Grapes are woody vines of the Vitaceae family, with cylindrical branchlets, longitudinal ribs, and glabrous or sparsely pilose. Its fruit is spherical or oval, the flowering period is April-May, and the fruiting period is August-September.
Grapes are one of the oldest fruit tree species in the world. Plant fossils of grapes were found in the Tertiary strata, indicating that they were all over Europe, Asia and Greenland at that time.
The grape originates in western Asia and is cultivated all over the world. About 95% of grapes around the world are concentrated in the northern hemisphere.
Grapes are rich in nutritional value and are very nourishing fruits. Grape juice is known as "vegetable milk" by scientists. Grapes contain protein, carbohydrates, crude fibre, calcium, phosphorus, iron, potassium and other trace elements, as well as carotene, vitamin B1, and vitamin B2.
Let's take a look at the efficacy and role of grapes together!
1. Relieve hypoglycemia
The main component of grapes is glucose. When hypoglycemia occurs, we can eat some grapes or drink some grape juice, which can quickly relieve symptoms.
2. Prevention of blood clots
French scientists found that grapes can prevent thrombosis better than aspirin, can lower the serum cholesterol level of the human body, reduce the cohesion of platelets, and have a certain effect on the prevention of cardiovascular and cerebrovascular diseases.
3. Anti-aging
Grape seeds are a true antioxidant superstar. Anti-oxidation is an anti-ageing method, therefore, grape seeds can anti-ageing, and can remove free radicals in the body, so that you can stay young forever.
4. Relieves Allergy Symptoms
Grape skin contains a substance called resveratrol, which can inhibit the operation of inflammatory substances such as histamine and can effectively relieve allergic symptoms.
There is also a substance in grape skin called flavonoids, which can promote the increase of lipoproteins in the blood and reduce cholesterol levels.
What is hoarfrost on grapes?
When buying grapes, we often see a layer of hoarfrost on the grape skins, and it is difficult to wash them off with water. Some people are also worried about whether it is pesticide residue or harmful to the human body.
This layer of hoarfrost is a kind of sugar alcohol secreted by the grape itself or fruit powder. It is a purely natural substance synthesized by plants and is completely harmless to the human body.
Its main function is to reduce water evaporation and prevent grapes from losing water quickly after picking. Moreover, the fruit powder is insoluble in water, which can also avoid the humid environment on the surface of the grapes and reduce the infection of pathogenic bacteria.
Food taboo
1. Diabetics: Grapes contain a lot of fructose, which can easily cause blood sugar to rise for people with diabetes. Therefore, diabetics usually try not to eat grapes, and eating too many grapes can easily lead to diabetes in ordinary people.
2. Patients with diarrhoea: People with frequent diarrhoea should eat fewer grapes. Because grapes have the effect of helping digestion. If you have diarrhoea and then eat grapes, it will aggravate the symptoms of diarrhoea, so people with diarrhoea had better eat fewer grapes.
3. Grapes contain a lot of fruit acids, which are easy to retain in the mouth and teeth and will corrode for a long time. To better protect the teeth, we should rinse our mouths in time after eating grapes.
