Why Does Coffee Taste Like Alcohol in Hot Weather?

Hot coffee can cool the body more effectively than iced coffee in summer heat, because a hot drink triggers sweating and evaporation that release heat. The article compares the two from taste perception and ice dilution, explaining why some people still choose hot coffee when outdoor temperatures approach 40°C and perceived heat passes 51°C.

Iced coffee drinkers may notice a fermented note when coffee tastes like alcohol, since cold brew and long-steeped coffee can develop such flavors. Survey data shows coffee consumption has climbed to a historic high over the past twenty-plus years, with iced coffee a standard summer order for many regulars.

In the scorching heat of summer, with temperatures approaching 40°C, would you rather pick up a glass of iced coffee or hot coffee? Most people's instinct would be to choose a cold drink to dispel the heat, yet scientific research gives the exact opposite answer: a hot beverage may actually be the truly effective way to cool down. This article explores in depth the pros and cons of iced coffee versus hot coffee in summer from the perspectives of taste perception, the principle of ice dilution, and the body's sweating and evaporation mechanism, and also analyzes why some people insist on drinking hot coffee in the blistering heat. Whether you are a loyal fan of iced coffee or a staunch supporter of hot coffee, this discussion about temperature and bodily sensation is worth a read.

The outdoor temperature has already approached 40°C, the air is both humid and stuffy, and sweat has even soaked through the seat. At a moment like this, you stand up and brew yourself a cup of steaming-hot coffee...

Wait a minute, this scene seems a bit out of place! I believe that you, reading this article right now, when you are so hot that sweat is pouring down your back, most want to do is probably stand in front of the air-conditioning vent and gulp down an ice-cold drink.

Recently, news of various high-temperature warnings has been emerging one after another, making people sigh: air conditioning, cold drinks, and Wi-Fi are simply the three essentials for survival! However, even on days when the perceived temperature exceeds 51°C, there are still people who have a special fondness for hot drinks.

Survey data shows that coffee consumption has climbed to a historic high over the past twenty-plus years, and among consumers there is no shortage of regulars who must have a cup of iced coffee every day. In midsummer, men and women on the streets holding a cup of iced coffee has long become a common sight.

Have you ever thought about why iced coffee has become a standard summer beverage?

Perhaps someone would respond like this: It's so hot—if I don't have an iced coffee, I'm going to melt!

Indeed, nowadays even the Arctic region is hot enough to wear short sleeves, so wanting to use a cold drink to dispel the momentary heat is completely human nature. At least, there are still many people who firmly believe that cold drinks quench thirst better than hot drinks.

Some might also say: Compared with hot coffee, iced coffee has better flavor and is easier to drink!

To understand this, we need to start with the differences in taste perception under different temperature conditions. Theoretically, aroma is usually more pronounced only at higher temperatures. So here's the question: why do people feel that iced coffee tastes better?

When drinking hot coffee, we can perceive the flavor evolution of the coffee from high temperature to low temperature; whereas when tasting iced coffee, the low temperature weakens the taste buds' perception of bitterness and sweetness, while instead enhancing their sensitivity to sourness.

Also, in the eyes of some people, buying iced coffee is simply being ripped off. Watching the barista frantically adding ice cubes to the cup, and after only two big sips, the coffee is almost gone, their heart suddenly turns cold.

People may wonder, why add so much ice—isn't this a disguised rip-off? So some clever customers ask the barista to add less ice, hoping to get more coffee.

Coffee Workshop previously mentioned that iced coffee's low temperature reduces the taste buds' perception of bitterness. But what is little known is that the more ice cubes there are, the faster the drink cools down, the slower the ice cubes melt, and the slower the process of the drink being diluted.

In many people's view, iced coffee is the ultimate heat reliever. But scientific research shows that hot drinks can indeed trigger the body's cooling mechanism. On the contrary, cold drinks actually make people feel hotter.

Ollie Jay of the University of Sydney once pointed out in an interview with ABC that hot drinks can bring a cooling effect, which is due to increased sweat secretion. When sweat evaporates, it takes away excess heat from the body, thereby producing a cooling sensation. The more sweat flows out, the more sweat evaporates, which means the more heat is carried away. In an experiment, researchers had exercisers drink a non-alcoholic beverage made from crushed ice, and the results showed that the cold drink actually made them feel hotter.

Whether it is iced coffee or hot coffee, it is ultimately a personal choice. Since some people like to drink hot coffee in summer, naturally some people prefer to drink iced coffee in winter.

Image source: Internet

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The above content is compiled by CoffeeHunters, a coffee news website.