The Exam Room by the Physicians Committee

Health Benefits of Onions: Strong Heart, Long Life | Dr. Hana Kahleova

Mar 17, 2026
Dr. Hana Kahleova, physician and lead researcher in cardiometabolic health and longevity, describes the science behind onions. She covers antioxidant quercetin, effects on nitric oxide and blood flow, impacts on insulin sensitivity and liver fat, links to lower cancer and heart risk, and practical advice on regular, small servings.
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ANECDOTE

Host’s Strong Onion Aversion

  • Chuck Carroll admits he strongly dislikes onions, calling them his least favorite food and joking about picking them off his plate.
  • This personal bias frames the episode and contrasts with Hana Kahleova's enthusiasm.
INSIGHT

Onion Quercetin Lowers Cellular Oxidative Stress

  • Onions are rich in quercetin, a potent antioxidant that reduces cellular oxidative damage.
  • An 8-week trial gave 24 women 100 mL onion juice and showed increased antioxidant capacity and improved bone mineral density.
ANECDOTE

Childhood Onion Juice Remedy

  • Hana Kahleova recalls her father juicing onions as a home remedy and sweetening with orange juice to treat infections.
  • She reports it sped recovery and highlights cultural uses of onion juice.
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