HealthBenefitsofCoffeeandTea茶和咖啡的好处PPT教案.pptx

HealthBenefitsofCoffeeandTea茶和咖啡的好处
Common Ground
Aside from plain water, coffee and tea are the most enjoyed beverages around the world. Both have things in them that may help your health, and they’re an excuse to get together with a friend -- that can be good for you, too.
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Coffee Basics
The beans grow on flowering trees found in more than 50 countries around the world, including the . (Hawaii). They’re roasted and ground, then boiled, dripped, steamed, or soaked to make coffee, depending on where you live and how you like it.
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Tea Basics
More than two-thirds of the world’s people drink this beverage, which is made from the leaf of a bush calledCamellia sinensis. You typically steep the leaves in steaming hot water for a few minutes then serve the tea hot or over ice.
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Green, Oolong, Black: What’s the Difference?
Tea makers dry and crush the leaves to bring out their oils, then they might expose them to air for a while, depending on the kind of tea they want to make. This is called “fermentation” -- it’s a chemical reaction that affects the flavor of the leaves and turns them brown.
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Green, Oolong, Black: What’s the Difference?
category
exposed time
caffeine
Green
never
almost no
Oolong
for a time
middle
Black
the longest
highest
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Health Benefits
antioxidation
lower blood sugar
against Parkinson’s disease
reduce heart disease
help your liver
less likely to have a stroke
prevent cancers
protect brain cells
prevent gallstones 
lose weight
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antioxidation
Free Radicals can damage your cells and lead to disease and illness. Your body makes them when it turns certain foods into energy and when sunlight hits your skin. You also can get them from things you eat and drink.
Tea and coffee help your body fight free radicals with chemicals of their own called antioxidants.
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lower blood sugar
Type 2 Diabetes
Both tea and coffee are linked to a lower chance of getting