What is the difference between iced coffee and hot coffee?

Many people like to drink coffee. Some people mainly like hot coffee, while others like cool iced coffee. The weather is so cold recently that there should be more people who like to drink hot coffee. So what's the difference between hot coffee and iced coffee, and what effect will it have on our health?

It is generally believed that hot coffee contains more caffeine. But under the same size, the caffeine content of hot coffee and iced coffee is the same.

Hot coffee is made by putting coffee extract into hot water, while iced coffee is made by adding ice cubes into water. That's all the difference. However, although the content is the same, the caffeine concentration of iced coffee is the highest before the ice melts.

It feels that caffeine in hot coffee is easier to absorb, but there is no difference in caffeine absorption rate between hot coffee and iced coffee. Because no matter what the temperature is, it will soon become the same temperature as the body temperature of the stomach after drinking. So if you drink the same amount, it will probably take the same time to have an awakening effect.

The wake-up effect of caffeine varies according to the speed (time) and concentration (concentration) of your drink. For example, if you drink a strong espresso, you should feel the effect of caffeine as soon as possible.

Although it varies from person to person, relatively speaking, the total time for drinking coffee when drinking hot coffee is shorter than that for drinking iced coffee. So when drinking hot coffee, the wake-up effect will be slightly stronger. Because the same content is ingested in a shorter time. Moreover, the cold stimulation of iced coffee can also inhibit the excitement of caffeine sympathetic nerve, so the contrast effect is more obvious.

The taste of coffee is mainly bitter and sour. Although caffeine also plays a role in this taste, it mainly plays a role in various phenolic compounds such as chlorogenic acid. In addition, if there is a lot of browning during baking, it will also increase the bitter components. Acidity varies according to the kind of coffee beans.

Generally speaking, drinking cold drinks will feel bitter and sour, and drinking hot drinks will feel sweet. For example, like melting ice cream, it feels sweeter. This is because the activity of taste buds changes with the temperature.

Therefore, the same concentration of iced coffee, bitter and sour will be stronger. However, at high temperature, aroma particles diffuse more actively, so the aroma of iced coffee is lighter, while the aroma of hot coffee will be stronger.

The ingredients of iced coffee and hot coffee are the same, but there are still some differences. This is aimed at' cold extracted coffee (also called iced coffee)', which is obviously different from hot coffee. Iced coffee means "cold brewing" in English, which means extracting with cold water.

First of all, the acidity of cold extracted coffee is about 3 times lower than that of hot water extracted coffee extract. This is because less phenolic compounds are extracted at low temperature. So it can reduce the irritation to the stomach and the fear of tooth coloring. In addition, because of the slow extraction, it contains various fine ingredients, which makes the flavor stronger. However, phenolic compounds are antioxidant components that are beneficial to the body, so less extraction may not be a good thing.

If you are sensitive to caffeine or have a bad sleep, you should be careful when drinking any kind of coffee. Especially hot coffee is not only high in acidity but also very hot, and people with bad stomach need to pay more attention.

Coffee has different effects on the body according to the method of making, the temperature of making and the speed of drinking. Even so, we can't judge which temperature of coffee is more conducive to health. There are many kinds of coffee, so you can only choose according to your own preferences. Similar but different iced coffee and hot coffee are actually just coffee.