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Govoni L, Ricchi A, Molinazzi MT, Galli MC, Putignano A, Artioli G, Foà C, Palmieri E, Neri I. Breastfeeding pathologies: analysis of prevalence, risk and protective factors. ACTA BIO-MEDICA : ATENEI PARMENSIS 2019; 90:56-62. [PMID: 30977749 PMCID: PMC6625556 DOI: 10.23750/abm.v90i4-s.8240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 02/21/2019] [Indexed: 11/23/2022]
Abstract
BACKGROUND AND AIM OF THE STUDY Breastfeeding is essential for the health of mothers and newborns, and it is recommended by WHO-UNICEF as the sole source of nutrition and protection for the first 6 months of life and beyond. In order to fully promote this practice, it is important to recognize early conditions that can lead to pathological breastfeeding. AIM The study aims to analyze the prevalence and the possible risk or protective factors concerning the pathology of breastfeeding. METHODS For this observational study were consulted the medical records and the files of the Breastfeeding clinic of 1065 puerperal women, of the University Hospital of Modena, from January to August 2016. The data were processed with the SPSS Software. RESULTS In our study population, 532 (50%) puerperal women presented a breastfeeding-related disease, of which 330 (31%) had a disease affecting the mother (breast engorgement, fissures, a-/hypo-galactia, discontinuation of breastfeeding, galactocele, mastitis and candidiasis), 105 (9.9%) of the newborn (inadequate suction, neonatal jaundice, pathological weight loss, need for admission to NICU) and 97 (9.1%) of both the mother and the newborn. DISCUSSIONS It is evident from the results that the predicting factors of pathology in breastfeeding are present in pregnant women who give birth in an early gestational age and with high age, birth rate and nationality. CONCLUSIONS staff training courses are essential to respond to WHO-UNICEF recommendations and to improve the continuity of care for the mother-child dyad.
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Association of age and colostrum discarding with breast-feeding practice in Ethiopia: systematic review and meta-analyses. Public Health Nutr 2019; 22:2063-2082. [PMID: 30846022 DOI: 10.1017/s1368980019000314] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
OBJECTIVE To investigate whether maternal/caregiver's age, infant age (0-6 months) and discarding colostrum affects timely initiation of breast-feeding (TIBF) and exclusive breast-feeding (EBF) in Ethiopia. DESIGN A systematic search of PubMed, SCOPUS, EMBASE, CINHAL, Web of Science and WHO Global Health Library electronic databases was done for all articles published in English from 2000 to January 2018. Two reviewers independently screened, extracted and graded the quality of studies using Newcastle-Ottawa Scale. A weighted inverse-variance random-effects model meta-analysis, cumulative meta-analysis and mixed-effects meta-regression analysis were done. SETTING All observational studies conducted in Ethiopia.ParticipantsMothers of children aged less than 2 years.ResultA total of forty articles (fourteen studies on TIBF and twenty-six on EBF) were included. TIBF was associated with colostrum discarding (OR=0·38; 95 % CI 0·21, 0·68) but not with maternal/caregiver's age (OR=0·98; 95 % CI 0·83, 1·15). In addition, colostrum discarding (OR=0·53; 95 % CI 0·36, 0·78) and infant age (OR=1·77; 95 % CI 1·38, 2·27) were significantly associated with EBF but not maternal/caregiver's age (OR=1·09; 95 % CI 0·84, 1·41). CONCLUSIONS There was no association between maternal/caregiver's age and breast-feeding practice (EBF and TIBF). Colostrum discarding was associated with both EBF and TIBF. This evidence could be helpful to counsel all mothers of reproductive age and who discard colostrum.
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Do a Few Weeks Matter? Late Preterm Infants and Breastfeeding Issues. Nutrients 2019; 11:nu11020312. [PMID: 30717261 PMCID: PMC6413139 DOI: 10.3390/nu11020312] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 01/27/2019] [Accepted: 01/29/2019] [Indexed: 12/17/2022] Open
Abstract
The late preterm infant population is increasing globally. Many studies show that late preterm infants are at risk of experiencing challenges common to premature babies, with breastfeeding issues being one of the most common. In this study, we investigated factors and variables that could interfere with breastfeeding initiation and duration in this population. We conducted a prospective observational study, in which we administered questionnaires on breastfeeding variables and habits to mothers of late preterm infants who were delivered in the well-baby nursery of our hospital and followed up for three months after delivery. We enrolled 149 mothers and 189 neonates, including 40 pairs of twins. Our findings showed that late preterm infants had a low rate of breastfeeding initiation and early breastfeeding discontinuation at 15, 40 and 90 days of life. The mothers with higher educational levels and previous positive breastfeeding experience had a longer breastfeeding duration. The negative factors for breastfeeding were the following: Advanced maternal age, Italian ethnicity, the feeling of reduced milk supply and having twins. This study underlines the importance of considering these variables in the promotion and protection of breastfeeding in this vulnerable population, thus offering mothers tailored support.
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Prepregnancy obesity as a risk factor for exclusive breastfeeding initiation in Japanese women. Nutrition 2018; 62:93-99. [PMID: 30856400 DOI: 10.1016/j.nut.2018.11.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Revised: 09/02/2018] [Accepted: 11/19/2018] [Indexed: 11/22/2022]
Abstract
OBJECTIVES Breastfeeding rates in many countries fall short of the World Health Organization's recommendations. It has been reported that exclusive breastfeeding (EBF) is negatively associated with obesity; however, the association varies with ethnicity, and little information is available from Asia. We explored whether prepregnancy body mass index (BMI) and gestational weight gain (GWG) were associated with initiation of EBF. METHODS We investigated 6125 Japanese women with full-term (37-42 wk of gestation) singleton babies between January 2010 and June 2013, in a hospital with the largest annual number of deliveries in Tokyo, Japan. RESULTS Successful EBF initiation was observed in 72% of women 1 mo after delivery. The average GWG was 10 kg in underweight (BMI < 18.5 kg/m2) and normal weight (BMI 18.5-24.9 kg/m2) women; 7 kg in overweight (BMI 25-29.9 kg/m2) women, and 4 kg in obese (BMI ≥ 30 kg/m2) women. After adjusting for covariates, stepwise modeling revealed that compared with women of normal weight, obesity (odds ratio [OR], 0.29; 95% confidence interval [CI], 0.16-0.53), and a single-unit increase in the GWG (OR, 0.98; 95% CI, 0.96-1.00) were significantly associated with unsuccessful EBF initiation. No statistical interaction was evident between prepregnancy BMI and GWG. Other significant risk factors for unsuccessful EBF initiation included older maternal age (P < 0.001), nulliparity (P < 0.001), cesarean delivery (P < 0.001), an earlier gestational week (P < 0.001), a light-for-date infant (P < 0.05), and mother-child separation for clinical reasons (P < 0.001). CONCLUSIONS This study suggested that prepregnancy obesity is a risk factor for EBF initiation among Japanese women.
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Ardura-Garcia C, Pedersen ESL, Goutaki M. The limitations of cross-sectional data: perinatal risk factors for asthma. Eur Respir J 2018; 52:52/3/1801197. [PMID: 30190261 DOI: 10.1183/13993003.01197-2018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 06/28/2018] [Indexed: 11/05/2022]
Affiliation(s)
| | - Eva S L Pedersen
- Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland
| | - Myrofora Goutaki
- Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland.,Paediatric Respiratory Medicine, University Children's Hospital, University of Bern, Bern, Switzerland
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Little SH, Fetters MD. Transcultural Modifications of a Japanese Language Group Prenatal Care Program for Transcultural Adaptation. J Transcult Nurs 2018; 30:106-114. [PMID: 29969953 DOI: 10.1177/1043659618785230] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
INTRODUCTION The CenteringPregnancy model has been demonstrated to improve birth outcomes for certain cultural and ethnic groups, but the literature lacks examples on how to modify their guidelines for socioculturally isolated women. Our aim is to examine the modifications we made to the CenteringPregnancy group prenatal care for Japanese women and to examine the implications for transcultural modification. METHODS Using a descriptive case study design, we examined the cultural fit and modifications of our Japanese prenatal group approach. We report the aspects that do not require modifications and the transcultural modifications that are needed. Based on this descriptive case, we discuss the lessons learned for making transcultural modifications that may apply to other cultural groups. RESULTS Many aspects of the CenteringPregnancy were readily adopted. We made 10 substantive transcultural modifications and articulate considerations for transcultural modifications. DISCUSSION/CONCLUSION This research illustrates transcultural considerations for modifying the CenteringPregnancy model and provides implications for use in other isolated populations of pregnant women.
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Nomura K, Kodama H, Kido M. [Nutritional Status of Japanese Women of Childbearing Age and the Ideal Weight Range for Pregnancy]. Nihon Eiseigaku Zasshi 2018; 73:85-89. [PMID: 29386453 DOI: 10.1265/jjh.73.85] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
According to the recent 2015 Nutrition Survey, the prevalence of being underweight (Body Mass Index, BMI <18.5 kg/m2) among women in their 20s is 22.3%. Women of childbearing age tend to have a lower intake of protein and their total energy intake is lower than the requirements established by the 2015 Dietary Reference Intakes for Japanese. There is a growing body of evidence showing that underweight women tend to bear small babies and that these babies have an increased risk of diabetes or cancer in their adulthood. In order to prevent Japanese women from bearing small babies, the literature has suggested that women of childbearing age should be encouraged to remain at a normal weight before pregnancy. For optimal weight gain during pregnancy, existing guidelines recommend different ranges of weight gain based on prepregnancy BMI. Owing to the absence of official GWG recommendations in Asian countries, including China and Taiwan, the US Institute of Medicine (IOM) guidelines are generally followed. However, Asian women are smaller and experience lower weight gains; therefore, excessive weight gain may lead to harmful events including macrosomia, preterm birth, preeclampsia, gestational diabetes, pregnancy-induced hypertension, and short- and long-term postpartum weight retention. Thus, an accurate GWG range should be determined for Asian women. We introduce one epidemiological study in which the optimal weight gain range was investigated by analyzing receiver-operating characteristic curves together with potential research ideas in this field with the aim of encouraging young researchers to solve this public health problem affecting mothers and children.
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Affiliation(s)
- Kyoko Nomura
- Department of Public Health, Akita University Graduate School of Medicine
| | - Hiroko Kodama
- Teikyo Heisei University, Faculty of Medical Health, Department of Health and Nutrition
| | - Michiko Kido
- Japanese Red Cross Medical Center, Obstetrics, Gynecology
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Breastfeeding Determinants in Healthy Term Newborns. Nutrients 2018; 10:nu10010048. [PMID: 29304013 PMCID: PMC5793276 DOI: 10.3390/nu10010048] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Revised: 12/28/2017] [Accepted: 01/03/2018] [Indexed: 11/18/2022] Open
Abstract
Breastfeeding is the normative standard for infant feeding. Despite its established benefits, different factors can affect breastfeeding rates over time. The purpose of this study was to evaluate breastfeeding determinants in healthy term newborns during the first three months of life. A prospective, observational, single-center study was conducted in the nursery of Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico in Milan, Italy. The mother-baby dyads that were admitted to the Clinic in January and February 2017 were enrolled. Only healthy term babies with birth weight ≥10th percentile for gestational age were included. Data were collected through medical records and questionnaires administered during the follow-up period. Then, we fitted univariate and multivariate logistic models and calculated odds ratios. 746 dyads were included but 640 completed the study. The factors found to be favoring breastfeeding were a previous successful breastfeeding experience, a higher level of education of the mother, attending prenatal classes, no use of pacifier, rooming in practice, and breastfeeding on demand. Factors acting negatively on breastfeeding were advanced maternal age, non-spontaneous delivery, perception of low milk supply, mastitis, and nipple fissures. This study highlights the need to individualize the assistance provide to breastfeeding mothers, paying special attention to personal experiences.
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Khasawneh W, Khasawneh AA. Predictors and barriers to breastfeeding in north of Jordan: could we do better? Int Breastfeed J 2017; 12:49. [PMID: 29234457 PMCID: PMC5721388 DOI: 10.1186/s13006-017-0140-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 11/28/2017] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Despite the ongoing recommendations for breastfeeding, we continue to see a decrease in exclusive breastfeeding among Jordanian women during infant follow up visits at the pediatric outpatient clinic. The purpose of our study is to determine the prevalence, predictors and barriers to exclusive breastfeeding in north of Jordan. METHODS We conducted a cross-sectional survey involving mothers with infants six to twelve months old, at two hospitals in Irbid city in north of Jordan, between December 2016 and March 2017. Questions included demographics, feeding pattern, and reasons for non-exclusive breastfeeding. RESULTS Five hundred women were included. Twenty four percent of women were employed and 87% initiated breastfeeding within three hours of birth. The proportion of women with any breastfeeding and exclusive breastfeeding at six months was 76 and 33%. After multivariate logistic regression analysis, predictors of exclusive breastfeeding at six months include the mother's previous experience (Adjusted Odds Ratio [AOR] 7.9, 95% CI 4.69, 13.36) and multiparity (AOR 2.26, 95% CI 1.2, 4.28), while barriers include maternal employment (AOR 0.4, 95% CI 0.22,0.72), Cesarean delivery (AOR 0.55, 95% CI 0.35, 0.86) and infant's hospitalization (AOR 0.44, 95% CI 0.23,0.82). Inadequate breastmilk supply and short maternity leave were the main reported reasons for non-exclusive breastfeeding. CONCLUSIONS In north of Jordan, the majority of women initiate breastfeeding, half practice exclusive breastfeeding after birth while one third continue for six months, particularly those with previous experience. Cesarean delivery and infant's hospitalization, together with maternal employment are among the main barriers. Implementing educational programs and lactation consultant counselling together with work environment support, should be helpful to improve the breastfeeding practice among Jordanian women.
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Affiliation(s)
- Wasim Khasawneh
- Department of Pediatrics, Jordan University of Science and Technology, PO Box 3030, Irbid, 22110 Jordan
| | - Ayat Abdelrahman Khasawneh
- Department of Community Medicine, Jordan Royal Medical Services, Prince Rashid Military Hospital, Aidoun, Irbid, 22110 Jordan
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Abstract
BACKGROUND Lactogenesis II is the onset of copious milk production. A delay in this has been associated with an increased risk of formula supplementation and early cessation of breastfeeding. Prepregnancy obesity has also been associated with decreased breastfeeding rates and early cessation. Research aim: This study aimed to evaluate the effect of prepregnancy obesity on self-reported delayed lactogenesis II. METHODS We conducted a prospective observational cohort study of 216 women with a singleton pregnancy and who planned to breastfeed. We compared the onset of lactogenesis II between women with a body mass index (BMI) < 30 kg/m2 and women with a BMI ≥ 30 kg/m2. Using multivariate logistic regression analyses, we assessed the relationship between maternal BMI and delay of lactogenesis II. RESULTS The prevalence of delayed lactogenesis II among women with prepregnancy BMI < 30 kg/m2 and BMI ≥ 30 kg/m2 was 46.4% and 57.9%, respectively. Delayed lactogenesis II occurred more frequently among women who were obese at the time of delivery ( p < .05). After controlling for the covariates, age, prepregnancy BMI, and gestational weight gain were positively associated with delayed lactogenesis II. CONCLUSION Prepregnancy obesity and excessive gestational weight gain are associated with an increased risk of delayed lactogenesis II. Women who are at risk for delay in lactogenesis II and early breastfeeding cessation will need targeted interventions and support for them to achieve their personal breastfeeding goals.
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Affiliation(s)
- Irma Preusting
- 1 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of South Florida, Tampa, FL, USA.,2 Faculty of Medical Sciences, University of Groningen, Groningen, The Netherlands
| | - Jessica Brumley
- 1 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of South Florida, Tampa, FL, USA
| | - Linda Odibo
- 1 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of South Florida, Tampa, FL, USA
| | - Diane L Spatz
- 3 University of Pennsylvania School of Nursing, Philadelphia, PA, USA.,4 Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Judette M Louis
- 1 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of South Florida, Tampa, FL, USA
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Linares AM, Wambach K, Rayens MK, Wiggins A, Coleman E, Dignan MB. Modeling the Influence of Early Skin-to-Skin Contact on Exclusive Breastfeeding in a Sample of Hispanic Immigrant Women. J Immigr Minor Health 2017; 19:1027-1034. [PMID: 26969615 PMCID: PMC5018413 DOI: 10.1007/s10903-016-0380-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Using data from a longitudinal study of breastfeeding in Hispanics, this study evaluated the influence of early skin-to-skin contact (SSC) on initiation and sustained exclusive breastfeeding (EBF) at 1 month postpartum. Two-thirds of the women in the sample participated in early SSC. At discharge, over half of the women were EBF; this proportion decreased to one-third at 1 month postpartum. Controlling for demographic and clinical variables in the model, participation in early SSC was associated with a greater than sevenfold increase in the odds of EBF at discharge (p = .005) but was not predictive of EBF at 1 month post-discharge (p = .7). Younger maternal age and increased prenatal infant feeding intention were associated with an increased likelihood of EBF across both timepoints. Promoting early SSC may help with initiation of EBF, while further breastfeeding support may be needed to maintain EBF following discharge for this vulnerable population.
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Affiliation(s)
- Ana M. Linares
- College of Nursing, University of Kentucky, Faculty of Health Science, Universidad de Tarapaca, Arica, Chile. 315 College of Nursing Building, University of Kentucky, Lexington, KY, 40536-0230, USA
| | - Karen Wambach
- School of Nursing, University of Kansas, Kansas City, KUMC,
| | - Mary K. Rayens
- College of Nursing and College of Public Health, University of Kentucky,
| | | | | | - Mark B. Dignan
- Department of Internal Medicine and Director of the University of Kentucky, Prevention Research Center,
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Infant feeding decisions and behaviours among low-income smoke-exposed women: timing and change during pregnancy. Public Health Nutr 2017; 20:2796-2805. [DOI: 10.1017/s1368980017001690] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
AbstractObjectiveThe present study aimed to describe change in feeding intentions and predictors of breast-feeding intentions during the course of pregnancy.DesignAnalysis of prospectively collected data from a larger randomized controlled trial of a health education intervention to reduce environmental smoke exposure among women during and after pregnancy.SettingParticipants were recruited from prenatal clinics, but all further communication occurred with participating women living in the community.SubjectsLow-income, adult women (n399) were interviewed during the 16th and 32nd week of pregnancy to ascertain prenatal feeding intentions and breast-feeding knowledge, attitudes and self-efficacy. Characteristics of women by infant feeding intention were assessed along with differences in intention from 16 to 32 weeks of pregnancy and feeding behaviours after delivery. Differences in psychosocial variables between women of different intention for infant feeding were measured. Women in each category of feeding intention were assessed for changes in psychosocial factors by eventual infant feeding behaviour.ResultsFeeding intention early in pregnancy was strongly, but not consistently, associated with feeding intention late in pregnancy, feeding initiation and later feeding patterns. Over one-third of women who were undecided at 16 weeks’ gestation or earlier initiated breast-feeding. Increases in knowledge and improvement in time, social factors and social support barriers were found among those who exclusively breast-fed.ConclusionsResults indicate that feeding decisions may change during pregnancy. Determining when women make feeding decisions during their pregnancy warrants more research. Interventions to increase breast-feeding intentions should target knowledge, self-efficacy and barriers.
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Hartwig FP, Loret de Mola C, Davies NM, Victora CG, Relton CL. Breastfeeding effects on DNA methylation in the offspring: A systematic literature review. PLoS One 2017; 12:e0173070. [PMID: 28257446 PMCID: PMC5336253 DOI: 10.1371/journal.pone.0173070] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Accepted: 02/14/2017] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Breastfeeding benefits both infants and mothers. Recent research shows long-term health and human capital benefits among individuals who were breastfed. Epigenetic mechanisms have been suggested as potential mediators of the effects of early-life exposures on later health outcomes. We reviewed the literature on the potential effects of breastfeeding on DNA methylation. METHODS Studies reporting original results and evaluating DNA methylation differences according to breastfeeding/breast milk groups (e.g., ever vs. never comparisons, different categories of breastfeeding duration, etc) were eligible. Six databases were searched simultaneously using Ovid, and the resulting studies were evaluated independently by two reviewers. RESULTS Seven eligible studies were identified. Five were conducted in humans. Studies were heterogeneous regarding sample selection, age, target methylation regions, methylation measurement and breastfeeding categorisation. Collectively, the studies suggest that breastfeeding might be negatively associated with promoter methylation of LEP (which encodes an anorexigenic hormone), CDKN2A (involved in tumour suppression) and Slc2a4 genes (which encodes an insulin-related glucose transporter) and positively with promoter methylation of the Nyp (which encodes an orexigenic neuropeptide) gene, as well as influence global methylation patterns and modulate epigenetic effects of some genetic variants. CONCLUSIONS The findings from our systematic review are far from conclusive due to the small number of studies and their inherent limitations. Further studies are required to understand the actual potential role of epigenetics in the associations of breastfeeding with later health outcomes. Suggestions for future investigations, focusing on epigenome-wide association studies, are provided.
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Affiliation(s)
- Fernando Pires Hartwig
- Postgraduate Programme in Epidemiology, Federal University of Pelotas, Pelotas, Brazil
- MRC Integrative Epidemiology Unit, School of Social & Community Medicine, University of Bristol, Bristol, United Kingdom
- * E-mail:
| | | | - Neil Martin Davies
- MRC Integrative Epidemiology Unit, School of Social & Community Medicine, University of Bristol, Bristol, United Kingdom
- School of Social and Community Medicine, University of Bristol, United Kingdom
| | - Cesar Gomes Victora
- Postgraduate Programme in Epidemiology, Federal University of Pelotas, Pelotas, Brazil
| | - Caroline L. Relton
- MRC Integrative Epidemiology Unit, School of Social & Community Medicine, University of Bristol, Bristol, United Kingdom
- School of Social and Community Medicine, University of Bristol, United Kingdom
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