4. A Boost for Immunity
Often called “nature’s multivitamin,” onions are rich in vitamin C, zinc, and quercetin—all essential for a strong immune system. Traditionally, onions have been used in home remedies to ease seasonal ailments:
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Their natural antimicrobial properties help fight infections.
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As an expectorant, they loosen mucus and soothe irritated throats.
It’s no surprise that onion-based syrups and broths have been passed down for generations during cold and flu season.
When Onions Might Not Agree With You
Despite their benefits, onions aren’t for everyone. Watch out for:
Digestive Sensitivity
Raw onions can cause bloating, gas, or heartburn, especially in those with IBS or acid reflux. Cooking onions thoroughly—sautéing, roasting, or caramelizing—breaks down the fibers (fructans) that cause discomfort, making them easier on the stomach.
Blood Pressure Interactions
Onions support cardiovascular health, but if you take blood pressure medication or have chronically low blood pressure, large amounts could cause dizziness or fatigue. Monitor your body’s response if you eat onions daily.
Food Pairing Notes
In Ayurvedic tradition, onions are sometimes avoided with honey or seafood, as these combinations are thought to cause indigestion. While science hasn’t confirmed this, some people notice improved digestion when avoiding certain pairings. Listen to your body.
How Much Should You Eat?
Moderation is important. Experts suggest ¼ to ½ cup of chopped onions per day—about what you’d add to a salad, soup, or stir-fry. This amount provides nutrients without overwhelming your system.
Eating too much may cause:
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Gas or bloating
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Occasional heartburn
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Strong breath or body odor (thanks to sulfur compounds)