Is there a difference in the effect of coffee when it is cold versus when it is hot?

Is there a difference in the effect of coffee when it is cold versus when it is hot?

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  1. Hot brewed coffee when it’s cold it will taste very bitter and usually not drinkable.
    Cold brewed coffee is not bitter and tastes really good depending on the beans and roast.
    Cold brew is less acidic and if some has joint / acidity issues then cold brew is better.

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  2. If you mean by cold coffee, hot coffee that has been iced or left to sit out and get cold, then objectively no. Coffee will have the same caffeine content by volume at all temperatures in this case. (You could quibble that evaporation would make the concentration in cold coffee a little higher, but that would be mostly negligible).
    What will change is the effect on you because of the difference in how you drink cold vs. hot coffee. I know that when I have hot coffee, I tend to drink it quickly so that it’s still hot when I reach the bottom of the mug, whereas with iced coffee, I’ll sip it as a refreshing beverage. This means that I’m getting 8 ounces of coffee in about fifteen minutes when it’s hot vs. 8 ounces over the space of an hour when it’s iced.
    That means the hot coffee will affect me more quickly, giving me a greater buzz in a shorter amount of time.
    If you mean cold-brewed coffee vs traditional drip, then you should know that cold brew has less caffeine than coffee prepared hot. This is mainly due to the solubility of caffeine (2g/100mL at room temp vs. 66g/100mL at boiling), despite the length of time cold brew steeps. This older article by the Today Show demonstrates that when they tested cold brew.

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  3. First of all, previous answers have assumed “cold coffee” to mean “iced coffee.” The question is ambiguous in that way, so it could refer to iced coffee or just a cup of hot coffee that sat there for a while and got cold.
    In the case of a cup of hot coffee cooling off for a while, no, caffeine content will remain the same as it cools . The only way to lose caffeine would be extreme heat (caffeine would boil off only after all the water boils off, above 178 degrees C [1]) or rapid/extreme cooling (caffeine’s solubility in water is still far above the caffeine content in coffee, even at 25 degrees C (room temperature) [1]).
    In the case of iced coffee, objectively, no: caffeine content is the same as that of hot coffee . According to Starbucks’s website, a 16-oz cup of hot coffee contains 330 mg of caffeine; and a 16-oz cup of iced coffee contains 165 mg of caffeine. [2,3] Ice takes up approximately 50% of the volume of an iced drink from Starbucks, leaving us at precisely 330 mg per 16 oz of actual iced coffee.
    Now, subjectively, I find that I keep sipping my iced coffee more frequently and in larger amounts than I do my hot coffee. So I experience more of a kick because more of it is hitting my system at once. Most people I have spoken to report feeling this effect as well. However, you can’t say scientifically that caffeine content is any different.
    One more thing: cold-brewed coffee. Sources conflict greatly on this issue. It makes the most sense to me that cold-brewed coffee would have a slightly lower caffeine content than hot-brewed. [4] But if you steep it long enough, I suppose anything is possible.
    — References —

    Caffeine http://en.wikipedia.org/wiki/Caffeine [wikipedia]
    Bold pick of the day http://www.starbucks.com/menu/drinks/brewed-coffee/bold-pick-of-the-day?foodZone=9999 [Starbucks]
    Iced coffee http://www.starbucks.com/menu/drinks/brewed-coffee/iced-coffee?foodZone=9999#size=106510&sweetened=0 [Starbucks]
    Caribou Coffee: The Complete Caffeine Guide http://www.energyfiend.com/caribou-coffee-the-complete-caffeine-guide [Energy Fiend]

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  4. Leaving caffeine out of the equation.
    Iced coffee (not just cold) has a much stronger flavor and iced espresso is stronger yet. I enjoy iced americanos even in the winter.

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  5. There’s a difference between the effects of cold-brewed coffee vs. hot-brewed coffee: because different chemical reactions are achieved at higher temperatures, cold-brewed coffee will have a smoother caffeine effect and overall less acidity, which some people experience as part of the “kick.”
    In terms of whether there’s a difference between hot-brewed coffee served hot and hot-brewed coffee served, cold, I haven’t read of any “real” difference in effect, but I know that I turn to hot coffee for a pick-me-up, whereas iced coffee is just an all-purpose tasty beverage for me.

    Eight O’Clock

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  6. I’m not so sure about the caffeine content, but the flavors will be noticeably different. Although this statement is a bit of a no brainer, the science behind it is quite fascinating. Also given that one of the hallmarks of a high quality coffee is its ability to stay tasty as the coffee cools, this is a pretty relevant topic for coffee lovers.
    First off, your taste buds experience flavors differently as a function of temperature. (http://www.mnn.com/food/beverages/stories/why-does-room-temperature-coffee-taste-so-bad) “certain taste receptors are most sensitive to food molecules that are in the 20 to 35 degree Celsius (68 to 95 degree Fahrenheit) range — in other words, molecules that are at or just above room temperature. The taste receptors in question don’t always register molecules that are much hotter or colder than this range, and thus we don’t taste them.”
    Secondly, the flavors of a cup of coffee continue change dynamically after you’ve finished filtering the grounds from the good stuff. Some coffee professionals believe that reactions continue to occur inside of the cup after filtering, thus changing the flavor. Another important effect is the stratification of particles inside of the cup of coffee that occurs when it is allowed to sit still. Denser particles (referred to as “fines”) sink to the bottom of the cup, and lighter particles and oils float to the top. Carefully picking up a cup, as most of us do, does little to disturb that stratification and results in us sipping from the upper layers first and lower layers later. This effect occurs in espresso as well as brewed coffee, and is so pronounced in espresso that it is often recommended to be stirred before being drunk.

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  7. No, the caffeine content remains the same, it will act similarly, either hot or cold because the constituents will change. So, it just depends on your mood as to how would you like to have your coffee, Cold or Hot? Also, Cold coffee does not go well in winters, and I personally feel that
    ” Coffee tastes best when served hot!!! ” 🙂

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  8. I don’t think so, but iced coffee is typically brewed at double strength, so I’d reckon you’ll get a bit heavier of a jolt when downing 16 oz of iced coffee versus 16 oz of hot coffee.

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