The advantages and disadvantages of coffee to wake up the brain to help the college entrance examination

What's coffee?

The word "Coffee" comes from a small town in Ethiopia called kaffa, and in Greek "Kaweh" means "strength and passion". Tea, coffee and cocoa are called the three major drinks in the world.

Coffee tree is a small evergreen tree of Rubiaceae, native to Ethiopia. Small evergreen trees or shrubs of tropical and subtropical regions. Leaves long ovate, flowers white, bearing crimson berries. There are small fruit, medium fruit, big fruit coffee and so on. The seeds are fried and crushed into powder to make a drink, which has an exciting effect.

The advantages and disadvantages of coffee are refreshing and refreshing in the college entrance examination.

Daily coffee is made from coffee beans combined with a variety of cooking utensils, and coffee beans refer to the nuts in the fruit of a coffee tree, which are then roasted with appropriate roasting methods.

Coffee is a drink made from coffee beans into powder and brewed with hot water. It tastes bitter, but it has a special aroma. It is one of the main drinks for westerners. It originated in tropical Africa, and now it is also cultivated in Yunnan, Guangdong and other provinces of China. Its seeds are called "coffee beans". Fried flour can be used as a drink, that is, coffee.

The main ingredients of coffee

Caffeine: it has a particularly strong bitter taste and stimulates the central nervous system, heart and respiratory system. Appropriate amount of caffeine can also reduce muscle fatigue and promote digestive juice secretion. Because it promotes kidney function, it is diuretic and helps the body to expel excess sodium ions from the body. But eating too much can lead to caffeine poisoning.

Tannic acid: the boiled tannic acid will decompose into pyrouric acid, so the coffee that has been brewed for too long will taste worse.

Fat: the most important ones are acid fat and volatile fat.

Acidic fat: that is, fat contains acid, its strength will vary according to the type of coffee.

Volatile fat: is the main source of coffee aroma, it is a kind of aroma will emit about 40 kinds of aromatic substances.

Protein: the main source of calories, the proportion is not high. Most of the protein in coffee powder will not dissolve out when brewing coffee, so the intake is limited.

Sugar: coffee beans contain about 8% sugar. After baking, most of the sugars are converted to caramel, which browns the coffee and combines with tannins to produce sweetness.

Fiber: the fiber of raw beans will be carbonized after baking and combine with caramel to form the hue of coffee.

Minerals: contains a small amount of lime, iron, phosphorus, sodium carbonate and so on.