, Nitrospirota, Polaromonas, Acinetobacter, and Aeromonas correlated negatively with LGA even after BMI and GWG adjustment. Conclusions: These findings suggest that specific maternal microbiota signatures, together with pre-pregnancy adiposity, influence fetal overgrowth in GDM and may serve as early biomarkers or targets for preventive interventions. Full article

Background/Objectives: The nutrition and lifestyle choices made during pregnancy significantly impact the long-term health of both mother and child. This observational study, conducted at the Jersey Maternity Unit, investigated how maternal diet and weight influence delivery outcomes and newborn feeding methods among 81 pregnant women. The aim of the study was to assess whether maternal diet, weight changes, and infant feeding practices vary according to ethnicity and duration of residence in Jersey, in order to inform culturally sensitive health improvement strategies. Methods: The FFQ was used to characterise the diet before and during pregnancy. Diet quality was assessed by the 9-item aMED score. Data on anthropometric measurements (including gestational weight gain, GWG), socioeconomic characteristics, and infant feeding methods (including breastfeeding rates) were collected. Results: The statistical analyses evaluate differences and distribution of data in the groups of women based on the ethnicity and period the mothers had lived on the island. For all the women, there were significant changes in the weight gained at week 28 compared to weeks 8 and 12 (+8.0 (4.0; 12.1) kg, p ≤ 0.001), as well as the period before pregnancy until the 34th week of gestation (+11.9 (8.0; 12.1) kg, p ≤ 0.001). The intake of low-fat dairy, whole grains, and fruit changed through the gestation period and differed between pregnant women with different periods of island residence. There were no changes in the aMED score and adherence. Conclusions: Maternal weight gain followed a consistent pattern during pregnancy, whereas dietary behaviours—particularly the consumption of key food groups—varied by cultural background and length of residence. These findings emphasise the need for culturally sensitive antenatal care and tailored nutrition strategies to improve maternal outcomes, support breastfeeding, and reduce long-term health risks for mothers and children in Jersey’s multicultural population. Full article

Gestational weight gain (GWG) is a critical determinant of maternal and neonatal health, yet its patterns and consequences in displaced populations remain understudied. This study examined the association between GWG and birth outcomes among Forcibly Displaced Rohingya (FDR) women in Cox’s Bazar, Bangladesh. We conducted a longitudinal cohort study from October 2022 to October 2024, enrolling 2888 pregnant women at different stages of pregnancy. Among them, 301 were recruited in the first trimester and followed through the third trimester, with 231 neonatal outcomes recorded within 72 hours of delivery. Overall, 66.8% of women experienced inadequate GWG. Despite the high prevalence of inadequate GWG, mean birth weight (2.79 kg) and mean gestational age at delivery (38.6 weeks) were within favorable ranges. Inadequate GWG was more common in mothers aged 30–39 years (p = 0.061) but significantly less common in underweight mothers (p = 0.012). GWG was positively associated with neonatal birth weight, length, and weight–length ratio (WLR) Z score, but not with gestational age. After adjusting for confounding factors, inadequate GWG showed a significant independent association with lower birth length (p = 0.016). These findings highlight the need for targeted interventions in displaced populations. Full article

Few studies have prospectively examined the joint effect of mercury (Hg) and omega-3 long-chain polyunsaturated fatty acids on gestational weight gain (GWG). This exploratory study included 120 women from the Environment and Reproductive Health (EARTH) study with preconception measurements of hair Hg and serum eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), followed through pregnancy. Linear regression was used to examine associations between hair Hg and GWG, while logistic regression estimated the odds of inadequate GWG based on National Academy of Medicine recommendations. In unadjusted models, higher hair Hg (≥1 vs. <1 ppm) was associated with lower GWG (β = −1.89; 95% CI: −3.70, −0.08) and increased odds of insufficient GWG (OR = 2.27; 95% CI: 1.00, 5.18). However, after multivariable adjustment including serum EPA + DHA, these associations were attenuated and became non-significant. A negative, though not statistically significant, association between hair Hg and GWG was observed among women in the lowest tertile of serum EPA + DHA (≥1 vs. <1 ppm: β = −3.26; 95% CI: −7.69, 1.17), whereas no such association was observed among those in higher tertiles (β [95% CI] = 0.44 [−4.21, 5.09] and −1.05 [−4.13, 2.02], respectively). Our findings suggest that the association between preconception Hg exposure and insufficient GWG may differ by serum EPA + DHA, but results require confirmation in cohorts with larger sample sizes. Full article

Background/Objectives: The association between gestational weight gain (GWG) and adverse outcomes in individuals with gestational diabetes mellitus (GDM) and obesity remains unclear. This study aimed to evaluate the relationship between total GWG and maternal, obstetric, and neonatal outcomes in patients with GDM, stratified by obesity class. Methods: This retrospective cohort included 695 pregnant individuals with GDM treated at a tertiary university hospital in Brazil between 2007 and 2021. GWG was categorized as insufficient, adequate, or excessive per National Academy of Medicine guidelines. Outcomes included maternal, obstetric, and neonatal events. Analyses were conducted for the entire cohort and stratified by obesity class (I and II/III), using multivariate regression models adjusted for maternal age, parity, and pre-pregnancy BMI. Results: The mean age was 33.6 (SD 5.7) years. GWG was insufficient in 33.2%, adequate in 28.2%, and excessive in 37.8%. Excessive GWG was associated with increased odds of cesarean delivery (OR 1.69; 95% CI 1.15–2.48) and large-for-gestational-age newborns (OR 3.29; 95% CI 1.61–6.46). As a continuous variable, GWG was positively associated with cesarean delivery (OR 1.04), LGA (OR 1.10), and birthweight (β = 0.02). Lower GWG was independently associated with reduced preeclampsia risk (OR 1.09 per kg). Insufficient GWG was not linked to increased risk of small-for-gestational-age newborns or other adverse outcomes and was associated with lower insulin requirement. Results remained consistent across obesity subgroups, except for cesarean delivery in class II/III obesity. Conclusions: In individuals with GDM and obesity, insufficient GWG was not associated with increased adverse outcomes, while excessive GWG was consistently linked to unfavorable maternal and neonatal risks. Stricter GWG control may be safe and beneficial in this population. Full article

Background/Objectives: Gestational weight gain (GWG) is a crucial factor influencing mother and fetal health, as high GWG is associated with adverse pregnancy outcomes and an increased long-term risk of obesity and metabolic issues in the children. In addition to controlling weight, maternal physical activity (PA) during pregnancy may influence fetal development through potential epigenetic mechanisms, including histone modifications, DNA methylation, and the production of non-coding RNA. Methods: This narrative review synthesizes evidence from randomized controlled trials (RCTs; n = 11, 3654 participants) investigating the impact of aerobic PA on GWG, while also highlighting emerging, primarily indirect findings on maternal–fetal epigenetic programming. Results: The majority of RCTs found that supervised PA interventions, especially when paired with nutritional counseling, decreased both the incidence of excessive GWG and total GWG. Enhancements in lipid metabolism, adipokine profiles, and maternal insulin sensitivity point to likely biochemical mechanisms that connect PA to epigenetic modification of fetal metabolic genes (e.g., IGF2, PGC-1α, LEP). Animal and observational studies suggest that maternal activity may influence offspring epigenetic pathways related to obesity and cardiometabolic conditions, although direct human evidence is limited. Conclusions: In addition to potentially changing gene–environment interactions throughout generations, prenatal PA is a low-cost, safe method of improving maternal and newborn health. Future RCTs ought to incorporate molecular endpoints to elucidate the epigenetic processes by which maternal exercise may provide long-term health benefits. Full article