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The impact of sugar-sweetened beverages consumption on constipation: evidence from NHANES

樱花视频 volume听25, Article听number:听1126 (2025) Cite this article

Abstract

Background

The consumption of sugar-sweetened beverages (SSBs) has increased substantially over recent decades, raising concerns about its various physiological effects on bodily function. However, the relationship between SSBs intake and constipation remains insufficiently understood.

Methods

Data from 7,979 participants sourced from the National Health and Nutrition Examination Survey (NHANES) were analyzed in this study. Dietary intake of SSBs was assessed using two 24-hour dietary recall interviews, and constipation was defined according to the Bristol Stool Form Scale (BSFS) Cards. We employed weighted logistic regression analysis to examine the relationship between SSBs consumption (quantified in grams and kilocalories) and the risk of constipation, while stratified and restricted cubic spline (RCS) analyses explored population variability.

Results

After adjusting for all relevant variables, SSBs quantified in grams (SSBs-grams) (ORQ3 vs. Q1 = 1.419, 95% CI: 1.064鈥�1.893, p鈥�=鈥�0.019; p for trend鈥�=鈥�0.02) and SSBs quantified in kilocalories (SSBs-kcal) (ORQ4 vs. Q1 = 1.567, 95% CI: 1.100-2.234, p鈥�=鈥�0.015; p for trend鈥�=鈥�0.016) showed a significant positive association with constipation. Furthermore, the weighted RCS and stratified analyses indicated that the association varied among subgroups, with a non-linear relationship between SSBs-kcal and constipation (SSBs-grams: p non-linear鈥�=鈥�0.100, SSBs-kcal: p non-linear鈥�=鈥�0.026).

Conclusions

Our findings indicated that increased SSBs consumption is associated with a higher risk of constipation. The results underscore the need for public health interventions aimed at reducing the intake of SSBs and promoting healthier alternatives.

Peer Review reports

Background

Bowel symptoms, including abdominal pain, diarrhea, constipation, bloating, and changes in bowel habits, are characterized by manifestations associated with intestines [1, 2]. Among these, constipation emerges as the most prevalent, particularly for the elderly. It is defined by three criteria: defecation frequency, stool consistency, and defecation difficulty [3, 4], with constipation specifically indicated by fewer than three bowel movements per week. Defecation frequency is influenced by a multitude of factors, including dietary habits, physical activity levels, age, and others, leading to significant individual variability. Thus, defining constipation by considering bowel movement frequency and other influencing factors is essential. Constipation is commonly characterized by stools that are lumpy, hard, dry, nutty, or granular, along with a reduced frequency of bowel movements. It is frequently accompanied by difficulties and discomfort during defecation, anal obstruction, and sometimes anal fissures with bleeding. The Global prevalence of constipation varies considerably [3, 5], with a reported 16% in North America [6], which increases with age and other factors. Constipation widespread health issue affecting physical well-being and imposing a significant economic burden on individuals and communities [7]. In the United States, chronic constipation accounts for approximately 3听million healthcare visits annually, with the associated all-cause costs reaching up to $12,000 per patient yearly. Chronic constipation is often linked to a wide range of complications [8, 9] affecting multiple organs and systems, including gastrointestinal issues like dysfunction, inflammation, obstruction, anal fissures, and hemorrhoids, as well as extra-gastrointestinal complications like obesity, cognitive disorders, myocardial and cerebral infarctions, and depression. The development of constipation is influenced by numerous factors [7, 10, 11], such as dietary factors, physical inactivity, sedentary lifestyles, advanced age, environmental influences, alcohol consumption, anxiety, depression, and medication side effects. Among these, dietary factors [12, 13] are strongly associated with constipation. Various dietary interventions have been developed to address constipation [14]. Studies have demonstrated that low-carbohydrate and low-fat diets effectively manage intestinal disorders and relieve constipation symptoms through dietary modifications. Dietary interventions for the prevention of intestinal diseases represent a direct, feasible, cost-effective, and efficient strategy for disease prevention and management via tailored dietary components.

In this study, 鈥渟ugar-sweetened beverages (SSBs)鈥� refers to any beverages sweetened with any form of sugar, including sucrose, corn sugar, corn syrup, and fruit juice concentrate, among others [15]. These include soft drinks, fruit drinks (not 100%), sports and energy drinks, nutritional beverages, smoothies, grain drinks, bottled water, carbonated water, and sweetened coffee and tea, which are major sources of dietary added sugars [16, 17]. SSBs account for approximately 24% of the added sugar intake in the United States [18]. Their consumption has imposed a substantial burden on individuals and society nationwide, posing a major global public health challenge [19, 20]. Long-term SSBs consumption adversely affects individual health and undermines the overall health of the population. Notably, the consumption of SSBs in the United States has declined over the past decade [21], partly due to regulatory measures limiting SSBs intake in various countries [22]. However, consumption has risen over the past 30 years [23], resulting in an increased burden on society. Numerous studies have established associations between SSBs and various diseases, including cardiovascular disease [24, 25] (encompassing cardiometabolic risk factors and cardiovascular disease mortality), obesity [26], metabolic syndrome [27], type 2 diabetes [28, 29], skeletal muscle disorders (e.g., gout, hyperuricemia) [30], and non-alcoholic fatty liver disease [15]. Additionally, the impact of SSBs on intestinal disorders has been extensively investigated. Evidence has demonstrated an association between SSBs consumption and inflammatory bowel disease (IBD) risk [31]. High sugar intake and SSBs consumption are linked to a higher prevalence of IBD and increased incidence of adverse cardiovascular outcomes in patients with IBD [32]. However, the potential association between SSBs and constipation remains unexplored.

In this article, we analyzed data extracted from the National Health and Nutrition Examination Survey (NHANES) to characterize individuals鈥� constipation. The weighted multivariable logistic regression was used to investigate the association between the SSBs, quantified in grams (SSBs-grams) and kilocalories (SSBs-kcal), and the prevalence of constipation. Additionally, we also performed restricted cubic spline (RCS) and stratified analyses to further evaluate the non-linear relationships and explore the effect modification by age, gender, drinking status, and diet quality. Insights gained from this research may inform dietary guidelines and public health interventions aimed at reducing the risk of constipation.

Materials and methods

Data source

The National Health and Nutrition Examination Survey (NHANES) is a public health research program conducted by the National Center for Health Statistics (NCHS) [33]. Its main goal is to assess the health status of adults and children in the United States through periodic cross-sectional surveys that evaluate health and nutrition. NHANES releases a wide range of data biennially, including demographic, dietary, examination, laboratory, questionnaire, and limited access data. All participants in NHANES have provided informed consent, and the study protocol was approved by the NCHS Ethics Review Board (ERB) (continuation of Protocol #2005-06). As a comprehensive and representative health survey in the United States, NHANES offers extensive and reliable cross-sectional data, supporting clinical research and informing policy decisions.

Study population

We initially extracted data for 20,686 individuals from the 2007鈥�2010 NHANES cycles. Participants were excluded based on the following criteria: (1) age鈥�<鈥�20 years (n鈥�=鈥�8,533); (2) self-reported colorectal cancer history (n鈥�=鈥�104); (3) pregnancy (n鈥�=鈥�126); (4) missing bowel health questionnaire data (n鈥�=鈥�1,756); (5) missing SSBs intake data (n鈥�=鈥�160); or (6) missing relevant covariates (n鈥�=鈥�2,028). The final analyses included a total of 7,979 participants (Fig.听1).

Fig. 1
figure 1

Flow chart of the participants in NHANES from 2007 to 2010. Abbreviations: NHANES, the National Health and Nutrition Examination Survey; SSBs, sugar-sweetened beverages

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Sugar-sweetened beverage intake

Dietary intake was measured using two 24-hour dietary recalls. The first dietary recall interview was conducted in person at the Mobile Examination Center (MEC), and the second was obtained via telephone 3鈥�10 days later [34]. All dietary data were coded according to the United States Department of Agriculture (USDA) Food and Nutrient Database for subsequent analysis. SSBs included soft drinks, fruit drinks, sports and energy drinks, nutritional beverages, smoothies, grain drinks, bottled water, carbonated water, and sweetened coffee and tea [35, 36]. We excluded 100% fruit juice, unsweetened milk, sweetened milk, and other beverages based on the defined criteria. SSBs intake was quantified both in grams (SSBs-grams) and kilocalories (SSBs-kcal) and subsequently categorized into quartiles for analysis: quartile 1 (0.000鈥�0.000), quartile 2 (0.000-367.200), quartile 3 (367.200-770.325), and quartile 4 (770.325-10056.69) for SSBs-grams; and quartile 1 (0鈥�0), quartile 2 (0鈥�74), quartile 3 (74鈥�246), and quartile 4 (246鈥�4124) for SSBs-kcal.

Diagnosis of constipation

According to the definition of the Bristol Stool Form Scale (BSFS), stool traits could be categorized into seven types: type 1 (separate hard lumps, like nuts), type 2 (sausage-like, but lumpy), type 3 (like a sausage but with cracks in the surface), type 4 (like a sausage or snake, smooth and soft), type 5 (soft blobs with clear-cut edges), type 6 (fluffy pieces with ragged edges, a mushy stool), and type 7 (watery, no solid pieces). Participants reporting stool types 1 and 2 were defined as having constipation [37, 38].

Covariates

This study included the following covariates: age (20鈥�39, 40鈥�64, and 鈮モ��65 years), gender (female and male), race (non-Hispanic white, non-Hispanic black, Mexican American, and other), body mass index (BMI) (<鈥�25听kg/m2, 25鈥�29听kg/m2, and 鈮モ��30听kg/m2), poverty-income ratio (PIR) (<鈥�1, 1-1.99, 2-3.99, and 鈮モ��4), educational level (more than high school, high school, and less than high school), marital status (live together and live alone), drinking status, smoking status, dietary intake (energy, sugar, moisture, fat, and protein), physical activity levels, presence of hypertension, diabetes, depression, and the Healthy Eating Index-2015 (HEI-2015) scores (<鈥�50 and 鈮モ��50) [37]. Drinking status was categorized as yes (mild, moderate, or heavy drinkers) and no (former or never drinkers). Specifically, the categories 鈥渘ever鈥�, 鈥渇ormer鈥�, 鈥渕ild鈥�, 鈥渕oderate鈥�, and 鈥渉eavy鈥� were defined as follows: never referred to participants who had consumed鈥�<鈥�12 drinks in a lifetime; former included participants who had consumed鈥夆墺鈥�12 drinks in a year but did not drink last year; mild pertained to participants who consumed鈥�>鈥�2 drinks per day for men or >鈥�1 drink per day for women in the past 12 months; moderate was defined by participants who consumed鈥�>鈥�3 drinks per day for men or >鈥�2 drinks per day for women in the past 12 months or 2鈥�5 drinks overall; heavy was characterized by participants who consumed鈥�>鈥�4 drinks per day for men or >鈥�3 drinks per day for women in the past 12 months, or 鈮モ��5 drinks overall. One drink was defined as a 12-ounce of beer, a 5-ounce glass of wine, or 1.5 ounces of liquor. Smoking status was divided into now (smoked鈥�>鈥�100 cigarettes in life and currently smoked), never (smoked鈥�<鈥�100 cigarettes in life), and former (between now and never). Physical activity levels were classified as vigorous (vigorous work or recreational activities), moderate (moderate work or recreational activities), and no. Diabetes mellitus was defined as participants if they met one or more of the following criteria: (1) had been diagnosed with diabetes by a physician; (2) had an HbA1c level鈥夆墺鈥�6.5%; or (3) were on diabetes medication or insulin. Hypertension was defined as participants meeting any of the following criteria: (1) had been told by a doctor that they had hypertension or were required to take medication; (2) were currently taking antihypertensive medication; or (3) had a systolic blood pressure鈥�>鈥�140 mmHg or diastolic blood pressure鈥�>鈥�90 mmHg on more than three out of four blood pressure measurements. Depression was assessed using the Patient Health Questionnaire-9 (PHQ-9), with scores categorized as none (鈮も��4), mild (5鈥�9), moderate (10鈥�14), moderately-severe (15鈥�19), and severe (鈮モ��20) [39, 40].

Statistical analysis

Analyses were performed using R version 4.3.2 (2023-10-31, ). To enhance analytical rigor, we extracted and applied relevant dietary weights to all data. Processing of all weighted data followed the NHANES Analytic and Reporting Guidelines (). Continuous variables were presented as weighted means (standard error) (S.E) and compared between groups using weighted Student鈥檚 t-tests. Categorical variables were presented as numbers (n) and survey-weighted percentages, with group comparisons using weighted chi-square tests.

We used weighted multivariable logistic regression to explore the association between SSBs and constipation, developing four models: the crude model was not adjusted for any variables; model 1 was adjusted for age, gender, and race; model 2 was adjusted for age, gender, race, PIR, BMI, educational level, marital status, drinking status, smoking status, energy, sugar, moisture, fat, protein, physical activity levels, hypertension, diabetes, and depression; model 3 was further adjusted for HEI-2015 scores based on model 2, with age, PIR, BMI, and HEI-2015 scores treated as categorical variables. Weighted restricted cubic spline (RCS) analyses were conducted to examine potential non-linear relationships to further evaluate the non-linear relationships between SSBs intake and constipation risk. Furthermore, stratified analyses were performed to assess whether associations varied by age, gender, drinking status, and diet quality. A two-sided p-value鈥�<鈥�0.05 was considered statistically significant.

Results

Basic characteristics of participants

Among the 7,979 participants included in the final analysis, 618 (7.74%) were identified as having constipation. As summarized in Table听1, individuals with constipation were significantly younger (44.64鈥壜扁��0.92 vs. 46.99鈥壜扁��0.38, p鈥�=鈥�0.01), more likely to be aged 20鈥�39 years (42.80% vs. 36.16%, p鈥�=鈥�0.03), female (68.18% vs. 50.49%, p鈥�<鈥�0.0001), and Non-Hispanic Black (14.94% vs. 10.22%, p鈥�=鈥�0.02) compared to those without constipation. Moreover, participants with constipation exhibited lower educational levels, a lower PIR (2.78鈥壜扁��0.11 vs. 3.07鈥壜扁��0.06, p鈥�=鈥�0.01), and a lower BMI (27.42鈥壜扁��0.39 vs. 28.95鈥壜扁��0.12, p鈥�<鈥�0.001). Additionally, they reported less alcohol consumption (33.64% vs. 26.22%, p鈥�=鈥�0.01), poorer diet quality (HEI-2015 scores: 50.87鈥壜扁��0.79 vs. 53.75鈥壜扁��0.40, p鈥�<鈥�0.001), lower levels of physical activity, and a higher prevalence of depression (PHQ-9 scores: 4.24鈥壜扁��0.28 vs. 3.04鈥壜扁��0.10, p鈥�<鈥�0.001). Notably, both SSBs-kcal (211.96鈥壜扁��16.09 vs. 162.49鈥壜扁��8.62, p鈥�<鈥�0.001) and SSBs-grams (690.43鈥壜扁��46.37 vs. 586.48鈥壜扁��28.44, p鈥�=鈥�0.02) were significantly higher among participants with constipation.

Table 1 Basic characteristics of participants
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Association between SSBs and constipation

Weighted multivariable logistic regression analysis revealed a positive association between SSB consumption and constipation. In model 1, which was not adjusted for any variables, Table听2 indicated that both SSBs-grams (ORQ3 vs. Q1 = 1.485, 95% CI: 1.102鈥�2.002, p鈥�=鈥�0.011; ORQ4 vs. Q1 = 1.465, 95% CI: 1.144鈥�1.875, p鈥�=鈥�0.004; p for trend鈥�=鈥�0.001) and SSBs-kcal (ORQ3 vs. Q1 = 1.390, 95% CI: 1.039鈥�1.860, p鈥�=鈥�0.028; ORQ4 vs. Q1 = 1.684, 95% CI: 1.301鈥�2.181, p鈥�<鈥�0.001; p for trend鈥�<鈥�0.0001) were significantly associated with constipation. The association remained statistically significant in model 3 between SSBs-grams (ORQ3 vs. Q1 = 1.419, 95% CI: 1.064鈥�1.893, p鈥�=鈥�0.019; p for trend鈥�=鈥�0.02) and SSBs-kcal (ORQ4 vs. Q1 = 1.567, 95% CI: 1.100-2.234, p鈥�=鈥�0.015; p for trend鈥�=鈥�0.016) and the prevalence of constipation. Further analysis of specific beverage types, as shown in Supplementary Table 1, indicated that the SSBs-grams from soft drinks (ORQ2 vs. Q1 = 1.681, 95% CI: 1.109鈥�2.548, p鈥�=鈥�0.016) and smoothies and carbonated water (ORQ2 vs. Q1 = 1014.973, 95% CI: 2.106-489106.849, p鈥�=鈥�0.020) were strongly associated with constipation.

Table 2 Relationship between SSBs and constipation
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RCS analyses were conducted to further simulate the potential non-linear relationship between SSBs and constipation. As shown in Fig.听2, there was no evidence of a non-linear relationship between SSBs-grams and constipation (p overall: 0.008, p non-linear: 0.100), whereas SSBs-kcal revealed a significant non-linear trend (p overall: 0.010, p non-linear: 0.026). The trend analysis substantiated the regression results presented in Table听2, indicating that higher SSBs consumption is associated with an increased risk of constipation.

Fig. 2
figure 2

Association between SSBs-grams (a) as well as SSBs-kcal (b) and constipation. RCS analysis was conducted in model 3 which was adjusted for all covariates. The ORs of constipation were shown as solid black lines, and the corresponding 95% CIs were shown as short black dashed lines. Abbreviations: ORs, odds ratios; CIs, confidence intervals; SSBs, sugar-sweetened beverages

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Subgroup analysis

To investigate whether stratified variables modified the observed association between SSBs and constipation, we conducted weighted stratified and interaction analyses based on age, gender, drinking status, and HEI-2015 scores. As shown in Fig.听3, the SSBs-grams in participants aged 20鈥�39 years (ORQ3 vs. Q1 = 2.267, 95% CI: 1.386鈥�3.708, p鈥�=鈥�0.002; ORQ4 vs. Q1 = 2.171, 95% CI: 1.099鈥�4.288, p鈥�=鈥�0.027) and SSBs-kcal (ORQ3 vs. Q1 = 1.735, 95% CI: 1.018鈥�2.955, p鈥�=鈥�0.043; ORQ4 vs. Q1 = 2.119, 95% CI: 1.142鈥�3.933, p鈥�=鈥�0.01) exhibited significant positive associations with constipation. Among females, SSBs-kcal (ORQ4 vs. Q1 = 1.585, 95% CI: 1.006鈥�2.497, p鈥�=鈥�0.047) was positively associated with constipation. Similarly, participants who consumed alcohol exhibited a positive association between constipation and both SSBs-grams (ORQ3vs. Q1 = 1.725, 95% CI: 1.156鈥�2.573, p鈥�=鈥�0.009) and SSBs-kcal (ORQ4 vs. Q1 = 1.727, 95% CI: 1.074鈥�2.777, p鈥�=鈥�0.026). When stratified by diet quality, Fig.听3 revealed that participants with high diet quality (HEI-2015 scores鈥夆墺鈥�50) exhibited a significant association between SSBs-grams (ORQ4 vs. Q1 = 1.705, 95% CI: 1.009鈥�2.881, p鈥�=鈥�0.047) and constipation prevalence. However, the observed differences were not statistically significant (all p for interaction鈥�>鈥�0.05).

Fig. 3
figure 3

The weighted stratified and interaction analyses of the relationship between SSBs and constipation. The weighted stratified and interaction analyses of the relationship between SSBs-grams (shown in the left half of the figure), as well as SSBs-kcal (shown in the right half of the figure) and constipation, were conducted in model 3 by removing the applied categorical variables at the time of their respective strata. Abbreviations: ORs, odds ratios; CIs, confidence intervals; SSBs, sugar-sweetened beverages; HEI-2015, Healthy Eating Index-2015

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Sensitivity analysis

To assess the robustness of our findings, we subsequently conducted a sensitivity analysis. Extreme SSBs intakes were defined as those within the top 1% of the SSBs intake distribution. We then performed the weighted multivariable logistic regression analysis on the data after excluding the extreme values. Table听3 revealed a positive association between SSBs-grams (ORQ3 vs. Q1 = 1.415, 95% CI: 1.057鈥�1.895, p鈥�=鈥�0.021; p for trend鈥�=鈥�0.032) as well as SSBs-kcal (ORQ4 vs. Q1 = 1.457, 95% CI: 1.003鈥�2.115, p鈥�=鈥�0.048; p for trend鈥�=鈥�0.036) and constipation. These findings demonstrated a high degree of concordance with the regression results in Table听2, indicating that the results were not influenced by these extreme values and were highly reliable and robust.

Table 3 The sensitivity analysis by excluding participants with extreme SSBs intake
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Discussion

This study provided critical insights into the association between SSBs and constipation. Our findings indicated that higher SSBs intake-whether measured in grams or kilocalories-was significantly associated with an increased prevalence of constipation.

Participants in the higher quartiles of SSBs consumption had elevated odds of constipation even after adjusting for all covariates. Additionally, weighted RCS analyses further indicated that there was a non-linear relationship between SSBs-kcal and constipation. Weighted stratified analyses revealed that the association was particularly pronounced among younger adults (aged 20鈥�39 years), females, and individuals who consumed alcohol and with higher HEI-2015 scores.

Constipation represents a prevalent gastrointestinal symptom and a widespread health problem in our country [41], with higher incidence rates among the elderly and females [42]. The prevalence of constipation varies widely, ranging from 0.7 to 79% in North America, highlighting its substantial global impact [8, 9]. After applying the nadir criteria, 618 of 7,979 participants (7.74%) were identified as having constipation. Constipation is linked to a variety of complications [43], underscoring the critical need for effective prevention and treatment. SSBs, defined as beverages sweetened with added sugar or other sweeteners [44], are typically high in sugar and kilocalories but lack nutritional value. Evidence suggests [16] that the consumption of SSBs is increasing among children (from 87听kcal/day to 154听kcal/day) and adults. SSBs contribute to a significant global, regional, and national disease burden, with variations by age and gender groups [20]. A cross-sectional study [31] involving 121,490 participants identified an increased inflammatory bowel disease risk with SSB consumption, particularly Crohn鈥檚 disease. While the association between SSBs and the gastrointestinal tract has been investigated, the association with constipation remains less well-defined. In this study, as shown in Table听1, participants with constipation had significantly higher mean SSBs-kcal (211.96鈥壜扁��16.09 vs. 162.49鈥壜扁��8.62, p鈥�<鈥�0.001) and SSBs-grams (690.43鈥壜扁��46.37 vs. 586.48鈥壜扁��28.44, p鈥�=鈥�0.02) than those without constipation. Similar conclusions could be drawn from the weighted multivariable logistic regression analysis presented in Table听2, SSBs-grams (ORQ3 vs. Q1 = 1.419, 95% CI: 1.064鈥�1.893, p鈥�=鈥�0.019; p for trend鈥�=鈥�0.02) and SSBs-kcal (ORQ4 vs. Q1 = 1.567, 95% CI: 1.100-2.234, p鈥�=鈥�0.015; p for trend鈥�=鈥�0.016) exhibited a significant positive association with constipation after adjusting for all variables. Supplementary Table 1 indicated a notable link between soft drinks (ORQ2 vs. Q1 = 1.681, 95% CI: 1.109鈥�2.548, p鈥�=鈥�0.016) and constipation. As the most widely consumed beverage [45], excessive soft drink consumption can lead to various health complications, including obesity [46], diabetes [47], dental disease, and intestinal health problems. Research has shown a positive association between increased consumption of soft drinks and constipation in Indonesian adolescents [48]. Moreover, the ingestion of coffee and tea may exert a detrimental effect on the digestive system, potentially increasing constipation risk [49].

Constipation prevalence varies by age and gender. As shown in Table听1, constipation was more prevalent among younger women. However, epidemiological evidence suggests that constipation is significantly more common in older adults [42], possibly due to comorbidities. Additionally, alcohol consumption was identified as a risk factor for constipation, with diet quality differences affecting gut health and modulating SSBs鈥� impact. To further identify high-risk populations, we conducted a weighted stratified analysis using age, gender, alcohol consumption, and diet quality as stratification factors. The results presented in Fig.听3 demonstrated that the risk of constipation may rise with increased SSBs-grams and SSBs-kcal in participants aged 20鈥�39 years. This conclusion could also be drawn from Table听1, which indicated a higher prevalence of constipation in this age group (42.80% vs. 36.16%, p鈥�=鈥�0.03). Consistent with a 2010 study [16], the consumption of SSBs typically declined with age, implying that the requirements of SSBs may fluctuate across different life stages. Moreover, constipation prevalence differed between female and male participants (68.18% vs. 50.49%, p鈥�<鈥�0.0001), likely attributed to the inherent physiological and lifestyle differences [50]. Stratified by drinking status, the study found that there was a closer link between intake of SSBs and constipation among alcohol consumers. This is likely because alcohol consumption itself is a risk factor for constipation, inhibiting peristalsis and decelerating intestinal transit. Alcohol also exerted a modulating effect on the intestinal microbiota [51], potentially increasing intestinal issues like constipation, aligning with our findings. Previous studies had demonstrated a positive association between SSBs and constipation in the group with higher HEI-2015 scores. However, one study reported a negative association [37], with high-diet-quality participants (high HEI-2015 scores) having lower constipation prevalence than those with low diet quality. The present study鈥檚 inconsistent results with prior research may be a consequence of a complex interplay of factors, potentially including the participants鈥� simultaneous pursuit of a high dietary quality and high SSBs intake. It is plausible that the SSBs components may affect the absorption and utilization of nutrients or alter the intestinal microbiota, ultimately triggering constipation. Alternatively, some covariates, such as insufficient physical activity, depression, or other physical illnesses may further exacerbate the risk of constipation. Consequently, further research is required to verify the reliability of the subgroup analysis results and the relationship between these factors and constipation.

Our findings suggest a significant association between the consumption of SSBs and constipation. The underlying mechanisms may be related to the following aspects. A study published in 2019 demonstrated that dysfunction in intestinal motility was a contributing factor to constipation [7]. SSBs can affect intestinal motility time [52] by altering intestinal physiology, resulting in a deceleration of intestinal peristalsis. This may be due to the sugars in SSBs impacting the enteric nervous system, potentially through changes in neurotransmitter release and receptor binding, consequently influencing intestinal function. Abnormal gut microbiota [53, 54] can also cause constipation. Several studies have shown that the high sugar in SSBs negatively affects the gut microbiota [52, 55], increasing harmful bacteria, inhibiting beneficial bacteria, and altering the intestinal flora composition in mice. Such imbalances disrupt peristalsis and gut barrier function, allowing the infiltration of harmful substances into the intestines and raising the risk of constipation. Additionally, physiological changes from elevated SSBs intake [56], such as blood glucose fluctuations, may impair intestinal function and have detrimental effects on the intestinal tract. These fluctuations can cause insulin resistance and other physiological responses, thereby increasing the risk of constipation. Notably, some covariates included in this study have also been shown to be associated with constipation. High intake of SSBs is associated with an increased risk of depression [40], malnutrition [57], diabetes [19, 58], and obesity, which are also interconnected with constipation. Nevertheless, the precise mechanisms remain unclear and require further investigation to ascertain the potential mechanisms and causal relationship. In summary, reducing SSBs intake to lower the risk of constipation is crucial for public health. Previous epidemiology emphasizes the global public health impact of increased SSBs intake. Reducing SSBs not only cuts the risk of constipation and other bowel diseases but also significantly benefits adolescent and child health, mental health, and global health, easing the burden on the healthcare system. It could also prompt the food industry to change the type of beverages marketed, produce healthier and tastier beverages, and boost productivity. In the future, it will be necessary to develop policies like existing tax policies and advertising restrictions, and a comprehensive implementation strategy for multi-structural societal cooperation in health education and promotion to maximize public health benefits.

This study had several key advantages. First of all, the use of a large, nationally representative sample included 7,979 participants from the 2007鈥�2010 NHANES database, and the application of a rigorous multi-stage probability sampling method effectively represented the U.S. population and ensured broad representativeness. Notably, this study was the first investigation into the association between SSBs and constipation. In addition to delineating the general characteristics of constipation, we also adjusted for a comprehensive set of potential confounders, enhancing the accuracy and reliability of the findings. However, some limitations should be acknowledged. The cross-sectional design limited our ability to establish causality between SSBs and constipation, necessitating the execution of cohort studies or randomized controlled trials. SSBs consumption data from two 24-hour dietary recalls may inevitably introduce reporting or recall bias, potentially affecting the data accuracy and reliability. Future studies could use more objective and accurate dietary assessment methods, such as real-time dietary tracking via smart devices or dietary biomarkers. We quantified SSBs intake in grams and kilocalories but did not account for individual bioavailability variability. Finally, the inevitable challenge of over-stratification and reduced statistical power emerged in the subgroup analyses. Subsequent analyses should include measures to mitigate the effects of these problems, such as limiting the number of strata, increasing the sample size, or conducting sensitivity analyses. Finally, despite our comprehensive efforts to incorporate a wide range of potential confounders, it is recognized that the other relevant confounders may have been missed. In conclusion, our findings offer novel insights into the SSBs-constipation relationship, underscoring its influence on public health. Future longitudinal studies are needed to confirm these associations and elucidate the underlying mechanisms linking SSBs to gastrointestinal dysfunction.

Conclusions

The study demonstrated a robust positive association between SSBs consumption and the prevalence of constipation, with RCS and stratified analyses showing the non-linear relationship and variations across populations. Given the detrimental health effects of SSBs, it is crucial to formulate and implement policies aimed at reducing their consumption, alongside promoting the identification and adoption of healthier alternatives.

Data availability

Data are publicly available online ().

Abbreviations

SSBs:

Sugar-sweetened beverages

NHANES:

National Health and Nutrition Examination Survey

BSFS:

Bristol Stool Form Scale

RCS:

Restricted cubic spline

IBD:

Inflammatory bowel disease

NCHS:

National Center for Health Statistics

USDA:

United States Department of Agriculture

MEC:

Mobile Examination Center

BMI:

Body mass index

PIR:

Poverty-income ratio

HEI-2015:

Healthy Eating Index-2015 scores

PHQ-9:

Patient Health Questionnaire-9

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Acknowledgements

We extend our sincere gratitude to all participants of the NHANES database, whose contributions have facilitated further scientific analysis through the provision of invaluable data.

Funding

The study was supported by the Lanzhou Science and Technology Program (2023-1-19), The Natural Science Foundation of Gansu Province (23JRRA0939), the Gansu Province Higher Education Project for Teaching Achievement Cultivation (202314-16), and Medical Innovation and Development Project of Lanzhou University (lzuyxcx-2022-41). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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Authors and Affiliations

  1. The First Clinical Medical College, Lanzhou University, Lanzhou, Gansu, China

    Xiaotong Zhang

  2. Department of Gastroenterology, The First Hospital of Lanzhou University, Lanzhou, Gansu, China

    Xiaotong Zhang,听Min Liu,听Yuping Wang,听Ya Zheng听&听Yongning Zhou

  3. Gansu Province Clinical Research Center for Digestive Diseases, The First Hospital of Lanzhou University, Lanzhou, Gansu, China

    Xiaotong Zhang,听Min Liu,听Yuping Wang,听Ya Zheng听&听Yongning Zhou

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Contributions

X.Z., M.L., Y.Z., Y.W., and Y.Z. were responsible for the work described in this article. X.Z., Y.Z., and Y.W. were responsible for the literature search and determination of the research direction. X.Z., M.L., and Z.Y. were responsible for downloading the data and conducting the requisite analysis. X.Z., Y.W., and Y.Z. were responsible for interpreting the data. X.Z. and Z.Y. were responsible for drafting the manuscript. Y.Z., M.L., Y.W., and Y.Z. were responsible for checking and revising the key points of the manuscript. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Ya Zheng or Yongning Zhou.

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Ethics approval and consent to participate

This study did not entail any risk to human subjects, which was performed following the Declaration of Helsinki and approved by the NCHS Research Ethics Review Board (; accessed on August 24, 2022). NHANES was approved by the National Centre for Health Statistics research ethics review board. All participants in NHANES have provided informed consent.

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Zhang, X., Liu, M., Wang, Y. et al. The impact of sugar-sweetened beverages consumption on constipation: evidence from NHANES. 樱花视频 25, 1126 (2025). https://doi.org/10.1186/s12889-025-22265-7

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  • DOI: https://doi.org/10.1186/s12889-025-22265-7

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樱花视频

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