The vicious cycle of diabetes and pregnancy

Relationship between food insecurity and a gestational diabetes risk reduction intervention: outcomes among American Indian and Alaska Native adolescent and young adult females

American Indian and Alaska Natives (AI/ANs) are disproportionately impacted by gestational diabetes mellitus (GDM), subsequent type 2 diabetes, and food insecurity. It is prudent to decrease risk of GDM prior to pregnancy to decrease the intergenerational cycle of diabetes in AI/AN communities. The purpose of this project is to describe and examine food insecurity, healthy eating self-efficacy, and healthy eating behaviors among AI/AN females (12-24 years old) as related to GDM risk reduction. Methods included: secondary analysis of healthy eating self-efficacy and behaviors, and household-level food insecurity measures from an randomized controlled trial that tested the effect of engagement in a GDM risk reduction educational intervention on knowledge, behavior, and self-efficacy for GDM risk reduction from baseline to 3-month follow-up. Participants were AI/AN daughters (12-24 years old) and their mothers (N = 149 dyads). Researchers found that more than one-third (38.1%) reported food insecurity. At baseline food insecurity was associated with higher levels of eating vegetables and fruit for the full sample (p = .045) and cohabitating dyads (p = .002). By 3 months healthy eating self-efficacy (p = .048) and limiting snacking between meals (p = .031) improved more in the control group than the intervention group only for cohabitating dyads. For the full sample, the intervention group had increases in times eating vegetables (p = .022) and fruit (p = .015), whereas the control group had declines. In the full sample, food insecurity did not moderate the group by time interaction for self-efficacy for healthy eating (p ≥ .05) but did moderate the group by time interaction for times drinking soda (p = .004) and days eating breakfast (p = .013). For cohabitating dyads, food insecurity did moderate self-efficacy for eating 3 meals a day (p = .024) and days eating breakfast (p = .012). These results suggest food insecurity is an important factor regarding the efficacy of interventions designed to reduce GDM risk and offer unique insight on "upstream causes" of GDM health disparities among AI/AN communities.

Respecting tribal voices in the development of a gestational diabetes risk reduction preconception counseling program for American Indian/Alaska Native adolescent females: a qualitative study

BACKGROUND

American Indians and Alaska Natives (AI/AN) are disproportionately affected by adolescent obesity, adolescent pregnancy and gestational diabetes mellitus (GDM). GDM is associated with increased risk for perinatal death, obesity, and subsequent type 2 diabetes (T2D) for the offspring. Moreover, mothers with GDM are also at increased risk for T2D post-partum. Yet few lifestyle interventions exist to reduce GDM risk prior to pregnancy. We describe the process of adapting an existing validated preconception counseling intervention for AI/AN adolescent girls at-risk for GDM and their mothers. Perspectives and recommendations were gathered from a diverse array of stakeholders to assure the new program called Stopping GDM was culturally responsive and developed with tribal voices and perspectives represented.

METHODS

We conducted focus groups and individual interviews with multiple AI/AN stakeholders (n = 55). Focus groups and interviews were digitally recorded, transcribed verbatim, and analyzed using a thematic content approach to construct cross-cutting themes across the focus groups and interviews.

RESULTS

Four key themes emerged reflecting issues important to planning a reproductive health intervention: 1) Limited awareness, knowledge, and health education resources about GDM; 2) The importance of acknowledging traditional AI/AN values and the diversity of traditions and culture among AI/AN tribes; 3) The need to cultivate healthy decision-making skills and empower girls to make safe and healthy choices; and 4) Lack of communication about reproductive health between AI/AN mothers and daughters and between AI/AN women and health care professionals.

CONCLUSION

Findings have been used to inform the cultural tailoring and adaptation of an existing preconception counseling program, originally designed for non-AI/AN adolescent girls with diabetes, for AI/AN adolescents at-risk for GDM in future pregnancies.

Comparing American Indian/Alaska Native Adolescent Daughters' and Their Mothers' Awareness, Knowledge, Attitudes, and Behaviors Regarding Risk for Gestational Diabetes: Implications for Mother-Daughter Communication on Reproductive Health

PURPOSE

The purpose of the study was to describe, compare, and examine associations at baseline of reproductive health awareness, knowledge, health beliefs, communication and behaviors related to gestational diabetes (GDM) and GDM risk reduction in a vulnerable population of both American Indian/Alaska Native (AIAN) adolescent girls and their mothers.

METHODS

Descriptive/comparative/correlational analyses examined multitribal baseline data on 149 mother-daughter (M-D) dyads (N = 298; daughter age = 12-24 years) enrolled in a longitudinal study to adapt and evaluate a culturally relevant diabetes preconception counseling (PC) program (Stopping-GDM). The associations between GDM risk reduction awareness, knowledge, health beliefs, and behaviors (eg, daughters' eating, physical activity, reproductive-health [RH] choices/planning, M-D communication, daughters' discussions on PC) were examined. Data collected online from 5 national sites.

RESULTS

Many M-D lacked awareness/knowledge of GDM and risk reduction. Both M-D were unaware of the girl's risk for GDM. Mothers' knowledge and beliefs on GDM prevention/RH were significantly higher than daughters. Younger daughters had greater self-efficacy healthy living. Overall sample reported low to moderate scores for both M-D communication and daughters' GDM and RH risk-reduction behaviors.

CONCLUSIONS

Knowledge, communication, and behaviors to prevent GDM were low in AIAN M-D, especially daughters. More than daughters, mothers perceive greater risk of GDM for daughters. Early culturally responsive dyadic PC programs could help decrease risk of developing GDM. Implications for M-D communication is compelling.

The Experiences of American Indian Participants and Site Coordinators in a Gestational Diabetes Risk Reduction Trial

Gestational diabetes mellitus is the most common complication of pregnancy and contributes to increased risk for type 2 diabetes in both the mother and offspring. We developed and evaluated a gestational diabetes risk reduction and preconception counseling program, Stopping GDM (SGDM), for American Indian females. The purpose of this study is to examine the experiences of American Indian mother-daughter dyad participants and the site coordinators who facilitated the SGDM randomized controlled trial to inform program revisions. We engaged mother-daughter dyads (n = 22 dyads) and site coordinators (n = 6) in focus group interviews. Four themes emerged: (1) SGDM sparked valuable quality conversation for dyads; (2) gestational diabetes risk factors and risk reduction was new information for most dyads; (3) all trial sites experienced challenges to recruitment and engagement; and (4) study-improvement recommendations. These findings will be used to enhance SGDM to decrease adverse intergenerational health impacts of gestational diabetes in American Indian communities.

Gestational Diabetes and Breastfeeding Among Women of Different Races/Ethnicities: Evidence from the Pregnancy Risk Assessment Monitoring Surveys

OBJECTIVE

To examine risk factors for gestational diabetes mellitus (GDM) and factors associated with breastfeeding patterns among women with GDM from different racial/ethnic groups.

METHODS

We used data from Phase 8 (2016-2018) of the Pregnancy Risk Assessment Monitoring System. We used logistic regression to estimate factors associated with GDM and with breastfeeding initiation, and conducted survival analysis using Kaplan-Meier curves, and Cox proportional hazards regression to analyze early cessation of breastfeeding.

RESULTS

Among American Indian and Alaska Native (AI/AN) women, higher education reduced odds (aOR = 0.33; 95% CI: 0.19-0.59) and being married increased odds (aOR = 1.35; 95% CI: 1.02-1.79) of GDM. AI/AN women who received WIC benefits had lower odds of initiating breastfeeding (aOR = 0.70; 95% CI: 0.51-0.95). While there was no association between GDM and initiation of breastfeeding, only a third of AI/AN women with GDM were still breastfeeding by 36 weeks postpartum, compared to more than half of non-Hispanic White and Hispanic women.

CONCLUSIONS FOR PRACTICE

Efforts to reduce GDM among those most at risk are needed, especially among racial and ethnic minorities. Increasing support for women with GDM to continue to breastfeed may improve maternal and child health outcomes and reduce health disparities, particularly among AI/AN women.

Reducing risk for gestational diabetes among American Indian and Alaska Native teenagers: Tribal leaders' recommendations

OBJECTIVE

To elicit feedback from tribal leaders and American Indian/Alaska Native (AI/AN) health system administrators as a national stakeholder perspective to inform the development of a gestational diabetes mellitus (GDM) risk reduction and preconception counseling intervention for AI/AN teenagers at high risk for GDM.

METHODS

A semi-structured focus group interview guide was developed by both principal investigators and qualitative methods experts. Using open-ended questions about the Reproductive-health Education and Awareness of Diabetes in Youth for Girls (READY-Girls) booklet and video clips, AI/AN health care system administrators and elected tribal leaders attending the 2015 National Indian Health Board Conference in Washington, DC, made recommendations on adaptation for an AI/AN audience. The focus group was recorded, transcribed verbatim, and analyzed by two researchers using an inductive coding technique with constant comparison method as supported by the grounded theory approach.

RESULTS

Recommendations from the 12 participants included: (1) the best ways to communicate with AI/AN teenagers, (2) the importance of parental, family, and community education and engagement to support AI/AN teenagers in GDM risk reduction, and (3) building on traditional AI/AN cultural values and practices, while accommodating differences between tribes and regions.

CONCLUSION

Findings from this focus group were used to inform the iterative development of a GDM risk reduction and preconception counseling intervention for AI/AN teenagers.

Stopping Gestational Diabetes in American Indian and Alaska Native Girls: Nutrition as a Key Component to Gestational Diabetes Risk Reduction

BACKGROUND

American Indian and Alaska Native (AI/AN) women have a higher risk of gestational diabetes mellitus (GDM) and subsequent diagnosis of diabetes than do non-Hispanic White women. Healthy eating is key to weight management both prior to pregnancy and between pregnancies and can reduce the risk of developing GDM. Our research team developed an innovative preconception counseling and diabetes risk-reduction program, which includes nutrition and weight-management principles and is culturally tailored for adolescent AI/AN women. The program is entitled Stopping Gestational Diabetes Mellitus (SGDM).

OBJECTIVE

The purpose of this article is to examine nutrition-related information collected as a part of the formative qualitative research conducted for the development of a preconception counseling and gestational diabetes risk-reduction program, SGDM.

METHODS

This in-depth secondary analysis explored the original qualitative data from the needs assessment for SGDM program development. Participants included AI/AN women with a history of GDM (n = 5); AI/AN girls at risk of GDM (n = 14), and their mothers (n = 11), health care providers, and health administrators who care for AI/AN girls (n = 16); AI/AN elected leaders; and Indian health system administrators (n = 12). All focus groups and interviews were reanalyzed utilizing the following research question: "How do key stakeholders discuss food and/or nutrition in terms of gestational diabetes risk reduction for AI/AN adolescent girls?"

RESULTS

Three primary nutrition themes emerged: 1) AI/AN women were aware of healthy nutrition, healthy weight gainduring pregnancy, and healthy nutrition for people with type 2 diabetes, but these principles were not linked to reducing the risk of GDM; 2) participants expressed the need for education on the role of nutrition and weight management in GDM risk reduction; 3) participants shared challenges of healthful eating during and before pregnancy for AI/AN women.

CONCLUSIONS

These stakeholders' comments informed the development of the nutrition components of SGDM.

Adolescent Latinas' with Diabetes and Their Mothers' Understanding of Diabetes and Reproductive Health: Converging Themes to Inform a Culturally Sensitive Preconception Counseling Program

INTRODUCTION

Latinas are at an increased risk for diabetes and reproductive health (RH) complications with sexuality and pregnancy. This study explored the understanding of diabetes related to RH, pregnancy, unplanned pregnancies, preconceptioncounseling, tight-control, and family planning among Latina adolescents with diabetes and their mothers and explored converging themes.

METHOD

The qualitative descriptive study used written open-ended questions (English or Spanish) with Latina mothers (n = 13) and daughters (n = 21). Responses were transcribed. Content analysis was used by four researchers who coded and discussed themes and reached consensus. Converging themes were confirmed using Atlas.ti software.

RESULTS

Seven themes emerged from the mother-daughter dyad: communication (awkwardness, ambivalence, styles); control (being controlled vs. controlling); consequences (fertility, complications); planning (pregnancy, being healthy, life plan, RH); support; danger, risk, and safety; and stigma.

DISCUSSION

Many mother-daughter dyads were not ready to discuss RH among themselves. Cultural and familial perspectives should be considered when providing care and preconception counseling to this population.

Beta Testing of a Gestational Diabetes Risk Reduction Intervention for American Indian and Alaska Native Teens

INTRODUCTION

American Indian and Alaska Native (AIAN) girls have double the risk of obesity, pregnancy, and gestational diabetes mellitus (GDM) than the general U.S.

POPULATION

The purpose of this study was to beta test Stopping GDM (SGDM), a GDM risk reduction intervention for at-risk AIAN teens, before beginning a randomized controlled trial.

METHOD

A sample of 11 AIAN mothers and daughters were recruited through an urban Indian health program. Daughters were at risk of GDM as assessed by a BMI ≥ 85th percentile. Pre- and posttest online questionnaires evaluated the online intervention (e-book and video).

RESULTS

Mean pre- to posttest knowledge increased for mothers and daughters on diabetes prevention, reproductive health, and GDM knowledge. Daughters demonstrated an increased self-efficacy for healthy living and pregnancy planning. Satisfaction for the e-book, video, and online survey was moderately high to very high.

DISCUSSION

The SGDM intervention is feasible and acceptable in AIAN mother-daughter dyads. These findings informed the SGDM intervention and the randomized controlled trial evaluation protocol.

Recommendations from an expert panel of health professionals regarding a gestational diabetes risk reduction intervention for American Indian/Alaska Native Teens

BACKGROUND

American Indian/Alaska Native (AI/AN) adolescents are at higher risk for gestational diabetes (GDM), type 2 diabetes, and pregnancy complications than the general population.

OBJECTIVE

To inform cultural adaptation of a validated evidence-based intervention (VEBI) originally designed to deliver preconception counseling and diabetes education to non-AI/AN teens with diabetes.

DESIGN

Qualitative data were collected using focus group and individual interview methods with health care professionals and experts (n = 16) in AI/AN health, GDM, adolescent health, and/or mother-daughter communication. A semistructured discussion guide elicited responses about provision of care for AI/AN girls at risk for GDM, experience with successful programs for AI/AN teens, comfort of mother/daughter dyads in talking about diabetes and reproductive health and reactions to video clips and booklet selections from the VEBI. All interviews were recorded and transcribed verbatim, and data analysis included inductive coding and identification of emergent themes.

RESULTS

Providers felt teens and their moms would be comfortable talking about the VEBI topics and that teens who did not feel comfortable talking to their mom would likely rely on another adult female. Participants suggested including: AI/AN images/motifs, education with a community focus, and avoiding directive language. Concerns included: socioeconomic issues that affect AI/AN people such as: food and housing insecurity, abuse, and historical trauma.

CONCLUSIONS

Perspectives from these participants have been used to guide the development of a culturally tailored GDM risk reduction program for AI/AN girls. This program will be available to health care providers who serve the AI/AN population.

Pregnancy and Gestational Diabetes Mellitus (GDM) in North American Indian Adolescents and Young Adults (AYA): Implications for Girls and Stopping GDM

PURPOSE OF REVIEW

To provide an updated synopsis of the research and clinical practice findings on pregnancy and gestational diabetes mellitus (GDM) in American Indian and Alaska Native (AIAN) adolescents and to describe the newly developed "Stopping GDM," an early intervention, culturally tailored risk reduction program for AIAN girls and their mothers.

RECENT FINDINGS

Five research articles met our inclusion criteria. Three retrospective quantitative studies published in the past 10 years corroborated a 1.5 to 2 times higher prevalence for GDM for all age groups in the AIAN population as compared to other ethnic groups, and that the percentage of GDM cases attributable to overweight and obesity was highest for AIs (52.8%). Moreover, First Nations women across all age groups had more adverse pregnancy risk factors than non-First Nations women. Out of the five selected articles, two were qualitative research articles: one examined AIAN women's experiences of having GDM or type 2 diabetes (T2D) during pregnancy and the other appraised the understanding of GDM and reproductive health of at-risk AIAN girls. There is a paucity of research published on this topic. AIAN females are at high risk for developing GDM. Early, culturally responsive interventions and cohort follow-up studies are needed among adolescents and young adults, using technology that appeals to this age group.

Reducing Risk for Gestational Diabetes Mellitus (GDM) Through a Preconception Counseling Program for American Indian/Alaska Native Girls: Perceptions From Women With Type 2 Diabetes or a History of GDM

Purpose

American Indian and Alaska Native (AIAN) women are disproportionately affected by gestational diabetes mellitus (GDM). GDM is a risk factor for subsequent diagnosis of type 2 diabetes (T2D) in both mother and offspring, yet there is minimal research being conducted in this population. The purpose of this portion of a larger 5-year study is to examine AIAN women’s experiences of having GDM or T2D during pregnancy, inform the development of a GDM risk reduction and preconception counseling (PC) program tailored to AIAN girls, and enhance mother-daughter communication and support within the program.

Methods

AIAN women with TD2 or a history of GDM (N = 5) were interviewed to understand their unique perspectives on diabetes and pregnancy, behaviors to reduce risk, and content for a PC education program for AIAN girls. Interviews were digitally recorded, transcribed verbatim, and analyzed using the constant comparison method to construct themes across the interviews.

Results

Four primary themes were constructed: lack of knowledge on GDM and GDM risk factors, importance of AIAN culture for health and wellness, suggestions for communication with AIAN girls to reduce risk of GDM, and the emotional impact of GDM diagnosis.

Conclusions

Participants wished they had known about risk factors for GDM and how to reduce their own risk of developing GDM. Findings from this study have been used to adapt an existing PC program, originally developed for non-AIAN girls with diabetes, for AIAN girls who do not have diabetes but have risk factors for developing GDM in future pregnancies.

Cultural understanding, experiences, barriers, and facilitators of healthcare providers when providing preconception counseling to adolescent Latinas with diabetes

Background

Latinas are at a higher risk than Caucasians for both type 1 and type 2 diabetes (DM), as well as DM-associated reproductive health (RH) complications. Healthcare providers (HCPs) should deliver culturally-sensitive care to enhance the care relationship between Latinos and HCPs and to improve patient outcomes. This study explored an expert panel's cultural understanding, experiences, barriers, and facilitators regarding RH and preconception counseling (PC) for adolescent Latinas with DM and their families.

Methods

This study used open-ended questions with a focus group of 8 HCPs from the mid-Atlantic, Southwest, and Northwest regions of the United States in a teleconference format. Two researchers transcribed and reviewed the transcript for accuracy. Using content analysis, four members of the team identified themes. All researchers discussed themes and a 100% consensus was reached. For confirmation, a coding protocol was created based on the emerging themes.

Results

Five themes related to cultural understanding and experiences were identified: 1) issues of identity; 2) acculturation; 3) stigma; 4) ambivalence toward birth control, RH education, and PC; and 5) cultural sensitivity vs. best practice. Four barriers were identified: 1) language; 2) religion; 3) access to healthcare, and 4) discomfort with discussion. Ten facilitators were identified: 1) the importance of support and support networks; 2) promoting trust among HCPs, daughters, and families; 3) assessing emotional development; 4) empowerment; 5) emphasizing safety; 6) communicating in patients' preferred language; 7) discussing RH-related topics and PC using cultural sensitivity; 8) importance of being ready/temporality/planning for the future; 9) the importance of family-centered care; and 10) variation in educational tailoring and dissemination/ care delivery.

Conclusions

Findings support the need for culturally sensitive and developmentally appropriate PC programs to empower adolescent Latinas with DM.

Nutrient-Driven O-GlcNAcylation at Promoters Impacts Genome-Wide RNA Pol II Distribution

Nutrient-driven O-GlcNAcylation has been linked to epigenetic regulation of gene expression in metazoans. In C. elegans, O-GlcNAc marks the promoters of over 800 developmental, metabolic, and stress-related genes; these O-GlcNAc marked genes show a strong 5', promoter-proximal bias in the distribution of RNA Polymerase II (Pol II). In response to starvation or feeding, the steady state distribution of O-GlcNAc at promoters remain nearly constant presumably due to dynamic cycling mediated by the transferase OGT-1 and the O-GlcNAcase OGA-1. However, in viable mutants lacking either of these enzymes of O-GlcNAc metabolism, the nutrient-responsive GlcNAcylation of promoters is dramatically altered. Blocked O-GlcNAc cycling leads to a striking nutrient-dependent accumulation of O-GlcNAc on RNA Pol II. O-GlcNAc cycling mutants also show an exaggerated, nutrient-responsive redistribution of promoter-proximal RNA Pol II isoforms and extensive transcriptional deregulation. Our findings suggest a complex interplay between the O-GlcNAc modification at promoters, the kinase-dependent "CTD-code," and co-factors regulating RNA Pol II dynamics. Nutrient-responsive O-GlcNAc cycling may buffer the transcriptional apparatus from dramatic swings in nutrient availability by modulating promoter activity to meet metabolic and developmental needs.

Operationalizing and Examining Family Planning Vigilance in Adult Women With Type 1 Diabetes

OBJECTIVE

Because unplanned pregnancies could cause maternal-fetal complications for women with diabetes, family planning vigilance (FPV) is imperative. The aims of this article are to operationalize and describe FPV and examine the associations among FPV behaviors and diabetes self-care management (DSM) and health outcomes of women with type 1 diabetes (T1D).

RESEARCH DESIGN AND METHODS

Retrospective data were used from a follow-up study of adult women with T1D who participated as adolescents in a preconception counseling (PC) intervention trial and matched comparison women with T1D who did not receive the adolescent PC intervention. Participants completed online questionnaires regarding family planning behaviors, DSM, and clinical and reproductive health outcomes.

RESULTS

Participants (N = 102) were, on average, 23.7 years old (range 18-38) and 98.0% were white, 82.2% had some college, 25.8% were married, and 11.8% had biological children. Of those sexually active (n = 80, 78.4%), 50% were contraceptive vigilant and 11% were FPV (i.e., being contraceptive vigilant, receiving PC, and initiating discussions with health care professionals). Among FPV behaviors, only receiving PC and initiating discussion with health care professionals were correlated (r = 0.29, P = 0.010). Compared with nonvigilant women, contraceptive vigilant and FPV women used more effective contraceptive methods (P = 0.025) and experienced less diabetic ketoacidosis (P = 0.040) and hospitalizations (P = 0.064), whereas FPV women were aware of PC (P = 0.046) and younger when they received PC (P < 0.001). FPV components were associated with DSM and health outcomes (P < 0.05).

CONCLUSIONS

Women with diabetes should be FPV, but few were. FPV women were more likely to have PC earlier and better health outcomes, supporting early PC intervention.

Global cost-effectiveness of GDM screening and management: current knowledge and future needs

Gestational diabetes mellitus (GDM) is an increasing cause of morbidity in women and their offspring. Screening and intervention can reduce perinatal and most likely also long-term diabetes consequences. There have been many economic studies, but not recently systematically compared. We conducted a systematic search and abstraction of cost-effectiveness and cost-utility studies from 2002 to 2014. We standardized all findings to 2014 US dollars. We found that cost-effectiveness ratios varied widely. Most variation was found to be due to differences in geographic setting, diagnostic criteria and intervention approaches, and outcomes (e.g., inclusion or exclusion of long-term type 2 diabetes risk and associated costs). We concluded that incorporation of long-term benefits of GDM screening and treatment has huge impact on cost-effectiveness estimates. Based on the large methodological heterogeneity and varying results in the existing body of evidence, we find it unreasonable to outline any global recommendations. For future economic studies, we recommend inclusion of long-term outcomes and adaptation to local preferences, as well as examination of the impact of the diagnostic criteria recently proposed by the International Association of Diabetes in Pregnancy Study Groups (IADPSG).

O-GlcNAc cycling: a link between metabolism and chronic disease

To maintain homeostasis under variable nutrient conditions, cells rapidly and robustly respond to fluctuations through adaptable signaling networks. Evidence suggests that the O-linked N-acetylglucosamine (O-GlcNAc) posttranslational modification of serine and threonine residues functions as a critical regulator of intracellular signaling cascades in response to nutrient changes. O-GlcNAc is a highly regulated, reversible modification poised to integrate metabolic signals and acts to influence many cellular processes, including cellular signaling, protein stability, and transcription. This review describes the role O-GlcNAc plays in governing both integrated cellular processes and the activity of individual proteins in response to nutrient levels. Moreover, we discuss the ways in which cellular changes in O-GlcNAc status may be linked to chronic diseases such as type 2 diabetes, neurodegeneration, and cancers, providing a unique window through which to identify and treat disease conditions.

Macrosomia in 23 developing countries: an analysis of a multicountry, facility-based, cross-sectional survey

BACKGROUND

Macrosomia is a risk factor for adverse delivery outcomes. We investigated the prevalence, risk factors, and delivery outcomes of babies with macrosomia in 23 developing countries in Africa, Asia, and Latin America.

METHODS

We analysed data from WHO's Global Survey on Maternal and Perinatal Health, which was a facility-based cross-sectional study that obtained data for women giving birth in 373 health facilities in 24 countries in Africa and Latin America in 2004-05, and in Asia in 2007-08. Facilities were selected by stratified multistage cluster sampling and women were recruited at admission for delivery. We extracted data from the medical records with a standardised questionnaire. We used logistic regression with random effects to assess the risk factors for macrosomia and the risks for caesarean section and adverse maternal and perinatal outcomes (assessed by a composite score) in babies with the disorder.

FINDINGS

Of 290,610 deliveries, we analysed data for 276,436 singleton livebirths or fresh stillbirths. Higher maternal age (20-34 years), height, parity, body-mass index, and presence of diabetes, post-term pregnancy, and male fetal sex were associated with a significantly increased risk of macrosomia. Macrosomia was associated with an increased risk of caesarean section because of obstructed labour and post-term pregnancy in all regions. Additionally, macrosomia was associated with an increased risk of adverse maternal birth outcomes in all regions, and of adverse perinatal outcomes only in Africa.

INTERPRETATION

Increasing prevalence of diabetes and obesity in women of reproductive age in developing countries could be associated with a parallel increase in macrosomic births. The effect and feasibility of control of diabetes and preconception weight on macrosomia should be investigated in these settings. Furthermore, increased institutional delivery in countries where rates are low could be crucial to reduce macrosomia-associated morbidity and mortality.

FUNDING

None.

Developmental plasticity and epigenetic mechanisms underpinning metabolic and cardiovascular diseases

The importance of developmental factors in influencing the risk of later-life disease has a strong evidence base derived from multiple epidemiological, clinical and experimental studies in animals and humans. During early life, an organism is able to adjust its phenotypic development in response to environmental cues. Such developmentally plastic responses evolved as a fitness-maximizing strategy to cope with variable environments. There are now increasing data that these responses are, at least partially, underpinned by epigenetic mechanisms. A mismatch between the early and later-life environments may lead to inappropriate early life-course epigenomic changes that manifest in later life as increased vulnerability to disease. There is also growing evidence for the transgenerational transmission of epigenetic marks. This article reviews the evidence that susceptibility to metabolic and cardiovascular disease in humans is linked to changes in epigenetic marks induced by early-life environmental cues, and discusses the clinical, public health and therapeutic implications that arise.

Pregnancy and Diabetes Management: Advances and Controversies

BACKGROUND

The treatment of diabetes in pregnancy has potentially far-reaching benefits for both pregnant women with diabetes and their children and may provide a cost-effective approach to the prevention of obesity, type 2 diabetes mellitus, and metabolic syndrome. Early and accurate diagnosis of diabetes in pregnancy is necessary for optimizing maternal and fetal outcomes.

CONTENT

Optimal control of diabetes in pregnancy requires achieving normoglycemia at all stages of a woman's pregnancy, including preconception and the postpartum period. In this review we focus on new universal guidelines for the screening and diagnosis of diabetes in pregnancy, including the 75-g oral glucose tolerance test, as well as the controversy surrounding the guidelines. We review the best diagnostic and treatment strategies for the pregestational and intrapartum periods, labor and delivery, and the postpartum period, and discuss management algorithms as well as the safety and efficacy of diabetic medications for use in pregnancy.

SUMMARY

Global guidelines for screening, diagnosis, and classification have been established, and offer the potential to stop the cycle of diabetes and obesity caused by hyperglycemia in pregnancy. Normoglycemia is the goal in all aspects of pregnancy and offers the benefits of decreased short-term and long-term complications of diabetes.

The inter- and intragenerational impact of gestational diabetes on the epidemic of type 2 diabetes

OBJECTIVES

We investigated the contribution of gestational diabetes mellitus (GDM) to the historic epidemic of type 2 diabetes mellitus (T2DM) in Saskatchewan.

METHODS

We constructed a population-level simulation model of the inter- and intragenerational interaction of GDM and T2DM for the period 1956 to 2006. The model was stratified by gender, ethnicity, and age; parameterized with primary and secondary data; and calibrated to match historic time series. Risk of diabetes was sigmoidally trended to capture exogenous factors.

RESULTS

Best-fit calibrations suggested GDM may be responsible for 19% to 30% of the cases of T2DM among Saskatchewan First Nations people, but only for approximately 6% of cases among other persons living in Saskatchewan. The estimated contribution of GDM to the growth in T2DM was highly sensitive to assumptions concerning the post-GDM risk of developing T2DM.

CONCLUSIONS

GDM may be an important driver for the T2DM epidemic in many subpopulations. Because GDM is a readily identifiable, preventable, and treatable condition, investments in prevention, rapid diagnosis, and evidence-based treatment of GDM in at-risk populations may offer substantial benefit in lowering the T2DM burden over many generations. Model-informed data collection can aid in assessing intervention tradeoffs.

O-GlcNAc cycling: emerging roles in development and epigenetics

The nutrient-sensing hexosamine signaling pathway modulates the levels of O-linked N-acetylglucosamine (O-GlcNAc) on key targets impacting cellular signaling, protein turnover and gene expression. O-GlcNAc cycling may be deregulated in neurodegenerative disease, cancer, and diabetes. Studies in model organisms demonstrate that the O-GlcNAc transferase (OGT/Sxc) is essential for Polycomb group (PcG) repression of the homeotic genes, clusters of genes responsible for the adult body plan. Surprisingly, from flies to man, the O-GlcNAcase (OGA, MGEA5) gene is embedded within the NK cluster, the most evolutionarily ancient of three homeobox gene clusters regulated by PcG repression. PcG repression also plays a key role in maintaining stem cell identity, recruiting the DNA methyltransferase machinery for imprinting, and in X-chromosome inactivation. Intriguingly, the Ogt gene resides near the Xist locus in vertebrates and is subject to regulation by PcG-dependent X-inactivation. OGT is also an enzymatic component of the human dosage compensation complex. These 'evo-devo' relationships linking O-GlcNAc cycling to higher order chromatin structure provide insights into how nutrient availability may influence the epigenetic regulation of gene expression. O-GlcNAc cycling at promoters and PcG repression represent concrete mechanisms by which nutritional information may be transmitted across generations in the intra-uterine environment. Thus, the nutrient-sensing hexosamine signaling pathway may be a key contributor to the metabolic deregulation resulting from prenatal exposure to famine, or the 'vicious cycle' observed in children of mothers with type-2 diabetes and metabolic disease.

Increased risk of macrosomia among overweight women with high gestational rise in fasting glucose

OBJECTIVES

Maternal overweight is a risk factor for gestational diabetes (GDM) and for newborn macrosomia. Among women without GDM, it is not well understood why some women with high body mass index (BMI) give birth to macrosomic newborns while others do not. We wanted to explore the effect of BMI and fasting plasma glucose (FPG), fasting plasma insulin (FPI) and insulin resistance (HOMA-IR) on the risk of newborn macrosomia.

METHODS

A cohort of 553 Caucasian women was followed throughout pregnancy. The dependent variable was high birth weight (>or=4200 g). Independent variables included gestational age, intake of macronutrients and energy, maternal BMI, weight gain, FPG, FPI and HOMA-IR.

RESULTS

FPG in late pregnancy (30-32 weeks) remained a significant determinant of newborn macrosomia in multiple regression analysis (OR: 1.9, 95% CI: [1.1, 3.4]), whereas FPI and HOMA-IR did not. The women in the highest BMI quartile (>or=27 kg/m(2)) who gave birth to macrosomic newborns had higher increase in FPG and HOMA-IR from early to late pregnancy. Among women in this BMI category, the risk for delivering a macrosomic infant was higher among those with an increase in FPG above 0.60 mmol/l (upper quartile) (OR = 4.5, 95% CI: [1.7, 12.5]).

CONCLUSION

Fasting plasma glucose at week 30-32, but not fasting plasma insulin or insulin resistance, is a determinant of newborn macrosomia. Overweight women with high increase in fasting plasma glucose from early to late pregnancy had a 4.5-fold increase in risk of newborn macrosomia compared to the remaining group with high BMI.