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Association between eating alone and depressive symptom in elders: a cross-sectional study

Abstract

Background

Depression is one of the main health concerns in elders which could lead to many negative outcomes. Eating alone is an emerging issue in elders in China and would become more serious along with the fast course of industrialization and urbanization, as well as population aging. However, their relationship was seldom researched.

Methods

Using a two-stage cluster sampling strategy, an investigation was conducted in 2014 among 9,361 permanent residents aged 60 years and above in Zhejiang Province, China. Totally, 7,968 cognitively normal elders were included in our analysis. Multilevel logistic regression was used to explore the association between eating arrangement (number of companions in mealtime) and depressive symptom as well as the association between eating alone and depressive symptom in relation to living alone.

Results

In our sample, 17.1 % of the elders ate alone and 8.7 % had depressive symptom. We observed a distinct inverse association between eating arrangement (number of companions in mealtime) and geriatric depressive symptom (female: OR = 1.12, P = 0.027; aged 60–74 years: OR = 1.16, P = 0.002), after adjustment for demography, socioeconomic status, social relation, health behaviors, underlying conditions and living alone. We then introduced a combined variable of eating alone and living alone and examined its relationship with depressive symptom. We found that compared with elders who ate and lived with others, those who ate alone but lived with others had a significant increased odds of depressive symptom (female: OR = 1.62, P = 0.027; aged 60–74 years: OR = 1.59, P = 0.025).

Conclusions

Our results suggested that a lack of companionship in mealtime might be independently associated with geriatric depressive symptom for females and those aged 60–74 years. What’s more, eating alone might be a stronger factor associated with depressive symptom than living alone. We recommend interventions to be performed in encouraging elders especially females and those aged 60–74 years to eat with others. Longitudinal studies in different populations which focus on this topic are required to better understand this issue.

Peer Review reports

Background

One of the main health problems in the elderly population is depression, of which the rate lied between 4.6 and 9.3 % in terms of major depression, and varied from 4.5 to 47.5 % when measured by depressive symptom [14]. Depression could lead to many negative outcomes such as disability, ischemic heart disease and even death [5, 6], greatly affecting life quality of elders and increasing health care cost as well [7].

Several risk factors were found to be related with depression, such as female gender, old age, low-level education, living alone, loneliness and poor social support [1, 3, 4, 811]. However, association on eating arrangement and depression has so far attracted little attention.

Dining is a very important occasion in daily social life in China and many other countries. People who eat meals with others are expected to be benefited from social support in shared mealtime while those who eat alone fail to have this advantage. Eating alone was found to be related with calorie intake, food diversity and overweight [12, 13]. What’s more, a Japanese study found that in elders in Tosa town, those who ate alone had statistically higher scores of depression than those who ate with others, based on the 15-item Geriatric Depression Scale. Further multivariate analysis for this data revealed that eating alone was statistically associated with depression [14]. Another recently published Japanese study also showed that eating alone was a strong factor associated with depressive symptom in elders. Among elders aged 65-74 years and elders aged above 74 years in Kashiwa city, odds ratios of depressive symptom for those who lived with others yet ate alone was 5.02 and 2.41, respectively, compared to their counterparts who lived and ate with others [15]. However, both of the studies were conducted in a confined region in Japan. The evidence on association between eating alone and depression/depressive symptom is very limited in other ethnic or geographical populations.

Like many countries in the rest of the world, China is facing an emerging concern that a large group of elders are now eating alone. What is more, this population would probably further expand in the future due to population aging as well as industrialization and urbanization. Under this circumstance, a better understanding on the relationship between eating alone and geriatric depressive symptom is warranted. Using data from a large-scale investigation in elders in Zhejiang Province, we aimed to explore this association here in the study. Besides, we combined the information of eating alone and living alone, to further discuss the association between eating alone and depressive symptom in relation to living alone.

Methods

Data source

Data were collected in 2014 in six randomly selected counties/districts among a total of 90 in Zhejiang Province, an economically developed province in eastern China. For five counties/districts, one town/subdistrict was further randomly selected in each of them. For one county, which is located in a mountainous area, two towns were randomly selected instead, due to its sparse population. All permanent residents aged 60 years old and above in these selected town/subdistrict were then invited to participate in the investigation. The investigation was approved by the Ethics Committee of Zhejiang Provincial Centre for Disease Control and Prevention. A written consent was acquired from each of the participant. For those who were illiterate, the content was read by the interviewer and signed with the participant’s finger print.

Participants were interviewed face to face based on a self-designed questionnaire by an experienced and previously trained public health practitioner or nurse in a local centre for disease control and prevention or health service centre. Their information of demography, socioeconomic status, social relation, health conditions and behaviors, activity of daily living, cognitive function, living and eating arrangement, food consumption, reproductive history and depressive symptoms was collected. Data were entered by the interviewers and checked by staff at Zhejiang Provincial Centre for Disease Control and Prevention. Missing data and logical errors were fed back to the initial interviewer who would try to reinvestigate the participants to complete the dataset. Totally, 9,361 elders aged 60 years and above responded to the investigation, with a response rate of 76.0 %.

For the 9,361 elders participating in the investigation, those whose information pertaining to any of the following situations were excluded in our analysis: (1) absence of answer in the question of number of persons eating meals together, (2) absence of answers in three or more items in the questions related to depressive symptoms and (3) presence of cognitive impairment. Cognitive function was examined by the mini-mental state examination (MMSE), with a greater score indicating a better cognitive function. Those who were (1) illiterate and scored less than 18, (2) educated in primary school level and scored less than 21 or (3) educated in middle school level or higher and scored less than 25, were considered as cognitive impairment [16].

Finally, 1,393 out of 9,361 participants were excluded, among whom 33 reported no answer to questions of depression or eating arrangement, and 1,360 were considered as cognitive impairment.

Variables of interest

Depressive symptoms were examined by the Patient Health Questionnaire-9 (PHQ-9). Participants were asked by the question of how often in the past two weeks were they troubled by the nine depressive symptoms described in the PHQ-9. Each question had a four-category answer (PHQ score 0: never, PHQ score 1: less than a week, PHQ score 2: more than a week, PHQ score 3: nearly every day in the two weeks). Levels of depressive symptom severity were defined as follows: total PHQ score 0 to 4 equals to none depressive symptoms and total PHQ score 5 to 27 equals to presence of depressive symptoms [17, 18].

Eating arrangement (number of companions in mealtime) was measured by the question of how many people were there in your house having meals with you in the last year. Answers were categorized into five groups which were (1) four persons and more, (2) three persons, (3) two persons, (4) one person and (5) eating alone, respectively.

Covariates

Demographic factors (e.g. age, gender and ethnicity) [8, 1921], socioeconomic status (e.g. education, employment status and economic level) [2, 8, 19, 2226], social relation (e.g. marriage and number of children) [2730], health behaviours (e.g. physical activity, drinking and smoking,) [28, 31, 32], medical conditions [19, 20, 23, 25, 33], living alone [9, 23, 34] and limitation in activity of living [35] were found to be related to depressive symptom/depression in previous literatures. Therefore, we introduced relevant data in our analysis and treated the following variables as covariates, which were gender, age, education, employment status, perception of economic status, marriage, having a child, smoking, drinking, physical activity, underlying conditions, limitation in activity of daily living and living alone. Detailed definition of perception of economic status, underlying conditions, limitation in activity of daily living and living alone were described as follows.

Perception of economic status was asked in the question of in which level you thought your income was in your residential area. Answers were categorized into three categories which were (1) poor, (2) median and (3) rich. Presence of underlying conditions was identified by participants’ self-report of any of the following diagnoses which were (1) hypertension, (2) diabetes, (3) coronary heart diseases, (4) respiratory diseases and (5) tumors/cancers. Limitation in activity of daily living was determined by the Elderly Activities of Daily Living Scale (EADL) in the Chinese National Standard of Basic Public Health Service [36]. Five activities were included in the EADL, which were eating, bathing, dressing, toilet hygiene and functional mobility. Participants who gave answers of self-dependent to all the above activities were considered as having no limitation in activity of daily living, otherwise were regarded as having limitation in it. Living alone was asked by the question of how many people were there living together with you. Answers were categorized into two groups which were (1) living alone and (2) not alone, respectively.

Data analysis

Variables relevant to demography, socioeconomic status, social relation, health behaviours, medical conditions, living arrangement and activity of daily living were extracted from our dataset and each of them was examined on its association with eating arrangement and with depressive symptom as well. Chi-square tests or Chi-square tests for trend, as appropriate, were used for this univariate analysis. Those variables showing statistical associations with both eating arrangement and depressive symptom, and were not in the pathway between them were regarded as covariates for this association. The covariates were further categorized into six groups which were (1) gender and age, (2) education, employment status and perception of economic status, (3) marriage and having a child, (4) smoking, drinking and physical activity, (5) underlying conditions and (6) living alone.

Taking county/district difference of depressive symptom into account, multilevel logistic regression with random intercept was applied to explore the association between eating arrangement and depressive symptom, adjusted for the six groups of covariates step by step.

To understand the association between eating alone and depressive symptom in relation to living alone, a four-category variable combining information of eating alone and living alone was further introduced by using multilevel logistic analysis. Limitation in activity of daily living was additionally included as a covariate in this model as it met the covariate selection criteria mentioned above.

Based on the previous report of gender and age variance in depression/depressive symptom [1, 19], all models were stratified by gender and age (aged 60–74 years and aged 75 years and above).

Data were analyzed using STATA SE 12. All the statistical tests we reported were two-sided, and P < 0.05 was considered as statistically significant.

Results

Details of study participants’ information were shown in Table 1. The median age of the participants included in the analysis was 67 years old. The gender ratio (male: female) was 1.02. The prevalence of depressive symptom was 8.7 %. The percentage of participants who ate alone was 17.1 % and that of participants who lived alone was 14.5 %. A trend was observed in age group associated with depressive symptom (P < 0.001). Another trend was seen in eating arrangement associated with depressive symptom (P < 0.001). All factors excepting for ethnicity and limitation in activity of daily living were shown to be statistically associated with both depressive symptom and eating arrangement based on Chi square tests (P < 0.05).

Table 1 Characteristics of study participants

Gender-specific multilevel logistic regression models of association between eating arrangement and depressive symptom were shown in Table 2. In model A where only age was controlled, a significant association was seen for both genders (male: OR = 1.19, P = 0.005; female: OR = 1.13. P = 0.010), indicating that decreased number of companions in mealtime were associated with an increased odds of depressive symptom. When additionally adjusted for socioeconomic status (education, employment status and perception of economic status) in model B, OR decreased slightly for both genders (male: OR = 1.15, P = 0.019; female: OR = 1.10. P = 0.032), showing a weaker association. Further adjustment for marriage and having a child in model C seldom changed the association (male: OR = 1.15, P = 0.030; female: OR = 1.11. P = 0.035). Similarly, no obvious change was observed for both genders when additionally adjusted for health behaviors (smoking, drinking and physical activity) in model D and underlying conditions in model E, respectively. Finally in model F when additionally adjusted for living alone which was thought to be a strong confounder, the association for female remained significant (OR = 1.12, P = 0.027) while it failed to reach the statistical significance for male (OR = 1.14, P = 0.052).

Table 2 Multilevel logistic regression models of association between eating arrangement and depressive symptom by gender

Age-specific multilevel logistic regression models of association between eating arrangement and depressive symptom were shown in Table 3. For elders aged 60–74 years, model A (adjusted for gender only) showed a distinct inverse association between eating arrangement and depressive symptom (OR = 1.17, P < 0.001). When additionally adjusted for socioeconomic status in model B, OR decreased to 1.14 (P = 0.001). In model C, model D, model E and model F, where social relation, health behaviours, underlying conditions and living alone were introduced successively, the association did not change obviously and still remained significant (for model F: OR = 1.16, P = 0.002). However, for those aged 75 years and above, all the adjusted models failed to reach the statistical significance (P > 0.05).

Table 3 Multilevel logistic regression models of association between eating arrangement and depressive symptom by age

Gender- and age-specific information of elders eating alone and living alone were shown in Table 4. Tested by the univariate analysis, a prominent association was observed between eating alone and depressive symptom in relation to living alone, for both genders and age groups (P < 0.05).

Table 4 Gender- and age-specific univariate association between eating alone and depressive symptom in relation to living alone

Gender- and age-specific multilevel logistic regression models for the association between eating alone and depressive symptom in relation to living alone were presented in Fig. 1. For elderly females, those who ate alone but lived with others had the highest odds of depressive symptom (OR = 1.62, P = 0.027), compared to those who ate and lived with others (OR = 1.00, reference), those who lived alone but ate with others (OR = 1.28, P = 0.412) and those who ate and lived alone (OR = 1.07, P = 0.712). Similar pattern was seen for elders aged 60–74 years. Those who ate alone but lived with others had the highest odds of depressive symptom (OR = 1.59, P = 0.025), compared to the other three groups of their counterparts. For both elderly males and those aged 75 years and above, no statistical significant result was observed for the association between eating alone and depressive symptom in relation to living alone (P > 0.05).

Fig. 1
figure 1

Gender- and age-specific multilevel logistic regression of association between eating alone and depressive symptom in relation to living alone. Gender- and age-specific multilevel logistic regression model was used to analyse the association between eating alone and depressive symptom in relation to living alone, adjusted for age, gender, education, employment status, perception of economic status, marriage, having a child, smoking, drinking, physical activity, underlying conditions and limitation in activity of daily living. The variable of county/district was treated as the group variable in the multilevel logistic regression model. For each of the four associations displayed in the figure, multilevel logistic regression model was shown to be an improved one compared with logistic regression model, examined by the likelihood ratio test (P < 0.001). Both not alone: eating and living with others. Living alone only: living alone but eating with others. Both alone: eating and living alone. Eating alone only: eating alone but living with others

For each association displayed in Table 2, Table 3 and Fig. 1, the multilevel logistic regression model with random intercept was shown to be an improved one compared with the logistic regression model, tested by likelihood ratio test (P < 0.001).

Discussion

The prevalence of depressive symptom among cognitively normal elders in this cross- sectional study was 8.7 %. This was much lower than those reported in most of the previous studies, which were around 20 % and even higher [19, 37, 38]. The gaps could be largely attributed to the exclusion of elders with cognitive impairment in our analysis, measures of depressive symptoms and differences in population and socio-culture contexts as well. There were 17.1 % elders eating daily meals alone in our sample, higher than the number of living alone (14.5 %). This result accords with our expectation that a non-ignorable group of elders in Zhejiang Province is suffering from eating daily meals alone.

We found a distinct inverse association between eating arrangement (number of companions in mealtime) and depressive symptom, after adjustment for factors like demography, socioeconomic status, social relation, health behaviors, underlying conditions and living arrangement. Similar evidence was found in a Japanese study conducted among 856 elderly people, which revealed that depression was statistically associated with eating alone after adjustment for age, gender, BMI and food diversity (OR = 1.42, 95 % CI:1.00–2.11, P = 0.043) [14]. Other evidence on this topic is yet very rare. Dining is a very important occasion of daily social life in Asia and many other countries, where family members and close ones are supposed to gather together sharing food and emotion. In Chinese tradition, eating with several people (family members, friends and so on) at home is always considered to be “Re Nao”, which means bustling, lively and harmonious. People who eat alone are supposed to get less social support and interaction than those who eat with others. Previous studies in both western and eastern countries have found that loneliness and lack of social support were associated with depression, with feeling of loneliness or lack of social support increasing the likelihood of depression or depressive symptom [3, 10, 11, 3941]. Researcher also found that daily hassles were stronger predictors of psychological symptoms than major life events [42]. Therefore, the association between eating arrangement and depressive symptom we found here could be to some extent attributed to the accumulated negative impact of lonely feeling and social isolation in daily mealtime.

Dislike living arrangement, eating arrangement is not confined by the housing condition: people who live together might choose to eat separately because of different daily schedules or conflicts within the family, whereas people who live separately might eat together because of their willingness to gather and communicate. In our sample, 5.2 % participants ate alone but lived with others. Among those who lived with others, 6.1 % ate alone. Currently, only very few studies looked into the association between eating alone and depressive symptom in relation to living alone. A recent paper displayed an intriguing result that among a sample of 1,856 elders aged 65–94 years in Kashiwa city in Japan, elders who ate alone but lived with others were at the highest risk of exhibiting depressive symptom (64-74: OR = 5.02; 75+: OR = 2.41), when compared with their counterparts who ate and lived with others [15]. We observed a similar result here in this study: compared with those who ate and lived with others, those who lived alone but ate with others and those who ate and lived alone, elders who ate alone but lived with others had the highest odds of depressive symptom. Speculating from this, eating alone might be a stronger factor associated with depressive symptom than living alone. Meanwhile, it was an interesting result that elders who ate alone but lived with others had an even higher odds of depressive symptom than those who ate and lived alone. Explanation to this phenomenon is difficult to make due to the absence of detailed information on eating and living arrangement. One plausible reason we try to surmise is that elders who live alone might get used to eating alone, but elders who live with others might expect to eat with them as well. Therefore, when they fail to do so in reality, they gain more disappointment and loneliness, which might deteriorate mental health. What’s more, combative relationship and housing constraint might be the main reason for elders living with others but eating alone. The negative effect of conflict within family might neutralize or even outweigh the benefit of coresidence, and thus might result in a higher odds of depressive symptom than those who ate and lived alone.

Our stratified analysis showed that both the association between eating arrangement and depressive symptom and the one between eating alone and depressive symptom in relation to living alone remained significant in elderly females and elders aged 60-74 years. In the present sample, prevalence of depressive symptom was higher in females than in males, and increased with age, which was coincident with many of the previous studies documenting gaps of depression in gender and age [1, 19]. Compared to men, women are at greater mortality risk when they are in poor social network, which indicates that women might be more dependent on companionship to gain health [43]. Hence we could speculate that a lack of companionship during eating daily meals would affect women’s mental health more greatly than men, which was seen in our analysis.

As for age, an interesting result was seen in our analysis that the association exits in elders aged younger than 75 years rather than those older than 75 years. Some literatures have stated that depressive symptoms might be experienced differently between younger and older adults. It was characterized more of psychological conditions for the younger adults while for the older ones somatic conditions were more prevalent, such as memory complaints and poor sleep quality [1, 44, 45]. Therefore, psychological support such as companionship during eating daily meals might logically help relieve depression in younger elders but not in older ones, as the older ones suffered mainly from somatic symptoms associated with depression. Meanwhile, it could be expected that older elders might have a better adaptation to the situation of being alone due to its longer experience of aging process. They are probably in the condition of being alone longer than the younger ones, and had more time of identity balance which could play a great role in helping them gradually get used to the social isolation. In other words, older elders are not as much sensitive to social support as the younger ones. A similar standpoint was described in a review of depression in elders which pointed that social risk such as poor social support were not as prominent in older adults as in younger ones [22]. Thus the association between depressive symptom and social support like mealtime companionship might be only seen in the younger elders. However, understanding of the result we found here was limited since only a few literatures were retrieved digging deep the age difference in depression. Hence other explanations could not be ruled out. Further in-depth research on the age difference in depressive symptom and its association with eating arrangement is needed.

This data analysis was based on a well-designed study with a large sample size, which brought stability and reliability to results. However, we still have several limitations. First, data were from a cross-sectional survey, thus no causal effect conclusion can be made. However, we measured depressive symptom in the past two weeks while measured eating arrangement in the past year, therefore the temporal relation of the association is more likely to be from eating arrangement to depressive symptom than the opposite way. Second, as a consequence of a retrospective study, recall bias is difficult to avoid. However, participants with cognitive impairment were excluded in our analysis, which at least prevented serious recall bias. Third, our data were drawn form a study of health aging instead of a panel research of eating arrangement and depression. Therefore details of eating arrangement such as who are the companions and information of other potential confounder such as social support are not available. Relevant questions have been added in the questionnaires in 2015, which is expected to explore the association at a much deeper level.

Conclusions

This paper displayed one of the first attempts to explore the gender- and age-specific association between eating alone and depressive symptom in elders as well as its relation to living alone. Our results suggested that a lack of companionship in mealtime might be independently associated with geriatric depressive symptom for females and those aged 60-74 years. What’s more, eating alone might be a stronger factor associated with depressive symptom than living alone. Dislike suggestion of living with others, eating with others is a more feasible intervention that could be introduced in public health action. We hereby suggest that interventions should be performed to encourage elders especially female and those aged 60-74 years to eat with others such as family members, friends and neighbours. Longitudinal studies in different populations which focus on this topic are required to better understand this issue.

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Acknowledgement

This work was supported by the programme for Zhejiang leading team of science and technology innovation (2011R50021). We thank all the field workers for their contribution to the survey.

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Correspondence to Junfen Lin.

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The authors declare that they have no competing interests.

Authors’ contributions

JL, WS and XW designed the study; CW, XZ, YZ, FL and XS conducted the survey; XW, WS, FL and YZ cleaned and analysed the data; FH and YX gave instructions to data analysis; XW, WS, CW, XZ and XS reviewed the literatures; XW drafted the manuscript; WS, CW, XZ, YX, FH and JL critically reviewed the manuscript. All authors read and approved the final version of the manuscript.

Xinyi Wang, Wei Shen and Chunmei Wang contributed equally to this work.

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Wang, X., Shen, W., Wang, C. et al. Association between eating alone and depressive symptom in elders: a cross-sectional study. BMC Geriatr 16, 19 (2016). https://0-doi-org.brum.beds.ac.uk/10.1186/s12877-016-0197-2

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  • DOI: https://0-doi-org.brum.beds.ac.uk/10.1186/s12877-016-0197-2

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