- Research article
- Open Access
Systematic review of the association between dietary patterns and perinatal anxiety and depression
BMC Pregnancy and Childbirth volume 19, Article number: 212 (2019)
Specific dietary factors contribute to greater risks of prenatal and postpartum anxiety and depression. This study aimed to systematically review and assess the evidence regarding the association between dietary patterns and perinatal anxiety and depression (PAAD).
A systematic search of the Latin American & Caribbean Health Sciences Literature (LILACS), PubMed, and Scopus databases for cross-sectional and cohort studies through April 2019 was conducted. The methodological quality of the studies was assessed using the Newcastle-Ottawa scale (NOS) and the Grading of Recommendations Assessment, Development and Evaluation (GRADE) framework was used to assess the quality of evidence.
Ten studies (six cohort and four cross-sectional) were included. All studies had good methodological quality. In these studies, the Western (n = 10), healthy (n = 9), and traditional (n = 7) dietary patterns were examined. The healthy pattern was inversely associated with prenatal and postpartum anxiety and prenatal depression. The traditional Japanese dietary pattern, the traditional Indian-confinement dietary pattern, the United Kingdom traditional dietary and the traditional Brazilian dietary pattern were associated with a lower risk of prenatal depression, postpartum depression, prenatal anxiety and postpartum anxiety, respectively. There was no significant association between a Western dietary pattern and PAAD. The GRADE assessment suggested that the quality of the evidence was very low to low across all outcomes owing to the design, risk of bias, and small sample size.
There is no definitive evidence about the relationship between Western dietary patterns and perinatal anxiety and depression. However, it found an inverse association among the healthy dietary pattern and PAAD. Future studies will be required to better evaluate associations between meal patterns and PAAD. Such studies may provide new insights and assist in the development of new prevention and treatment strategies.
The prenatal and postpartum periods represent highly vulnerable phases for the development of mental disorders owing to the significant physical, hormonal, and emotional changes that occur [1, 2]. Anxiety and depression are mental disorders highly prevalent in these periods and are associated with significant health consequences . A recent systematic review study  reported that the prevalence of perinatal depression was 11.9%, whereas additional work showed the prevalence of prenatal and postpartum anxiety to be 15.2%  and 8.5% , respectively.
The specific factors contributing to the greater risk of PAAD include the absence of the partner or family support, a previous history of mental disorder or domestic violence, alcohol abuse, occurrence of pregnancy complications, changes estradiol and progesterone, and high intake of processed foods with excess sugar and fat content [1, 6,7,8]. One recent investigation showed that the perinatal consumption of a Western-type diet induced postpartum mood disorders, as well as depression-like phenotype and anxiety-like behavior in mice .
Several studies with pregnant women examined the association between nutritional factors and/or food with prenatal and postpartum anxiety and depression [10,11,12]. Data from these studies are important to the identification of specific nutritional factors associated with higher risk of or protection against PAAD. However, these investigations do not provide an adequate assessment of dietary exposure as the intake of individuals is complex and the bioavailability of various nutrients can be influenced by the presence or absence of many dietary factors [13, 14]. To address this disparity, epidemiological researchers have incorporated various statistical techniques to identify specific dietary patterns. This type of approach is essential to evaluate the association between diet (i.e., exposure) and disease (i.e., outcome) as it can address the variety, number, and combinations of foods and beverages consumed by individuals [13, 15, 16].
Assessment of dietary patterns and PAAD is particularly important as changes in eating habits often occur before, during and after pregnancy. During pregnancy, women adopt healthy eating habits to promote fetal development, as well as a better prognosis for childbirth and postpartum outcomes. However, some pregnant women exhibit unhealthy eating behaviors characterized by greater consumption of fast food, soft drinks, and other foods high in sugar and fat [17,18,19].
To date only one systematic review has been conducted to evaluate the association between diet/nutritional supplementation and perinatal depression. This review only included three studies that assessed dietary patterns and pregnancy . There was also no discussion regarding the association between dietary patterns and perinatal anxiety.
The health consequences of PAAD include lower adherence to prenatal care, hypertension , increased health risk behaviors (e.g., alcohol and tobacco abuse) , and adverse neonatal effects (i.e., premature birth and low birth weight) [23, 24]. Thus, the ability to effectively assess of the relationship between dietary patterns and PAAD can represent a significant public health tool. As such, the objective of this systematic review is to evaluate the specific association between eating patterns and PAAD.
This study adhered to PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyzes) . The protocol of the systematic review was recorded in PROSPERO (International Register of Ongoing Prospective Systematic Reviews) (<http://www.crd.york.ac.uk/PROSPERO/>) with CRD 42017069097.
The inclusion criteria used were as follows: 1. cross-sectional and cohort studies without language restriction that included pregnant women, women in the 6 months before pregnancy or 6 months after delivery of any age group; 2. studies that utilized factor analysis, principal component analysis, cluster analysis, reduced rank regression, or treelet transform for the derivation of dietary patterns assessed 6 months before pregnancy and up to 6 months postpartum; and 3. studies that included an assessment of depression and/or anxiety during pregnancy or after delivery. The exclusion criteria used were review articles and studies using dietary indices or scores for the derivation of the dietary patterns.
The virtual search was performed using PubMed, Scopus and LILACS databases. In PubMed and LILACS, the search strategy was: (diet OR diet pattern OR diet patterns OR dietary pattern OR dietary patterns OR eating pattern OR eating patterns OR food pattern OR food patterns) AND (posteriori OR factor analysis OR principal component factor analysis OR principal component analysis OR cluster analysis OR reduced rank regression OR treelet transform) AND (mental health OR mental problems OR mental disorder OR depress* OR anxiety) AND (pregnancy OR gestation OR pregnant OR postnatal OR postpartum OR perinatal OR ante-natal OR post-natal OR post-partum OR peri-natal). The search strategy used in the Scopus database was: TITLE-ABS-KEY (diet OR “diet pattern” OR “diet patterns” OR “dietary pattern” OR “dietary patterns” OR “eating pattern” OR “eating patterns” OR “food pattern” OR “food patterns”) AND TITLE-ABS-KEY (posteriori OR “factor analysis” OR “principal component factor analysis” OR “principal component analysis” OR “cluster analysis” OR “reduced rank regression” OR “treelet transform”) AND TITLE-ABS-KEY (“mental health” OR “mental problems” OR “mental disorder” OR depress* OR anxiety) AND TITLE-ABS-KEY (pregnancy OR gestation OR pregnant OR postnatal OR postpartum OR perinatal OR ante-natal OR post-natal OR post-partum OR peri-natal).
Two review authors (DS, SL) independently screened titles and abstracts from the articles identified through the database searches and subsequently assessed full texts articles to see if they met the eligibility criteria. Disagreements were resolved via consensus.
The data extracted from the studies were entered in Table 1. Data included: name of the authors, year and language of publication, country where the study was conducted, study design, publication period of the article, number and age of participants, food surveys used to evaluate habitual consumption and corresponding statistical technique for the derivation of dietary patterns, identified dietary patterns, and association between dietary patterns and depression and anxiety.
Assessment of methodological quality and risk of bias in the primary study with cohort design was performed using NOS , which included eight items related to selection, comparison, and outcome. For each item a star is awarded (except for comparison) that can receive up to two stars. The studies with six stars (maximum of nine) were classified as good quality. For cross-sectional studies, we used a modified version of NOS  in which studies that received at least five stars (maximum of eight) were classified as good quality.
Summary of evidence was provided for associations between western, healthy and traditional dietary patterns with PAAD. Considering that studies often present different definitions for dietary patterns with a similar food composition, we defined the composition of the Western dietary pattern (independent of the denomination given in the original study) as a diet involving the high intake of meats, processed cereals, high fat foods, and products with high sugar content. In contrast, a healthy dietary pattern consists predominantly of whole foods, fruits, vegetables, fish and seafood, and skimmed milk products. Finally, a traditional dietary patterns was defined as those described by the typical food consumption patterns of the studied regions.
The GRADE framework was used to assess the quality of evidence in regard to the association between dietary patterns with PAAD [38, 39]. GRADE ranks the evidence as: 1. high (there is strong certainty that the association is close to the estimated); 2. moderate (there is moderate certainty in the estimated association); 3. low (certainty in association is limited); and 4. very low (certainty in the association estimate is very limited owing to a significant degree of uncertainty in the findings). The evaluation criteria used for outcomes included the design in which clinical trials were given an A and observational studies a C. The high estimate of the association and overall consistency of the findings also affected the grade. Additionally, the presence of relevant methodological limitations, indirect evidence, and publication bias were all contributing factors that affected the score [38, 39].
The virtual searches recovered a total of 121 studies (90 from PubMed, 31 from Scopus, and 0 from LILACS. There were 23 duplicate records that were excluded, which resulted in 98 abstracts. Following evaluation of the title and abstract, an additional 87 articles were excluded. For the 11 studies that had full-text analysis, 10 met this study’s eligibility criteria and were subsequently included in the review [26,27,28,29,30,31,32,33,34,35]. The flowchart of the selection process is presented in Fig. 1.
The characteristics of included studies are presented in Table 1. The number of participants in each study ranged from 167  to 9530 . The selection period for included studies ranged from 5 weeks of gestation [28, 29, 35] to 3 months postpartum .
Assessment of dietary pattern characteristics
Six studies examined usual dietary intake during pregnancy [26, 27, 30,31,32, 35]. Two studies [28, 29] evaluated 6 months prior to pregnancy, whereas two other studies evaluated in the postpartum period [33, 34]. The survey methods used included a food frequency questionnaire (n = 7) [26,27,28,29,30, 32, 33], food history questionnaire (n = 2) [31, 35], and 3-day food record (n = 1) . For statistical analysis, nine studies used factor analysis [27,28,29,30,31,32,33,34,35] and one used cluster analysis for evaluation of dietary pattern .
The 10 studies included in this review identified food consumption patterns characterized by a Western pattern [26,27,28,29,30,31,32,33,34,35], which was referenced as processed (n = 3) [28,29,30], Western (n = 3), [31, 32, 35], restricted (n = 1) , unhealthy (n = 1) , confectionery (n = 1) , mixed (n = 1) , or Eat-Out diet (n = 1) . Nine studies identified dietary patterns classified as healthy patterns [27,28,29,30,31,32,33,34,35], whereas traditional patterns were identified in seven studies [26, 28,29,30,31, 34, 35] conducted in Brazil (n = 3) [26, 28, 29], the United Kingdom (n = 1) , Japan (n = 2) [31, 35], and Singapore (n = 1) . The food composition for western, healthy, and traditional dietary patterns is presented in Table 2.
Assessment of anxiety and depression characteristics
Assessment of prenatal (n = 2) [26, 30], postpartum (n = 1) , and perinatal (during pregnancy and postpartum – included 30 to 45 days after delivery; n = 1)  anxiety was carried out by four studies. The criteria used for evaluation of anxiety included the State-Trait Anxiety Inventory [28, 34], Primary Care Evaluation of Mental Disorders (PRIME-MD) , and Crown-Crisp Experiential Index . Assessment of prenatal (n = 3) [26, 29, 35], postpartum (8 weeks to 9 months; n = 4) [31,32,33,34], and perinatal (n = 1)  depression/depressive symptoms was conducted in eight studies . The criteria used for the evaluation of depression included the PRIME-MD (n = 1) , and Center for Epidemiologic Studies Depression Scale (n = 1) . The Edinburgh Postnatal Depression Scale (n = 6) [27, 29, 31,32,33,34], was used for evaluation of depressive symptoms.
All cohort studies included in the review showed higher scores than six stars on the NOS scale, which is classified as having good methodological quality [27,28,29, 31, 32, 34]. The cross-sectional studies also exhibited good quality as observed scores were greater than or equal to five stars [26, 30, 33, 35].
Summary of evidence
The summary of the associations between dietary patterns and PAAD is presented in Table 3.
Association between dietary patterns and prenatal depressive symptoms / depression
A Western dietary pattern was positively associated with prenatal depressive symptoms in one study , whereas three other studies [26, 29, 35] reported no statistically significant association. The summary of evidence demonstrated very low quality based on the GRADE framework. In contrast, a healthy dietary pattern was negatively associated with prenatal depressive symptoms/depression in two studies [29, 35]. No other study reported a statistically significant association with a healthy dietary pattern and prenatal depressive symptoms . The summary of evidence also demonstrated very low quality based on the GRADE framework.
There was no significant association between traditional Brazilian dietary pattern and prenatal depressive symptoms/depression in two studies [26, 29]. Another study reported a negative association between traditional Japanese dietary pattern and prenatal depression ,. with very low quality of evidence based on the GRADE framework.
Association between dietary patterns and postpartum depression
The five studies that evaluated the association between a Western dietary pattern and postpartum depression reported no statistically significant association [27, 31,32,33,34]. The summary of evidence demonstrated very low quality based on the GRADE framework. The summary of evidence for the association between a healthy dietary pattern and postpartum depression was evaluated in five studies, but was reported to be inconclusive owing to divergences in the findings [27, 31,32,33,34].
A study by Okubo et al. evaluated the association between a traditional Japanese dietary pattern and postpartum depression. No statistically significant association was observed and the summary of evidence showing very low quality based on the GRADE framework. A traditional Indian-confinement dietary pattern was negatively associated with postpartum depression, whereas a traditional Chinese-confinement dietary pattern reported no statistically significant association with the associations from each traditional dietary pattern exhibiting very low evidence quality, based on the GRADE framework .
Association between dietary patterns and prenatal anxiety
The summary of evidence for the association between a Western dietary pattern and prenatal anxiety was inconclusive. However, a positive association was found in one study , whereas another study found no statistically significant association . A healthy dietary pattern was negatively associated with prenatal anxiety in one study, although the summary of evidence demonstrated very low quality based on the GRADE framework . The relationship between anxiety and a traditional Brazilian dietary pattern showed no significant association . A study that examined the association with a United Kingdom traditional dietary pattern reported a negative association, although the summary of evidence demonstrated very low quality based on the GRADE framework .
Association between dietary patterns and postpartum anxiety
Among the included studies, two evaluated the association between dietary patterns and postpartum anxiety [28, 34]. A healthy dietary pattern [28, 34] and a traditional Brazilian dietary pattern  were both reported to be negatively associated with postpartum anxiety. The summary of evidence for both associations was very low-quality based on the GRADE framework. In contrast, there was no significant association between a Western dietary pattern, a traditional Indian confinement dietary pattern, or traditional-Chinese confinement dietary pattern and postpartum anxiety. The summary of evidence for all three associations was reported as very low quality .
All studies included in this review identified the unhealthy/Western style dietary pattern, characterized by the inclusion of processed meat, refined grains, high-fat foods, and products with high sugar content [26,27,28,29,30,31,32,33,34,35]. This food composition of the Western dietary pattern is quite different from the recommendations for prenatal and postpartum nutrition . This is of concern as perinatal periods have greater nutritional requirements to protect against adverse events for women and the fetuses/neonates. In particular, gestational diabetes, preeclampsia, reduced fetal growth, and low birth weight are of major concern. Several studies reported a positive association between a western dietary pattern and these adverse events [41,42,43].
The summary of evidence of the association between a Western dietary pattern and perinatal anxiety and depressive symptoms/depression showed inconclusive findings or no significant association. These results differ from previously systematic reviews that reported that a western dietary pattern was associated with greater risks of developing depression-related symptoms [44, 45].
A recent meta-analysis by Li et al. was based on 21 studies and revealed a positive association between the Western dietary pattern and depression (i.e., higher risk for depression). However, this analysis  only included one study focused on pregnant women .
Dietary patterns that constituted of whole foods, fruits, vegetables, fish and seafood were characterized as a healthy dietary pattern. Unfortunately, these dietary patterns typically have lower adherence compared to a Western dietary pattern . A healthy diet pattern is associated with positive outcomes for pregnant women, as well as fetuses and neonates. This is evident from a lower risk of gestational diabetes and premature labor [47, 48].
A healthy dietary pattern was negatively associated with prenatal and postpartum anxiety and depression [27,28,29,30, 34, 35]. This was verified by additional systematic reviews that included various age groups that showed health dietary pattern is associated with reduced risk of depression [44, 45].
The dietary patterns that represent the normal food from each country were identified as a traditional dietary pattern. Five traditional patterns were identified: 1. Brazilian (composed in general of beans, rice, beef and eggs) [26, 28, 29]; 2. United Kingdom (included vegetables, beef and chicken) ; 3. Japanese (consisting of rice, miso soup, fish and seafood and pickled vegetables) [31, 35]; 4. Traditional-Chinese-Confinement (characterized by consumption of traditional dried fruits, Chinese herbs, rhizomes, herbal tea, and foods cooked with alcohol, wine, or vinegar) ; and 5. Traditional-Indian-Confinement (composed of ethnic bread, whole milk, Indian herbs, seed herbs, and butter/ghee). These last two dietary patterns are commonly observed in Singapore .
We emphasize the adherence to traditional dietary patterns for each country rather than an unhealthy or western dietary pattern, which is the result of a global food transition that has recently become more apparent . An increased concern regarding this global food transition is justified as the changes typically result in the inclusion and/or greater consumption of foods with high sugar, fat and sodium .
The traditional Japanese dietary pattern and a traditional dietary pattern in Singapore were negatively associated with prenatal and postpartum depression, respectively [34, 35], whereas prenatal and postpartum anxiety were negatively associated with a United Kingdom traditional dietary pattern and traditional Brazilian dietary pattern, respectively [28, 30].
There are multiple factors influencing the development of anxiety and depressive symptoms, which may explain the inconclusive and non-significant associations.
The limitations of this systematic review include 1. heterogeneity among the included studies; 2. different instruments used for the diagnosis of depression / assessment of depressive symptoms and anxiety; 3. variation in the participants and follow-up time for pregnant women; 4. lack of standardization for the definition of dietary patterns. Because of these limitations a meta-analysis could not be used on these data.
Despite these limitations, the evaluation of the methodological quality using specific criteria for cross-sectional and cohort studies, as well as the evaluation of the quality of evidence by the GRADE framework are beneficial outcomes from this study. To our knowledge, this is the first systematic review to exclusively evaluate the association between PAAD and dietary patterns of pregnant women defined using factor analysis or cluster analysis.
There is no definitive evidence about the relationship between Western dietary patterns and perinatal anxiety and depression. However, it found an inverse association among the healthy dietary pattern and PAAD. The traditional Japanese dietary pattern and the traditional-Indian-Confinement dietary pattern were negatively associated with postpartum depression. The United Kingdom traditional dietary pattern was negatively associated with prenatal anxiety, whereas the traditional Brazilian dietary pattern was negatively associated with postpartum anxiety. More high quality studies will be required fully elucidate this relationship, which has significant implications for maternal and fetal health and well-being.
Availability of data and materials
All data generated or analyzed in this study are included in the article.
Grading of Recommendations Assessment, Development and Evaluation
Latin American & Caribbean Health Sciences Literature
Perinatal anxiety and depression
Preferred Reporting Items for Systematic Reviews and Meta-Analyzes
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Silva, D.F.O., Cobucci, R.N., Gonçalves, A.K. et al. Systematic review of the association between dietary patterns and perinatal anxiety and depression. BMC Pregnancy Childbirth 19, 212 (2019). https://0-doi-org.brum.beds.ac.uk/10.1186/s12884-019-2367-7
- Dietary patterns
- Postpartum, PAAD