Can I have onions on keto?

Online Answer
ARE ONIONS CONSIDERED TO BE KETO? On the surface, no, onions are not a keto-friendly food item. They have no natural fat content, like all vegetables, and (nutritionally) are mostly carbohydrates. For reference, an average large onion contains 0g of fat, 14g of carbohydrates, and 2g of protein.
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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.