It is generally believed that hot coffee contains more caffeine. But under the same size, the caffeine content in hot coffee and iced coffee is the same.
Hot coffee is made by putting coffee extract into hot water, while iced coffee is made in water with ice cubes. The difference is nothing more than that. However, although the content is the same, the caffeine concentration of iced coffee is the highest before the ice melts.
I feel 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 take about the same time to have an awakening effect.
The awakening effect of caffeine is different according to how fast (time) and how much (concentration) you drink. For example, when you drink a strong espresso in one gulp, you should feel the caffeine effect as soon as possible.
Although it varies from person to person, relatively speaking, the total time for drinking coffee is shorter when drinking hot coffee than iced coffee. Therefore, when drinking hot coffee, the awakening effect will be slightly stronger. Because the same content was ingested in a shorter time. Moreover, the cold stimulation of iced coffee can also inhibit the excitement of caffeine's 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 like chlorogenic acid. In addition, if a lot of browning occurs in the baking process, it will also increase the bitter ingredients. According to the kind of coffee beans, the acidity is also different.
Generally speaking, if you drink cold drinks, you will feel bitter and sour, while if you drink hot drinks, you will feel sweet. For example, just like melting ice cream feels sweeter. This is because the activity of taste buds varies according to the temperature.
Therefore, if iced coffee is made with the same concentration, the bitterness and acidity will be stronger. However, the aroma particles diffuse more actively at high temperature, 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 for' cold extracted coffee (also called iced coffee)', and the difference is obvious compared with hot coffee. Iced coffee means' cold brew' 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 coffee extract extracted with hot water. This is because less phenolic compounds will be extracted at low temperature. Therefore, it can reduce the irritation of the stomach and the fear of tooth coloring. In addition, because it is extracted slowly, it contains all kinds of fine ingredients, which makes the flavor stronger. But phenolic compounds are antioxidant components that are beneficial to the body, so it is not necessarily a good thing to extract less.
If you are sensitive to caffeine or can't sleep well, you should also be careful when drinking any kind of coffee. In particular, hot coffee is not only high in acidity but also hot, so people with poor stomachs 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 tell which temperature of coffee is more beneficial to our 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.