Does onion count as 5 a day?

Online Answer
Onions form the base of many dishes, so you may forget that they can actually contribute to another one of your portions of vegetables for your 5-a-day, points out dietitian Ro. So onions do count as a vegetable, and not just a flavour enhancer. Who knew! Plus, they're low in calories and a source of fibre.
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Kept in the dark: Davison says your potatoes should be stored inside a paper bag in a cool, dark, dry place. And as mentioned above, away from onions and their sprout-encouraging gases.
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Keep them in the dark: Potatoes and onions are best stored in the dark in a cool place (separately of course).
Onions contain antioxidants and compounds that fight inflammation, decrease triglycerides and reduce cholesterol levels — all of which may lower heart disease risk. Their potent anti-inflammatory properties may also help reduce high blood pressure and protect against blood clots.
While the fridge isn't ideal for storing onions, it will extend the shelf life of whole, raw onions beyond a week at room temperature. Onions absorb moisture very easily however, so their texture may get somewhat soft in the fridge. Whole, raw onions can last in the fridge for up to two weeks.