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Onions are vegetables that grow as underground bulbs at the base of plants known scientifically as Allium cepa. And also known as bulb onions or common onions, they are grown worldwide, and are closely related to chives, garlic, scallions, shallots and leeks. Onions may have several health benefits, mostly due to their high content of antioxidants and sulfur-containing compounds, It may also surprise you that it has health effect too.
The Good Of Onions
• Onion extracts and essential oils suppresses the growth of harmful microorganisms, such as bacteria and yeasts .
• Onion regulates blood sugar level.
• Consumption of onions reduces risk of several types of cancers, such as stomach-, breast-, colon- and prostate cancers.
• Onion contains an antioxidant vitamin that is needed for immune function and maintenance of skin and hair.
• Onions a water-soluble B-vitamin that is essential for cell growth and metabolism, and is especially important for pregnant women.
• Onions contains potassium and this essential mineral can have blood pressure-lowering effects, and is important for heart health.
The Bad Of Onions
• Eating onions can lead to bad breath and an unpleasant body odor.
• The most common issue with preparing and cutting onions is eye irritation and tear production.
• Consumption of raw onions can worsen heart bum.
• Eating large amount of green onions may interfere with blood thinning drugs.
• Onions may cause adverse digestive effects in some people,
• While onions are a healthy component of the diet of humans, they can be deadly for some animals, including dogs, cats, horses and monkeys.

I add onions when cooking beans, it makes it cook faster since it contains potassium.