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Coffee and Tea: Impact on cancer risk

Coffee and Tea: Impact on cancer risk. How much tea do you consume daily? Why do you drink tea?. tea:. All tea comes from plant Camellia Sinensis White Green Oolong Black Type of tea is determined by: When harvested Amount of oxidation Process undergone.

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Coffee and Tea: Impact on cancer risk

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  1. Coffee and Tea:Impact on cancer risk

  2. How much tea do you consume daily?Why do you drink tea?

  3. tea: • All tea comes from plant Camellia Sinensis • White • Green • Oolong • Black • Type of tea is determined by: • When harvested • Amount of oxidation • Process undergone http://www.naturalhealthcarestore.com/

  4. Where is tea grown? • China • India • Japan • Sri Lanka • Taiwan http://www.teekampagne.de/

  5. Types of tea: • White Tea • Picked before leaf buds fully open • Leaves are bigger and lighter • Air dried • 3X antioxidants as green tea http://en.wikipedia.org/wiki/

  6. Types of tea: • Green Tea • Undergone minimal oxidation during processing • 5-40% oxidized • Heat immediately through steam or dry cooking pans • Processed within one to two days of harvesting

  7. Types of tea: • Oolong Tea • Oxidized more than green tea and less than black tea • Oxidized two to three days

  8. Types of tea: • Black Tea • Leaves completely oxidize • Oxidized between two weeks and one month

  9. Composition varies according to: • Growing season • Strain or variety • Storage • Brewing conditions http://www.farawayholidays.co.uk/faraway/cameron_highlands/

  10. Herbal “Tea”: • Not from Camellia Sinensis • Made from • Seeds • Roots • Flowers • Other parts of plants and herbs http://www.northeastcoffeeco.com/

  11. Tea components • Polyphenols • Catechins • Powerful antioxidants • Slow oxidative damage to cells • White and green tea contain highest levels of ECGC • Least processed • Theaflavins and Thearubigins (1,2) • Highest in oolong and black tea • More processed

  12. Green Tea and Breast cancer • Women in Shanghai China • 20-74 years of age • 3454 cancer cases • 3474 control • Participants interviewed for: • Initial age of tea drinking • Amount consumed • Brew strength • Quality of tea

  13. Results • Regular green tea drinkers had 12% lower risk for breast cancer • Green tea drinking for <6 years associated with significantly reduced risk among postmenopausal women • Amount of dry tea leaves consumed per month showed trend toward decreased risk in premenopausal women • Conclusion • Green tea may be weakly associated with a decreased risk of breast cancer

  14. Meta Analysis of Tea and Breast Cancer Risk • Majority of research suggests a modest reduction in risk of developing breast cancer with green tea consumption • More than 3 cups of green tea per day slightly reduced risk of breast cancer recurrence in women with breast cancer

  15. Lung Cancer prevention: • 22 studies reviewed • Green tea and black tea consumption with lung cancer risk • Results • Green tea consumption of two cups/day associated with 18% decreased risk of lung cancer • No protective effect for black tea

  16. Tea and Cancer The evidence was too limited in amount, consistency, or quality to conclude a role for tea in cancer

  17. What about coffee?

  18. How much coffee do you consume daily?Why do you drink coffee?

  19. Coffee • Brewed drink • Prepared from roasted seeds of the coffee plant • Grows on shrubs, or small trees • Pit inside red or purple fruit • Known for high caffeine content

  20. Indonesia Hawaii Colombia Where is it grown? Mexico Brazil Guatemala Puerto Rico Kenya http://www.ncausa.org

  21. Coffee components • Diterpenes: • Cafestol and Kahweol • Anticarcinogenic properties

  22. Coffee components • Polyphenols • Lignins • Flavonoids • Anticarcinogenic properties • Chlorogenic acid • Slows release of glucose • Effect on insulin sensitivity • Antioxidant

  23. Coffee and Gastric Cancer Risk • More than 3 cups of coffee per day slightly increased risk of gastric cardia cancer, but not non-cardia cancer • More than 3 cups of coffee per day had no affect on risk of cancer of the pharynx, larynx, or esophagus

  24. Coffee and ColoRectal Cancer • Consumption of caffeinated coffee had no affect on colon or rectal cancers in men or women • Consumption of two cups of decaffeinated coffee significantly reduced risk of colon and rectal cancers in both men and women

  25. Caffeine’s role in tea, coffee, and cancer

  26. How much Caffeine do you consume daily?Why do you drink caffeinated Drinks?

  27. Caffeine • Stimulates central nervous system • Makes you more alert and boosts energy • Used in pain relievers • Too much can cause: • Restlessness • Anxiety • Irritability • Headaches • Withdrawal symptoms 500-600 mg per day is considered to be safe

  28. Caffeine effects • Factors affecting caffeine response • Body mass • Age • Smoking habits • Drug or hormone use • Stress

  29. Soft Drinks and Cancer Risk • No correlation between soft drink consumption (>1 can per day) on cancers of the mouth, pharynx, larynx, esophagus or stomach • High sugar content of soft drinks may lead to increased body fat that would increase risk of some cancers

  30. Coffee, Tea, & Caffeine • No increased risk and potentially decreased risk of cancer associated with coffee and tea consumption • Further research needed • Coffee and tea are healthy beverages • Monitor caffeine and sugar content of beverages

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