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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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  • 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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Where is tea grown?

  • China

  • India

  • Japan

  • Sri Lanka

  • Taiwan

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Types of tea:

  • White Tea

    • Picked before leaf buds fully open

    • Leaves are bigger and lighter

    • Air dried

    • 3X antioxidants as green tea

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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

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Types of tea:

  • Oolong Tea

    • Oxidized more than green tea and less than black tea

    • Oxidized two to three days

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Types of tea:

  • Black Tea

    • Leaves completely oxidize

    • Oxidized between two weeks and one month

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Herbal “Tea”:

  • Not from Camellia Sinensis

  • Made from

    • Seeds

    • Roots

    • Flowers

    • Other parts of plants and herbs

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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

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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

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  • 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

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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

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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

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Tea and Cancer

The evidence was too limited in amount, consistency, or quality to conclude a role for tea in cancer

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

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  • 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

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Where is it grown?




Puerto Rico


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Coffee components

  • Diterpenes:

    • Cafestol and Kahweol

      • Anticarcinogenic properties

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Coffee components

  • Polyphenols

    • Lignins

    • Flavonoids

      • Anticarcinogenic properties

  • Chlorogenic acid

    • Slows release of glucose

      • Effect on insulin sensitivity

    • Antioxidant

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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

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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

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

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  • 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

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Caffeine effects

  • Factors affecting caffeine response

    • Body mass

    • Age

    • Smoking habits

    • Drug or hormone use

    • Stress

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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

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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