Black tea – helpful or harmful? A review of the evidence
| Autor: | E J Gardner, Anthony R. Leeds, C. H. S. Ruxton |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
medicine.medical_specialty
Medicine (miscellaneous) Coronary Disease Antioxidants Beverages chemistry.chemical_compound Cognition Phenols Bone Density Risk Factors Neoplasms Environmental health Epidemiology medicine Humans Tea consumption Black tea Flavonoids Evidence-Based Medicine Nutrition and Dietetics Tea business.industry Confounding Polyphenols food and beverages Coronary heart disease Surgery Affect chemistry Caffeine consumption Meta-analysis Caffeine business |
| Zdroj: | European Journal of Clinical Nutrition. 61:3-18 |
| ISSN: | 1476-5640 0954-3007 |
| DOI: | 10.1038/sj.ejcn.1602489 |
| Popis: | To consider whether consumption of black tea has a positive or negative impact on health. Databases were searched for relevant epidemiological and clinical studies published between 1990 and 2004. Clear evidence was found for coronary heart disease (CHD), where an intake of ⩾3 cups per day related to risk reduction. The mechanism could involve the antioxidant action of tea polyphenols. While experimental models have suggested that flavonoids attenuated cancer risk, epidemiological studies failed to demonstrate a clear effect for tea, although there is moderate evidence for a slightly positive or no effect of black tea consumption on colorectal cancer. Studies on cancer were limited by sample sizes and insufficient control of confounders. There is moderate evidence suggestive of a positive effect of black tea consumption on bone mineral density although studies were few. There is little evidence to support the effect of tea on dental plaque inhibition but evidence to support the contribution of tea to fluoride intakes and thus theoretical protection against caries. There was no credible evidence that black tea (in amounts typically consumed) was harmful. Normal hydration was consistent with tea consumption when the caffeine content was |
| Databáze: | OpenAIRE |
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