Black tea consumption and risk of rectal cancer in Moscow population.

Purpose: This population-based case-control study (663 cases and 323 controls) examined the effect of black tea intake on the risk of rectal cancer in Moscow residents. The Moscow population was selected for its wide range of black tea consumption.

Methods: This study used three measures of tea consumption: the volume of beverage (l/month), zavarka (tea concentrate, l/month), and dry tea (g/month).

Reproducibility and relative validity of a questionnaire to assess intake of black tea polyphenols in epidemiological studies.

Epidemiological studies suggest that tea drinking may reduce the risk of cardiovascular diseases and cancers. Although tea is an important source of antioxidant phytochemicals, variation in preparation techniques may translate to variation in antioxidant capacity. However, most large-scale epidemiological studies use regular food frequency questionnaires to estimate tea intake, and nationally available nutrient analysis databases do not include levels of black tea polyphenols.

Tea intake and squamous cell carcinoma of the skin: influence of type of tea beverages.

Differences in tea drinking habits are likely to vary by populations and could contribute to the inconsistencies found between studies comparing tea consumption and cancer risk. A population-based case-control study was used to evaluate how usual tea consumption patterns of an older population (n = 450) varied with history of squamous cell carcinoma (SCC) of the skin. A detailed tea questionnaire was developed to assess specific tea preparation methods and patterns of drinking.

Association between glycated hemoglobin and diet and other lifestyle factors in a nondiabetic population: cross-sectional evaluation of data from the Potsdam cohort of the European Prospective Investigation into Cancer and Nutrition Study.

Background: Glycation reactions of proteins and other compounds, depending on blood glucose concentrations, have a detrimental effect on health.

Objective: The association of diet and other lifestyle factors with glycated hemoglobin (Hb A(1c)) values was examined in a nondiabetic population.

Design: This was a cross-sectional study of 1773 middle-aged men and women.