View
2.860
Download
1
Category
Preview:
Citation preview
Health Benefits of Green tea
K. M. JayasinghaDepartment of Food Science and TechnologyUnivesity of Peradeniya
2
Introduction
• Tea plant is Camellia sinensis. • Tea likely originated in China. • Tea is an aromatic beverage.• Tea has a cooling, slightly bitter, and
astringent flavour.
3
Types of tea
• Green tea• Black tea• Oolong tea• White tea• Pu-erh tea
4
Green tea
• Green tea has greenish-yellow colour and slightly astringent flavor.
• Green tea has a too high content of polyphenols.
• Green tea is a medicine and a healthful beverage.
5
Green tea processing Tea leaves
Partial withering
steaming
Rolling and drying
Final frying
Green tea
6
Composition of Green Tea
• Proteins• Carbohydrates• Lipids• Vitamins• Pigments• Volatile compound• Minerals• Xanthic bases• Polyphenol compounds
7
Nutritive value of Green Tea
• The caffeine content is lower than other drinks.
• Green tea contains antioxidant compounds.
• Minerals in green tea play major role to increase nutritive value.
8
Green tea and human health• Antioxidant activity• Antimutagenic and anticarcinogenic potential • Anti-hypertensive effect and cardiovascular disease
risk• Oral health• Solar ultraviolet protection• Body weight control• Glucose tolerance and Insulin sensitivity
9
Antioxidant activity
• Green tea is a source of antioxidant nutrients.
• Green tea is rich in polyphenols.• Catechins and garllic acid are major
polyphenols in green tea.• It protect against oxidative damage in
body.
10
Antimutagenic and anticarcinogenic potential
• Green tea polyphenols increase antimutagenic activity of green tea.
• Green tea inhibit many cancers in the body. They are,
• Lung cancer• Breast cancer• Ovarian cancer• Stomach cancer• Skin cancer
11
Anti-hypertensive effect and cardiovascular disease risk
• Green tea reduces blood pressure.• Green tea reduces cardiovascular disease
risk.• The oxidation of LDL-cholesterol is
inhibited by green tea.• Green tea increases the levels of HDL-
cholesterol.
12
Oral health• Green tea consumption reduces dental caries.• Green tea is a natural source of Fluoride.• Fluoride prevents tooth loss and oral cancer.
Solar ultraviolet protection
• Catechin is a protector agent against some types of radiation.
• It prevents skin disease, photoaging and potential cancer problems.
13
Body weight control• Polyphenols has a potential to control body
weight.
Glucose tolerance and Insulin sensitivity
• Green tea has an effect on glucose tolerance and insulin sensitivity and green tea increases insulin activity.
14
Harmful effects of tea over consumption
• The negative effects of caffeine Theophylline are nervousness, sleep disorders, vomits, headaches, epigastric pain, tachycardia.
• Green tea should not be taken by some patients suffering heart problems.
15
THANK YOU
Recommended