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Here are some health related points about flavonoids...
1 Flavonoids are the substances that give color and flavor to plant foods 
2 To get the most flavonoids eat a variety of fresh fruits and vegetables every day 
3 Most flavonoids are powerful antioxidants. Many are also helpful for preventing or treating specific health problems such as asthma or eye problems.
4 Carotenoids including beta carotene and lycopene are powerful antioxidants.         Lycopene may help prevent prostate and lung cancer.
5 Other important flavonoids include quercetin found in onions, and catechins found in tea.
6 Garlic contains many flavonoids and other valuable substances as do red wine, blueberrie and citrus
 prevent or treat specific health problems such as asthma or eye problem OF PLANT.

they are used to give colour and flavour to plants.

flavanoids are usually very powerful antioxidants.

they are also used in many fruits and vegetables which we eat everyday.