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.
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.
Authors: O H Ryu; J Lee; K W Lee; H Y Kim; J A Seo; S G Kim; N H Kim; S H Baik; D S Choi; K M Choi Journal: Diabetes Res Clin Pract Date: 2005-09-19 Impact factor: 5.602
Authors: Andrew O Odegaard; Mark A Pereira; Woon-Puay Koh; Kazuko Arakawa; Hin-Peng Lee; Mimi C Yu Journal: Am J Clin Nutr Date: 2008-10 Impact factor: 7.045
Authors: S van Dieren; C S P M Uiterwaal; Y T van der Schouw; D L van der A; J M A Boer; A Spijkerman; D E Grobbee; J W J Beulens Journal: Diabetologia Date: 2009-09-01 Impact factor: 10.122
Authors: Shilpa N Bhupathiraju; An Pan; Vasanti S Malik; JoAnn E Manson; Walter C Willett; Rob M van Dam; Frank B Hu Journal: Am J Clin Nutr Date: 2012-11-14 Impact factor: 7.045
Authors: Geertruida J van Woudenbergh; Anneleen Kuijsten; Dagmar Drogan; Daphne L van der A; Dora Romaguera; Eva Ardanaz; Pilar Amiano; Aurelio Barricarte; Joline W J Beulens; Heiner Boeing; H Bas Bueno-de-Mesquita; Christina C Dahm; M-Doleres Chirlaque; Francoise Clavel; Francesca L Crowe; Piia-Piret Eomois; Guy Fagherazzi; Paul W Franks; Jytte Halkjaer; Kay T Khaw; Giovanna Masala; Amalia Mattiello; Peter Nilsson; Kim Overvad; J Ramón Quirós; Olov Rolandsson; Isabelle Romieu; Carlotta Sacerdote; María-José Sánchez; Matthias B Schulze; Nadia Slimani; Ivonne Sluijs; Annemieke M W Spijkerman; Giovanna Tagliabue; Anne Tjønneland; Rosario Tumino; Nita G Forouhi; Stephen Sharp; Claudia Langenberg; Edith J M Feskens; Elio Riboli; Nicholas J Wareham Journal: PLoS One Date: 2012-05-30 Impact factor: 3.240