Onion and shrimp are not recommended to be eaten together, which may form calcium oxalate and produce stones.

Onions have many irreplaceable health benefits:

1, cancer prevention

The anticancer effect of onion comes from its rich selenium and quercetin. Selenium is an antioxidant, which can stimulate human immune response, thus inhibiting the division and growth of cancer cells and reducing the toxicity of carcinogens. Quercetin can inhibit the activity of carcinogenic cells and prevent the growth of cancer cells. According to a survey, people who often eat onions are 25% less likely to develop gastric cancer than those who don't, and 30% fewer people die of gastric cancer.

2. Maintain cardiovascular health

Onion is the only vegetable known to contain prostaglandin A. Prostaglandin A can dilate blood vessels and reduce blood viscosity, so it can lower blood pressure, increase coronary blood flow and prevent thrombosis. Quercetin, which is rich in onion, has high bioavailability. Scientists report that quercetin may help prevent the oxidation of low density lipoprotein (LDL) and provide important protection for atherosclerosis.

3. Stimulate appetite and help digestion

Onions contain allicin, which has a strong aroma. When processing, it often makes people cry because of its pungent smell. It is this special smell that can stimulate gastric acid secretion and increase appetite. Animal experiments have also proved that onion can improve gastrointestinal tension and promote gastrointestinal peristalsis, thus playing an appetizing role, and has obvious curative effect on anorexia caused by atrophic gastritis, insufficient gastric motility and dyspepsia.

4, sterilization, cold

Onion contains phytoncide, such as allicin, which has strong bactericidal ability and can effectively resist influenza virus and prevent colds. When this phytoncide is excreted from the body through respiratory tract, urinary tract and sweat gland, it can stimulate the secretion of cell wall in these parts, so it has expectorant, diuretic, sweating, bacteriostatic and antibacterial effects.

Tip: Purple onions are more nutritious.

Onions can be divided into white skin, yellow skin and purple skin according to skin color. From the nutritional value, purple onion is more nutritious. This is because purple onion tastes more spicy than the other two onions, which means it contains more allicin. In addition, the purple part of purple onion contains more quercetin.

Grams of food stage

1, onion and honey

Onions and honey can't be eaten together. Eating together is not good for eyes, it will cause eye discomfort and even lead to blindness.

2. Onions and kelp

Onion and kelp can't be eaten together, kelp is rich in iodine and calcium, onion contains oxalic acid, and eating onion and kelp together is easy to form stones.

3. Onions and fish

Onions and fish can't be eaten together. Fish is rich in protein. Onions and fish can be eaten together Oxalic acid in onion will decompose and destroy the rich protein in fish, making it precipitate, which is not easy to be digested and absorbed by human body.