Hey, do you like Onions?  They are one of my favorite vegetables.
Onions are very good. I love their close relatives garlic more though.
Onions have many health benefits including Vitamin C and potassium.  What about Garlic?
It's been used as a traditional medicine in China though I'm not sure how beneficial it really is.
Interesting.  I know Onions have been used as an anti inflammatory for centuries. 
That is a good point. Though its actual effectiveness has never been proven.
A powerful compound called quercetin in onions is known to play a significant role in preventing cancer.
Well there's lots of different cancers so it's hard to prove exactly how effective any one medicine is.
That is true, but Onions scavenge free radicals, thereby reducing your risk of developing gastric ulcers.
Very trye. I understand that their stability has issues at higher concernatratios though.