Tea consumption and risk of type 2 diabetes: a meta-analysis of cohort studies

doi:10.1007/s11606-009-0929-5

Meta-Analysis

. 2009 May;24(5):557-62.

doi: 10.1007/s11606-009-0929-5. Epub 2009 Mar 24.

Tea consumption and risk of type 2 diabetes: a meta-analysis of cohort studies

Yali Jing¹, Guanjun Han, Yun Hu, Yan Bi, Lirong Li, Dalong Zhu

Affiliations

PMID: 19308337
PMCID: PMC2669862
DOI: 10.1007/s11606-009-0929-5

Meta-Analysis

Tea consumption and risk of type 2 diabetes: a meta-analysis of cohort studies

Yali Jing et al. J Gen Intern Med. 2009 May.

. 2009 May;24(5):557-62.

doi: 10.1007/s11606-009-0929-5. Epub 2009 Mar 24.

Authors

Yali Jing¹, Guanjun Han, Yun Hu, Yan Bi, Lirong Li, Dalong Zhu

Affiliation

¹ Department of Endocrinology, Drum Tower Clinical Medical College of Nanjing Medical University, Nanjing, Jiangsu Province, China.

PMID: 19308337
PMCID: PMC2669862
DOI: 10.1007/s11606-009-0929-5

Abstract

Background: Tea consumption has been extensively studied in relation to various diseases, several epidemiologic studies have been performed to investigate the association of tea consumption with type 2 diabetes; however, the results of these studies were not entirely consistent.

Objective: To conduct a meta-analysis of studies that assessed the association of tea consumption and the risk of type 2 diabetes.

Research design and methods: We performed a systematic literature search through November 2008 in PUBMED, MEDLINE, EMBASE, and Cochrane Database of Systematic Reviews. The search was limited to English-language studies. Studies were excluded if they were type 1 diabetes, animal studies. Nine cohort studies were identified by two authors, and summary relative risks (RRs) were calculated using a random-effects model.

Results: We identified nine cohort studies, including 324,141 participants and 11,400 incident cases of type 2 diabetes with follow-up ranging from 5 to 18 years. The summary adjusted RR did not show that tea consumption was associated with a reduced type 2 diabetes risk (RR, 0.96; 95% confidence interval (CI), 0.92-1.01). Evidence from the results of our stratified analyses revealed that tea consumption > or =4 cups per day (RR, 0.8; 95% CI, 0.7-0.93) might play a role in the prevention of type 2 diabetes. However, no statistically significant association was observed for sex and the follow-up durations stratified between tea consumption and type 2 diabetes.

Conclusions: This meta-analysis indicates that tea consumption > or =4 cups per day may lower the risk of type 2 diabetes.

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Figures

**Figure 2**
Begg’s funnel plot of tea consumption and type 2 diabetes risks.

**Figure 3**
Stratified analysis pooled relative risks of type 2 diabetes on daily tea consumption. All the three levels were compared to those who never drinking tea. The area of the squares reflects the study-specific weight (i.e., inverse of the variance). The diamond represents the pooled relative risk and 95% confidence interval of every subgroup.

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References

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King H, Aubert RE, Herman WH. Global burden of diabetes, 1995–2025: prevalence, numerical estimates, and projections. Diabetes Care. 1998; 21: 1414–31. - PubMed

[2] {'text': '', 'ref_index': 1, 'ids': [{'type': 'DOI', 'value': '10.2337/diacare.21.9.1414', 'is_inner': False, 'url': 'https://doi.org/10.2337/diacare.21.9.1414'}, {'type': 'PubMed', 'value': '9727886', 'is_inner': True, 'url': 'https://pubmed.ncbi.nlm.nih.gov/9727886/'}]}

[3] King H, Aubert RE, Herman WH. Global burden of diabetes, 1995–2025: prevalence, numerical estimates, and projections. Diabetes Care. 1998; 21: 1414–31. - PubMed

[4] {'text': '', 'ref_index': 1, 'ids': [{'type': 'PMC', 'value': 'PMC7129589', 'is_inner': False, 'url': 'https://pmc.ncbi.nlm.nih.gov/articles/PMC7129589/'}, {'type': 'PubMed', 'value': '14502096', 'is_inner': True, 'url': 'https://pubmed.ncbi.nlm.nih.gov/14502096/'}]}

Zimmet P. The burden of type 2 diabetes: are we doing enough. Diabetes Metab. 2003; 29: 6S9–18. - PMC - PubMed

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[6] Zimmet P. The burden of type 2 diabetes: are we doing enough. Diabetes Metab. 2003; 29: 6S9–18. - PMC - PubMed

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Wild S, Roglic G, Green A, Sicree R, King H. Global prevalence of diabetes: estimates for the year 2000 and projections for 2030. Diabetes Care. 2004; 27: 1047–53. - PubMed

[8] {'text': '', 'ref_index': 1, 'ids': [{'type': 'DOI', 'value': '10.2337/diacare.27.5.1047', 'is_inner': False, 'url': 'https://doi.org/10.2337/diacare.27.5.1047'}, {'type': 'PubMed', 'value': '15111519', 'is_inner': True, 'url': 'https://pubmed.ncbi.nlm.nih.gov/15111519/'}]}

[9] Wild S, Roglic G, Green A, Sicree R, King H. Global prevalence of diabetes: estimates for the year 2000 and projections for 2030. Diabetes Care. 2004; 27: 1047–53. - PubMed

[10] {'text': '', 'ref_index': 1, 'ids': [{'type': 'DOI', 'value': '10.1056/NEJMoa010492', 'is_inner': False, 'url': 'https://doi.org/10.1056/nejmoa010492'}, {'type': 'PubMed', 'value': '11556298', 'is_inner': True, 'url': 'https://pubmed.ncbi.nlm.nih.gov/11556298/'}]}

Hu FB, Manson JE, Stampfer MJ. Diet, lifestyle, and the risk of type 2 diabetes mellitus in women. N Engl J Med. 2001; 345: 790–7. - PubMed

[11] {'text': '', 'ref_index': 1, 'ids': [{'type': 'DOI', 'value': '10.1056/NEJMoa010492', 'is_inner': False, 'url': 'https://doi.org/10.1056/nejmoa010492'}, {'type': 'PubMed', 'value': '11556298', 'is_inner': True, 'url': 'https://pubmed.ncbi.nlm.nih.gov/11556298/'}]}

[12] Hu FB, Manson JE, Stampfer MJ. Diet, lifestyle, and the risk of type 2 diabetes mellitus in women. N Engl J Med. 2001; 345: 790–7. - PubMed

[13] {'text': '', 'ref_index': 1, 'ids': [{'type': 'DOI', 'value': '10.1007/s12013-007-0026-5', 'is_inner': False, 'url': 'https://doi.org/10.1007/s12013-007-0026-5'}, {'type': 'PubMed', 'value': '17709883', 'is_inner': True, 'url': 'https://pubmed.ncbi.nlm.nih.gov/17709883/'}]}

Robertson R, Zhou H, Zhang T, Harmon JS. Chronic oxidative stress as a mechanism for glucose toxicity of the beta cell in type 2 diabetes. Cell Biochem Biophys. 2007; 48: 139–46. - PubMed

[14] {'text': '', 'ref_index': 1, 'ids': [{'type': 'DOI', 'value': '10.1007/s12013-007-0026-5', 'is_inner': False, 'url': 'https://doi.org/10.1007/s12013-007-0026-5'}, {'type': 'PubMed', 'value': '17709883', 'is_inner': True, 'url': 'https://pubmed.ncbi.nlm.nih.gov/17709883/'}]}

[15] Robertson R, Zhou H, Zhang T, Harmon JS. Chronic oxidative stress as a mechanism for glucose toxicity of the beta cell in type 2 diabetes. Cell Biochem Biophys. 2007; 48: 139–46. - PubMed

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Tea consumption and risk of type 2 diabetes: a meta-analysis of cohort studies

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Tea consumption and risk of type 2 diabetes: a meta-analysis of cohort studies

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