Now I know many families in America tend to throw away the skin (external layer) of an onion peel because they find no use of it. Well research recently showed that rather than adding them onto the tons of waste already in the U.S., the external layer could be used for other purposes as it was found to have fiber and other kinds of compounds.
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Onions also consist of what is called flavonoids which are rich sources of plant compounds. One of the most important one is called a quercetin which a strong anti-oxidant and inflammatory compound. Research also shows that by eating fiber that is on the external layer as well, one is able to have less of a chance of having cardiovascular diseases.
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Since onions are not animals, the are filled with plant cells which differ in many ways from a animal cell. One significant different is that plant cells have a rectangular shape as it has a cell wall on the outside of it to prevent loss of water, support the cell itself (let it have its structure), and is a filter.
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