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

The Exam Room by the Physicians Committee

Physicians Committee

Nutrition, Medicine, Health & Fitness

4.9 • 3.5K Ratings

🗓️ 17 March 2026

⏱️ 36 minutes

🔗️ Recording | iTunes | RSS

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Summary

Onion health benefits may be more powerful than you think.

In this episode of The Exam Room, Dr. Hana Kahleova joins Chuck Carroll to break down the science behind onion health benefits and explains how this humble vegetable may protect your heart, improve blood sugar, reduce liver fat, and even support longevity.

Here's what the science says about onion health benefits:

🧅 Red onions may reduce liver fat by more than 16% in just 12 weeks
🧅 Onions can improve insulin sensitivity and lower post-meal blood sugar
🧅 Quercetin in onions may reduce inflammation and oxidative stress
🧅 Onion compounds help support nitric oxide and healthy blood flow
🧅 Higher intake of onions and garlic is linked to lower cardiovascular and colon cancer risk

Dr. Kahleova explains how onions work inside the body — from protecting your arteries to supporting metabolic health — and why frequency matters more than eating large amounts at once.

Whether you love onions or you're like me and pick them off your plate, this episode will change how you see their health potential.

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👉 https://www.youtube.com/watch?v=10rxbSneeJ4

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The Physicians Committee is dedicated to saving lives through plant-based diets and ethical and effective scientific research. We combine the clout and expertise of more than 17,000 physicians with the dedicated actions of more than 175,000 members across the United States and around the world.

Transcript

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0:00.0	Today on the exam room.
0:04.0	In one study that lasted 12 weeks, the litter fat was reduced by 16.5%, which is remarkable in only 12 weeks,
0:16.0	by just taking quercetin from onions. And in another study, they tested 100 grams of red onion, and they showed that the red onions
0:26.6	were able to reduce the blood sugar response in people with type 1 diabetes.
0:37.3	Welcome to the exam room podcast, brought to you by the Physicians Committee.
0:41.3	Hi, I'm Chuck Carroll, raising health IQs coast to coast and around the world.
0:46.4	Hi to the exam room is listening in Helena, Montana, Dover, Delaware, and Ljubljana, Slovenia.
0:53.6	Wherever you are, we appreciate you helping to make the world
0:56.2	a healthier place. This is episode 21 of season 9, number 720 overall. And today we are talking about
1:04.5	a food that has the power to make a grown man cry. Today is all about the onion. That's right, onions from shallots to
1:14.7	vidalias to yellow to white to red, all of the onions. But before we go any further, I need to
1:20.9	confess something right up front. I honestly do not like onions, not even one little bit. It's a taste thing for me.
1:29.3	But science could not possibly care any less about my taste buds.
1:35.3	Because according to my guest today, onions may be one of the most powerful foods that you can put on your plate.
1:40.3	And they power up your heart, your blood sugar, your liver, even increase the number of
1:46.9	years that you live. Yeah, onions are tied to longevity. So today we are taking a deep dive
1:52.6	into the health benefits of onions, everything from reducing oxidative stress and inflammation
1:57.7	to improving insulin sensitivity and supporting healthy blood flow.
2:02.9	And then also a little bit later on in the show, I'm going to tell you where you can score
2:06.8	some amazing plant-based health books, including a few from Dr. Neil Barnard, like The Cheese Trap.
2:14.6	And where simultaneously at the same place, you can get one of the best healthiest
2:20.2	smoothies i have had ever in the great state of maryland this is a local spot making a big
	...

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