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Blackberries, Onions, Red Wine: Flavonoid-Rich Foods To Combat Flu And Common Cold

Flavonoids are plant-based polyphenolic compounds that have a wide range of health benefits, including antiviral (to fight flu) and anti-influenza (to fight the common cold) activity. They not only help fight the pathogens but inhibit their replication, regulate the immune system and improves gut microbiome.

Flavonoids are commonly found in many fruits and vegetables; however, some foods have them in abundance. They are also the largest group of secondary metabolites found in foods, followed by phenolic acids and polyphenolic amides. Some of the essential flavonoids found in foods include flavones (apigenin, flavone, luteolin), isoflavones, flavonols (quercetin, kaempferol), flavanone glycoside (hesperidin), flavanols (catechins) and anthocyanins.

Fruits

1. Apple and its skin

Apple is rich in flavonoids such as kaempferol and quercetin while apple skin is rich in luteolin. All the three aforementioned flavonoids are known to have antireplicative and anti-infective effects against viruses and influenza viruses.

2. Red grape

The most common flavonoids found in red grape are anthocyanins, flavonols, catechin and proanthocyanidins. Anthocyanins are found only in red grapes compared to other grapes types.

3. Blackberries

Blackberries have strong antioxidative activity due to the presence of a large number of flavonoids such as flavone (luteolin), flavonols (myricetin and quercetin), flavanols (gallocatechin, epigallocatechin and catechin) and anthocyanidins (cyanidin).

4. Raspberries

They are rich in flavonoids such as quercetin and anthocyanins. The antioxidant activities of raspberries due to the presence of flavonoids. They may help prevent viral infections and treat cold and flu.

5. Orange

Flavonoids in orange may help improve symptoms of cold and flu such as nausea and cough. It contains flavonoids such as quercetin, apigenin and kaempferol. Orange juice is also rich in flavonoids and may help treat viral infections.

Vegetables

6. Red cabbage

Fresh and pickled red cabbages have the highest of flavonoids such as catechins, kaempferol, quercetin and apigenin. Cyanidin, a type of anthocyanins is the predominant flavonoid in red cabbages that helps treat many drug-resistant influenza viruses.

7. Carrots

Carrots are packed with vital flavonoids such as quercetin, myricetin, naringenin, kaempferol, rutin, apigenin and luteolin. These bioactive compounds possess antioxidative, anti-inflammatory and anti-viral properties.

8. Rutabaga

Rutabaga is a root vegetable also known by Swedish turnip or just ‘turnip’. It may help treat cold and flu symptoms such as the sore throat. When mixed with honey, rutabaga works as an expectorant and helps remove phlegm and cough.

9. Celery

Celery is rich in flavonoids like apigenin. It may help treat inflammation caused by influenza and rhinovirus and lower the symptoms of cold and flu such as sore throat, body ache and cough.

10. Onions

Fresh onions contain flavonoids such as flavonols, anthocyanins, dihydroflavonols, kaempferol, quercetin and apigenin. Experts suggest eating raw onions or lightly-fried onions to get the maximum of the benefits.

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