The goal of this study was to determine long-term mortality and causes of death in patients after hospitalization for inflammatory bowel disease (IBD).
A cohort of patients admitted to the hospital ...because of IBD for the first time between 1998 and 2010 was identified by linkage of nationwide Dutch registries. Mortality risks and causes of death in Crohn's disease (CD) and ulcerative colitis (UC) patients were compared with a large random sample of individuals from the general population. Multivariable Cox regression models were used to calculate hazard ratios (HRs) with 95% confidence intervals (CIs).
In total, 23,003 patients (56.1% women; mean age, 44.8 years) were hospitalized for IBD. Patients admitted for IBD had a higher risk of death than those from the general population. Adjusted HRs for 5-year all-cause mortality were 2.42 (95% CI, 1.15-5.12) and 1.45 (95% CI, 1.26-1.66) in men and women hospitalized for CD, respectively. Corresponding HRs for UC were 1.59 (95% CI, 1.39-1.83) and 1.13 (95% CI, 0.98-1.31). Mortality among patients after hospitalization for IBD decreased between 1998-2004 and 2005-2010. Patients admitted for UC had a higher risk of all-cause mortality than those admitted for CD. Inflammatory bowel disease patients died more often from (colorectal) cancer and gastrointestinal disease and less often from cardiovascular disease relative to the general population.
Mortality of patients after hospitalization for IBD has decreased over time. Causes of death in CD and UC patients differ from those in the general population.
Individuals with inflammatory bowel disease (IBD) often hold strong beliefs on how diet impacts their disease. This study aimed to compare dietary intakes between IBD patients and individuals from ...the general population and to assess associations of dietary factors with relapse in patients with IBD.
Patients with longstanding Crohn's disease and ulcerative colitis (n = 165) filled out food frequency questionnaires, as did individuals participating in a Dutch population-based study (controls) (n = 1469). Multivariable regression analyses were used to assess differences in habitual dietary intake between IBD patients and controls, and to estimate associations of dietary factors in patients in remission with the development of disease relapse at follow-up.
IBD patients had higher intakes of animal protein (3.50 g/d, 95% confidence interval (CI) 1.67–5.34) and carbohydrate (10.1 g/d, 95% CI 5.23–14.9) than controls and lower intakes of (unsaturated) fat (−3.53 g/d, 95% CI −5.57– −1.50), dietary fiber (−2.19 g/d, 95% CI −3.05– −1.32) and alcohol (−0.84 g/d, 95% CI −1.46– −0.22). This was explained by a higher consumption of carbonated beverages, meat and poultry and lower consumption of fruit, vegetables and dairy products (except cheese) by IBD patients compared with controls. Several dietary factors, particularly (saturated) fat and fiber, appeared to be associated with risk of relapse.
IBD patients had higher dietary intakes of (animal) protein and carbohydrate and lower intakes of (unsaturated) fat, dietary fiber and alcohol compared with a general Dutch population. The results further underscore that dietary factors may have a role in disease course.
Smoking has a negative impact on Crohn's disease (CD), but the mechanisms underlying this association are unclear. We compared the gut microbiota composition of smoking with nonsmoking patients with ...CD using a metagenomic approach.
Stool samples and clinical data were collected from current smokers and nonsmokers with CD from France and the Netherlands, matched for country, gender, age, disease activity, and body mass index. Fecal DNA was sequenced on an Illumina HiSeq 2500. On average, 40 million paired-end reads were generated per sample. Gene richness and the Shannon index were computed to assess microbial diversity. Wilcoxon's signed-rank tests for paired samples were performed to detect differences between the 2 groups.
In total, 21 smoking and 21 nonsmoking patients with CD were included. Compared with nonsmoking patients, gut microbial gene richness (P = 0.01), genus diversity (P < 0.01), and species diversity (P = 0.01) were decreased in smoking patients. This was accompanied by a reduced relative abundance of the genera Collinsella (P = 0.02), Enterorhabdus (P = 0.02), and Gordonibacter (P = 0.02) in smokers. No statistically significant differences at the species level were observed, although smokers had lower proportions of Faecalibacterium prausnitzii (P = 0.10).
Gut microbial diversity is reduced in smokers with CD compared with nonsmokers with CD. The microbial profile differs between these groups at the genus level. Future studies should evaluate whether intestinal microbes mediate the adverse effects of smoking in CD.
Dairy products may be involved in the etiology of inflammatory bowel disease by modulating gut microbiota and immune responses, but data from epidemiological studies examining this relationship are ...limited. We investigated the association between prediagnostic intake of these foods and dietary calcium, and the subsequent development of Crohn's disease (CD) and ulcerative colitis (UC).
In total, 401,326 participants were enrolled in the European Prospective Investigation into Cancer and Nutrition cohort. At recruitment, consumption of total and specific dairy products (milk, yogurt, and cheese) and dietary calcium was measured using validated food frequency questionnaires. Cases developing incident CD (n = 110) or UC (n = 244) during follow-up were matched with 4 controls. Conditional logistic regression analyses were used to calculate odds ratios (ORs) with 95% confidence intervals (CIs), adjusted for total energy intake and smoking.
Compared with the lowest quartile, the ORs for the highest quartile of total dairy products and dietary calcium intake were 0.61 (95% CI, 0.32-1.19, p trend = 0.19) and 0.63 (95% CI, 0.28-1.42, p trend = 0.23) for CD, and 0.80 (95% CI, 0.50-1.30, p trend = 0.40) and 0.81 (95% CI, 0.49-1.34, p trend = 0.60) for UC, respectively. Compared with nonconsumers, individuals consuming milk had significantly reduced odds of CD (OR 0.30, 95% CI, 0.13-0.65) and nonsignificantly reduced odds of UC (OR 0.85, 95% CI, 0.49-1.47).
Milk consumption may be associated with a decreased risk of developing CD, although a clear dose-response relationship was not established. Further studies are warranted to confirm this possible protective effect.
Oxidative stress may be involved in the aetiology of inflammatory bowel disease and whether dietary polyphenols, which possess antioxidants properties, prevent its development is unknown.
A total of ...401,326 men and women aged 20 to 80 years from 8 countries were recruited between 1991 and 1998 and at baseline completed validated food frequency questionnaires. Dietary polyphenol intake was measured using Phenol-Explorer, a database with information on the content of 502 polyphenols. Incident cases of Crohn's diseases (CD) and ulcerative colitis (UC) were identified during the follow-up period of up to December 2010. A nested case-control study using conditional logistic regression estimated the odds ratios (ORs), and 95% confidence intervals, for polyphenol intake (categories based on quartiles) and developing CD or UC.
In total, 110 CD (73% women) and 244 UC (57% women) cases were identified and matched to 440 and 976 controls, respectively. Total polyphenol intake was not associated with CD (P trend = 0.17) or UC (P trend = 0.16). For flavones and CD, there were reduced odds for all quartiles, which were statistically significant for the third (OR3rd versus 1st quartile = 0.33; 95% confidence interval, 0.15-0.69) and there was an inverse trend across quartiles (P = 0.03). Similarly, for resveratrol, there was an inverse association with CD (OR4th versus 1st quartile = 0.40; 95% confidence interval, 0.20-0.82) with an inverse trend across quartiles (P = 0.02). No significant associations between subtypes of polyphenols and UC were found. Effect modification by smoking in CD was documented with borderline statistical significance.
The data supports a potential role of flavones and resveratrol in the risk of developing CD; future aetiological studies should investigate these dietary components and further examine the potential for residual confounding.
Abstract
Background
A low vitamin D status has been put forward as a potential risk factor for the development of inflammatory bowel disease (IBD). This study investigated the association between ...prediagnostic circulating vitamin D concentrations and dietary intakes of vitamin D, and the risk of Crohn's disease (CD) and ulcerative colitis (UC).
Methods
Among 359,728 participants of the European Prospective Investigation into Cancer and Nutrition cohort, individuals who developed CD or UC after enrollment were identified. Each case was matched with2 controls by center, gender, age, date of recruitment, and follow-up time. At cohort entry, blood samples were collected and dietary vitamin D intakes were obtained from validated food frequency questionnaires. Serum 25-hydroxyvitamin D levels were measured using liquid chromatography-tandem mass spectrometry. Conditional logistic regression was performed to determine the odds of CD and UC.
Results
Seventy-two participants developed CD and 169 participants developed UC after a median follow-up of 4.7 and 4.1 years, respectively. Compared with the lowest quartile, no associations with the 3 higher quartiles of vitamin D concentrations were observed for CD (p trend = 0.34) or UC (p trend = 0.66). Similarly, no associations were detected when serum vitamin D levels were analyzed as a continuous variable. Dietary vitamin D intakes were not associated with CD (p trend = 0.39) or UC (p trend = 0.83).
Conclusions
Vitamin D status was not associated with the development of CD or UC. This does not suggest a major role for vitamin D deficiency in the etiology of IBD, although larger studies are needed to confirm these findings.
Background
Industrialization has been linked to the etiology of inflammatory bowel disease (IBD).
Aim
We investigated the association between air pollution exposure and IBD.
Methods
The European ...Prospective Investigation into Cancer and Nutrition cohort was used to identify cases with Crohn’s disease (CD) (
n
= 38) and ulcerative colitis (UC) (
n
= 104) and controls (
n
= 568) from Denmark, France, the Netherlands, and the UK, matched for center, gender, age, and date of recruitment. Air pollution data were obtained from the European Study of Cohorts for Air Pollution Effects. Residential exposure was assessed with land-use regression models for particulate matter with diameters of <10 μm (PM
10
), <2.5 μm (PM
2.5
), and between 2.5 and 10 μm (PM
coarse
), soot (PM
2.5 absorbance
), nitrogen oxides, and two traffic indicators. Conditional logistic regression analyses were performed to calculate odds ratios (ORs) with 95 % confidence intervals (CIs).
Results
Although air pollution was not significantly associated with CD or UC separately, the associations were mostly similar. Individuals with IBD were less likely to have higher exposure levels of PM
2.5
and PM
10
, with ORs of 0.24 (95 % CI 0.07–0.81) per 5 μg/m
3
and 0.25 (95 % CI 0.08–0.78) per 10 μg/m
3
, respectively. There was an inverse but nonsignificant association for PM
coarse
. A higher nearby traffic load was positively associated with IBD OR 1.60 (95 % CI 1.04–2.46) per 4,000,000 motor vehicles × m per day. Other air pollutants were positively but not significantly associated with IBD.
Conclusion
Exposure to air pollution was not found to be consistently associated with IBD.
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