current position：Home>Onions are edible heart stents? Cancer prevention and hypoglycemic! Purple skin and white skin are very different!
Onions are edible heart stents? Cancer prevention and hypoglycemic! Purple skin and white skin are very different!
2022-05-07 16:18:47【Popular science China】
Eating onions raw can protect blood vessels 、 The idea of lowering blood pressure has a long history , So that some people say onions are edible “ Heart stents ”.
You know what? ？ Studies have found that onions can also reduce blood sugar ！
Who experts found that , The reason why Pakistanis are not prone to diabetes , It has something to do with their love of onions . Investigation found , Pakistanis eat at least two per person per day （ about 400 g ） Onions .
Onions do not lower blood sugar levels in healthy non diabetes people , But eating a lot of onions can reduce the blood sugar level of diabetes patients .
Purple onion or white onion has higher nutritional value ？ Is it best to eat raw or cooked ？ Let's go to science today .
What are the other benefits of eating onions ？
Onion belongs to Liliaceae , Also known as ball onion 、 Green onion 、 Jade onion .
By leaf 、 Stem and root composition , We usually eat “ Onions ” It's its scaly stem —— bulb , That is, onions .
Onions store most of the nutrients of onions , Therefore, its nutrition is also very rich . In addition to containing carbohydrates 、 protein 、 Water soluble vitamins and calcium 、 iron 、 Selenium and other minerals , It also contains a variety of nutrients with unique biological activities —— Sulfur compounds 、 Flavonoids 、 Steroids 、 Polysaccharide 、 Phytochemicals such as prostaglandins .
These nutrients make onions have high nutritional value and health effects . Onions have antibacterial properties 、 antioxidant 、 Lower blood sugar 、 Fall hematic fat 、 Cholesterol lowering and other effects , For cardiovascular disease 、 diabetes 、 cancer 、 osteoporosis 、 Obesity and other diseases can also improve .
Onions can prevent cancer ？
It's edible “ Heart stents ”？
The study found that , A variety of ingredients in onion have the function of tumor prevention .
Selenium can induce apoptosis of tumor cells , Inhibit tumor angiogenesis ;
Quercetin can inhibit the proliferation of tumor cells 、 adhesion ;
Allyl sulfide blocks cancer cells DNA The formation and replication of , Effectively inhibit gastric cancer 、 Cancers such as esophageal cancer and colon cancer ;
Flavonoids can scavenge free radicals , Inhibit the growth of tumor cells such as liver cancer and colon cancer .
It is also found in population studies , Increasing the intake of Allium vegetables, including onions, can reduce gastric cancer 、 colorectal cancer 、 esophageal cancer 、 The risk of cancers such as prostate cancer .
In cardiovascular disease , Onions also have “ Heart stents ” The laudatory name .
prostaglandin A Can dilate blood vessels 、 Reduce blood viscosity 、 Prevent thrombosis ;
S- Propylcysteine 、S- Methyl cysteine sulfoxide 、 Amino acids such as cyclic garlic amino acids can reduce the content of cholesterol in the blood ;
Flavonoids have strong antioxidant capacity and can remove a large number of free radicals in the blood , Reduce the harm of free radicals to blood vessels .
Onions contain a variety of nutrients that protect cardiovascular health through a variety of ways .
Which people are not recommended to eat onions ？
The high content of irritant substances in raw onions will stimulate the gastric mucosa , Cause gastrointestinal discomfort , So gastritis 、 Raw onions are not recommended for patients with gastric ulcer and duodenal ulcer .
Raw onions irritate the stomach , But that doesn't mean it's okay to eat cooked onions . Whether raw or cooked , After eating onions, the intestines and stomach are easy to produce gas , Cause abdominal distension and abdominal pain , Therefore, patients undergoing gastrointestinal surgery are not recommended to eat onions .
Besides , People with allergic constitution and patients with skin pruritus are also not recommended to eat onions .
violet 、 yellow 、 Which kind of white onion is better ？
Onion varieties can be divided into purple according to the color of onion skin 、 Yellow and white varieties .
The main differences between the three are ：
● In terms of nutrients , Purple onions are rich in anthocyanins , Allicin and quercetin are also higher ; Yellow and white onions are rich in carotene , vitamin C High levels of .
● On the taste , The purple onion is thin , It's spicy ; White onions have a high moisture content , The meat is thick , Less spicy ; Yellow onions are also less spicy , The taste is purple and white, sweet .
● White and yellow onions with light spicy taste are very suitable for eating raw , And the spicy flavor is suitable to be used as seasoning . Therefore, when selecting onion varieties, you can choose according to the eating method and the taste you like .
When buying onions, you also need to pay attention to the following points ：
First , Observe the appearance of onions . The onion skin is dry and intact without decay , Onion root is dry, no new root buds sprout , That means onions are well stored .
secondly , Be sure to pinch the onions before you buy them , Feel the onion texture . The harder the handle, the higher the water content of the onion , The fresher .
Tears flow when cutting onions , Everyone must have experienced . This is because , When cutting onions , Onion cell rupture releases alliinase, which reacts with amino acids to produce thiopropionaldehyde -S- oxide . And thiopropionaldehyde -S- Oxides are volatile and diffuse in the air , After contact with the eyes, it can stimulate the free nerve endings on the cornea , Stimulate the lacrimal gland to shed tears .
So I want to cut onions without tears , You can try the following methods ：
One 、 Refrigerate the onions before cutting them , Lower the onion temperature , To slow down thiopropionaldehyde -S- Volatilization of oxides .
Two 、 Cut the onions and soak them in water for a while , Because thiopropionaldehyde -S- Oxides are easily soluble in water , Soaking in water also reduces thiopropionaldehyde -S- Volatilization of oxides .
3、 ... and 、 The easiest way is to wear goggles .
author[Popular science China],Please bring the original link to reprint, thank you.
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