Coffee shop related knowledge and common sense.
First, will the skin turn black after drinking coffee?
A: So far, there is no research result showing that melanin in coffee is absolutely related to melanin in skin. On the contrary, caffeine can accelerate metabolism, promote digestion, improve constipation, and from these functions, it can also help the skin to change roughness. Speaking of caffeine can accelerate metabolism, it is said that coffee can accelerate the burning of calories and achieve the effect of losing weight. Basically, this theory is correct, but this kind of calorie burning won't make you lose much weight. If sugar and creamer are added to coffee, it is even more inconsistent with the principle of losing weight in terms of calories.
Second, how should coffee beans be stored?
A: Improper preservation methods will affect the quality and flavor of coffee. Generally speaking, the shelf life of coffee after opening-coffee beans are four weeks, and coffee powder is slightly shorter. Vacuum-packed coffee beans can be kept for four months if they are not opened. In order to minimize the physical and chemical changes of coffee, storage and packaging is a university question. Coffee beans bought home should be stored in a sealed container, which can be refrigerated in the refrigerator. Remember to sprinkle a small amount of salt in the bucket where the coffee is stored (don't take away the bag that packs the coffee, lest the coffee and salt mix together to make the coffee taste salty), which will help to preserve the aroma of the coffee.
It is best to choose a breathable bag when buying, and add a one-way breathable hole on the sealed package, so that the gas of beans or coffee powder can be discharged, but the outside air can't enter. Because the shelf life of coffee powder is shorter than that of coffee beans, grinding before brewing coffee helps to ensure the freshness of coffee beans and maintain the aroma of coffee.
3. Will coffee lead to calcium loss?
A: In recent years, due to the propaganda of medical care, many people began to pay attention to the problems of calcium loss and osteoporosis. As for the relationship between caffeine intake and osteoporosis, it is still under continuous study. At present, there is no direct evidence that caffeine will lead to osteoporosis, but some studies have pointed out that caffeine will increase calcium excretion, so the current suggestion is that coffee lovers should eat more foods with high calcium content to supplement calcium. If they can drink milk before drinking coffee, they can also make the original calcium loss in their bodies less.
4. Excuse me, is iced coffee (such as IcedMocha and IcedCappuccino) cooked with iced coffee beans or this kind of coffee beans with ice cubes?
Answer: Iced coffee is cooked with iced coffee beans, and it is most suitable to add ice cubes after cooling (at room temperature). If you add ice cubes to cool down after cooking, if the ice cubes dissolve too much in the coffee, the coffee will become too thin. IcedMocha refers to a drink with chocolate syrup added to iced coffee. Mocha means coffee and chocolate in English. IcedCappuccino means that iced coffee has a special flavor besides sugar and milk, so it has a special taste.
5. Is it right to drink coffee while it is hot?
A: Some people say that the best drinking time of hot coffee is 85 degrees Celsius, and it is not good when it is cold. In fact, if it is a good cup of coffee, the taste performance should be consistent when the temperature is high and the temperature is low, which is why the appraisers who test coffee will list the whole process of coffee from hot to cold as an evaluation. A cup of coffee with good quality, after cooling, not only the aroma decreases, but also the taste of coffee is even better than that of warm coffee. Just because of the instability of coffee, some people encourage drinking it while it is hot, so as not to affect the flavor of coffee after cooling. On the other hand, when a steaming cup of coffee is served to you, drinking it while it is hot is a courtesy and a response to the barista's intention.
6. Why can I feel a little sweetness in black coffee without sugar?
A: It is generally believed that coffee beans have only three flavors: bitter, sour and astringent. In fact, the sugar content of raw coffee beans is about 5% ~ 8%. After baking at high temperature, most of the sugar will be converted into caramel. This caramelization brings a unique brown color to coffee, forming a source of fragrance and bitterness; The remaining sugar will leave a little sweetness. In addition, when roasted coffee beans, the released tannic acid and brown caramel combine to produce a slightly bitter sweetness.
Seven, why is it easy to fall asleep when drinking coffee?
A: Many people have the experience of being unable to sleep because of high spirits after drinking coffee. This is because there is something called adenosine in the human body, which is a conductive substance to control nerve activity, which can slow down breathing, weaken mood and reduce gastric acid secretion and urination demand. Caffeine contained in coffee will fake adenosine, making the body think that adenosine has already happened, but in fact adenosine has not been recycled, so there is no depression, so instead, I feel energetic, my stomach acid increases and I have frequent urination. Because of emotional excitement, I will feel more awake and naturally it is not easy to fall asleep. It is worth noting that the short-term wakefulness caused by caffeine does not mean physical strength. Because everyone has different metabolic rate and sensitivity to caffeine, some people still don't feel that their sleep is affected after drinking coffee.
8. What water should I use to make coffee?
A: About 98% ~ 99% of a cup of coffee is water, so to brew delicious coffee, just like brewing and making tea, good water quality can show the fragrance of coffee. So, does mineral water taste better with coffee? Because mineral water is mostly hard water with high content of sodium, manganese, calcium and magnesium, hard water will hinder the release of caffeine and tannic acid, which will greatly reduce the taste of coffee. In addition, to avoid using water with the smell of disinfectant gas, you can use the water boiled for the second time and the water just flowing out of the faucet in the morning. The best way to make coffee is to heat boiling water on a gas stove, with a little carbon dioxide in it.
What is a good cup of coffee?
A: Coffee is a personalized drink. As long as the coffee beans used are of good quality, fresh and professionally roasted, any coffee that meets your taste is good coffee. A good cup of coffee does not depend entirely on the origin and brewing method of coffee beans. It depends on the personality and taste preference of the drinker. For example, we can often see people drinking American coffee in American restaurants or movies. American coffee is sometimes described as "sock washing water" because of its light taste, but these people enjoy it. It can be seen that the judgment of good coffee depends entirely on personal preference and is an absolute personal idea.
X. What are the "three original species" of coffee?
A: There are at least 40 species of coffee among many plants on the earth, but the more practical cultivated species are three original species, namely Arabica, Rob, Robuste La and Bereka. Now this order is their quality order. Arabica has the best fragrance, and its caffeine content is only half that of Robusta. At present, Arabica species accounts for 70% ~ 80% of the world's total output, while Robusta species is resistant to high temperature, drought and humidity, with strong adaptability and low cost, and its output also accounts for 20% ~ 30% of the total output. Liblica is bitter because of its poor fragrance, except for producing countries and a few Europeans.
XI。 How to taste coffee?
A: Drinking coffee should be like tasting a glass of wine. Only by savoring it carefully can we appreciate its essence. No matter how the coffee is cooked, you don't have to rush into your stomach. First smell the original aroma of coffee, then take a sip to try the original flavor, then add the right amount of sugar according to your personal preference and stir with a small spoon. While stirring the coffee vortex, slowly add creamer and let the oil float on the coffee. On the one hand, it can keep warm, on the other hand, the heat of coffee can evaporate the milk flavor. Drink coffee while it is hot, because the taste and aroma of coffee will decrease with cooling. When drinking coffee, you should not only drink it at the right temperature, but also drink it in moderation. Usually it takes about seven or eight minutes to pour into the cup. Just the right amount, not only makes the taste vivid, but also tastes neat and light. Follow this way of tasting, and the coffee you taste will become more delicious.
Is "black coffee" the best way to taste coffee?
A: There is a saying that an expert who knows how to drink "black coffee" without cream or sugar is an expert who tastes coffee. In fact, there is no fixed and correct way to drink coffee. Coffee Lane in Ethiopia, the hometown of coffee, is also characterized by adding spices such as ginger and cinnamon. For a good cup of coffee, the taste of black coffee can really enjoy its original balanced and rich flavor, while sugar and creamer can make up for some shortcomings of coffee. For example, creamer can remove a little astringency, and adding sugar can turn bitterness into sweetness.
Thirteen, pregnant women can drink coffee?
A:
1980, the US Food and Drug Administration (FDA) issued a statement advising women who are pregnant or may be pregnant to reduce caffeine intake. However, many subsequent research results show that there is no evidence that moderate caffeine will have adverse effects on the fetus, and there is no medical report prohibiting pregnant women from drinking coffee. However, the FDA did not change the original advice, because in the middle and late pregnancy, pregnant women will metabolize caffeine about twice as fast as those who are not pregnant, and caffeine will also flow into the baby through breastfeeding. Therefore, pregnant women and mothers are advised to be more cautious about caffeine intake.
Why do some coffees taste sour?
A: Whether coffee tastes sour is mostly due to the variety of coffee. Some coffees are highly acidic, such as Kenya, Mocha, Colombia, Guatemala and Costa Rica. The degree of roasting is also related to the acidity of coffee. Usually, lightly roasted coffee beans also contain organic acids, so the brewed coffee tastes sour. Deep-fried coffee beans have low acidity because high temperature has released organic acids contained in coffee beans. Too many times of stirring when making coffee (especially when using "choking wind") or the brewed coffee stays on the insulation plate for too long are the reasons that lead to the coffee becoming sour.
Fifteen, how to buy coffee beans?
A: No matter what kind of coffee beans, freshness is an important factor affecting the quality. When buying, grab one or two coffee beans and chew them in your mouth. If the coffee beans are crisp and intact (indicating that the coffee beans are not wet) and the teeth and cheeks are fragrant, it is best to pinch them by hand to see if they feel solid, instead of buying empty-shell coffee. If the coffee bean has lost its fragrance or smells stale, it means that the coffee bean is no longer fresh and is not suitable for purchase. Freshly fried coffee beans are not suitable for immediate drinking, so they should be stored for a week to allow the gas in the beans to be completely released. Generally speaking, the best drinking period of coffee is one week after frying, when the coffee is freshest and has the best aroma and taste.
In addition, the purity of coffee beans is another consideration. Experts choose coffee not necessarily by the particle size, but by grabbing a handful of RegionalCoffee, about dozens, to see whether the color of each single bean is consistent and whether the particle size and shape are similar, so as to avoid buying inferior products disguised as mixed beans. But if it's BlendedCoffee, it's normal to have different sizes and colors. In addition, fire and deep roasting will make coffee beans oil, but if the lightly roasted coffee beans oil, it means that they have deteriorated, which not only reduces the mellow degree, but also leads to astringency and sour taste. In a word, we should pay attention to the freshness, aroma and bad taste when purchasing coffee. The ideal purchase amount is to finish it in half a month.
Sixteen, how to brew coffee with excellent flavor at home?
A: According to the person in charge of a coffee shop, the knowledge about brewing coffee needs to be fully mastered. Interpreting the essence of coffee requires at least one year of complete professional training, but there is no such training environment in China at present. If you want to brew a good cup of instant coffee at home, here is a little secret recipe for you. First, put some warm milk into the pot, then add some coffee powder and boiling water (the ratio is about 3g coffee powder and 140cc boiling water), and heat it to a little boiling (be careful not to completely boil it).