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Folic acid intake and folate status and colorectal cancer risk
- Source :
- Clinical Nutrition. 37(6):1926-1934
- Publication Year :
- 2018
-
Abstract
- Background & aims: To evaluate the controversies among the studies assessing the association between folic acid intake or folate status and colorectal cancer risk. Methods: PubMed, Cochrane library and references of related articles were searched from January 2000 to September 2016. Studies on folic acid intake or folate status and colorectal cancer or adenoma risk were included. Full text review was conducted for potentially eligible studies. Quality assessment was performed. Random-effects meta-analysis was used to estimate risk ratio and 95% Confidence Intervals. Analysis was conducted by Comprehensive Meta-Analysis software. Results: Folic acid supplement intake showed no significant effect on colorectal cancer risk in meta analysis of randomized controlled trials, RR: 1.07 (95% CI: 0.86-1.43). The effect on risk was not significant in cohort studies either; RR = 0.96 (95% CI: 0.76-1.21). However, there was significant reduced colorectal cancer risk in total folate intake in cohort studies; 0.71 (95% CI: 0.59-0.86). Odds Ratio was also significantly reduced in case control studies; 0.77 (95% CI: 0.62-0.95). Nevertheless once folate status was measured as Red Blood Cell folate content, no significant effect on colorectal cancer risk was observed; 1.05 (95% CI: 0.85-1.30). Conclusion: The differences in bioavailability and metabolism of synthetic folic acid and natural dietary folate as well as variation in the baseline characteristics of subjects and various methods of folate status assessment might be the main reasons for these controversies. Findings of present study highlight the importance of individualized folic acid supplement intake given the fact that the beneficiary effects of long term folic acid supplementation is not confirmed. (C) 2017 Elsevier Ltd and European Society for Clinical Nutrition and Metabolism. All rights reserved.
- Subjects :
- Oncology
SERUM FOLATE
medicine.medical_specialty
Folic acid
Colorectal cancer
RED-CELL
Biological Availability
Nutritional Status
HOMOCYSTEINE
Cochrane Library
METABOLISM
Critical Care and Intensive Care Medicine
03 medical and health sciences
0302 clinical medicine
Risk Factors
Internal medicine
DIETARY-INTAKE
COLON
ADENOMAS
medicine
Odds Ratio
Humans
030212 general & internal medicine
Randomized Controlled Trials as Topic
FORTIFICATION
Nutrition and Dietetics
PLASMA FOLATE
business.industry
Case-control study
Odds ratio
medicine.disease
Folate status
Diet
B vitamins
Meta-analysis
030220 oncology & carcinogenesis
Relative risk
Case-Control Studies
Dietary Supplements
Systematic review
B-VITAMINS
business
Colorectal Neoplasms
Cohort study
Subjects
Details
- Language :
- English
- ISSN :
- 02615614
- Volume :
- 37
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- Clinical Nutrition
- Accession number :
- edsair.doi.dedup.....2f87a1203cc074021617b9cca2710309