The primary issue with onions at night is digestive timing. Because digestion slows down while you sleep, the sulfur-containing compounds and natural fructans in onions can cause issues when you lie flat.
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Acid Reflux & Heartburn: Onions can relax the lower esophageal sphincter, making it easier for stomach acid to creep up—especially for those with GERD.
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Gas & Bloating: The complex fibers (fructans) can ferment in the gut, leading to pressure and physical discomfort.
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Stomach Irritation: For sensitive individuals, the “kick” that makes onions tasty can keep the nervous system too alert to relax.
The Surprising Benefits for Relaxation
It isn’t all bad news. Doctors also note that onions contain specific nutrients that theoretically support sleep:
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