Coffee is one of the most popular drinks in the world. It’s enjoyed by millions each day, and it has become a symbol of a lot of big countries like the U.S.A, as well as a staple in our diets all over the world. But despite its popularity, many people are unaware that caffeine can affect their bodies in significant ways.

Caffeine chemistry formula

In this article, we’ll explore what makes coffee so special and how to maximize its benefits while minimizing any negative effects on your health.

Caffeine in coffee: Approximately 95% of adults consume caffeine daily.

Coffee is the most common source of caffeine, with 68% of Americans drinking it on any given day. Caffeine is also found in tea (green and black), chocolate, energy drinks, certain medications and supplements, and some soft drinks.

Cups of caffeine drinks

Coffee is the world’s most widely consumed psychoactive substance, but many people are unaware of its addictive properties.

While it is true that coffee, tea and other caffeinated beverages are all natural sources of caffeine, they are not harmless. Caffeine can be highly addictive. Some people have a hard time stopping it even when they know it’s bad for them. If you’re one of these people who finds yourself unable to say no to coffee even when you’re feeling jittery or overstimulated by your daily dose of caffeine—or if you’ve tried to quit but experienced withdrawal symptoms like headaches and fatigue—it may be time to consider kicking the habit once and for all.

Caffeine addiction

The good news? Withdrawing from caffeine doesn’t have to mean giving up your favourite morning ritual forever; there are ways that you can gradually reduce your consumption so that quitting feels more manageable than ever before. The idea behind this approach is that by reducing your consumption gradually over time, your body will become accustomed to the new amount of caffeine that it’s receiving and you won’t experience any withdrawal symptoms.

Morning brew

Caffeine can have a notable impact on anxiety and depression.

Caffeine has been shown to have positive effects on mental health in a variety of ways: It can help people feel more alert, awake, and focused. This can be especially helpful for people who suffer from fatigue and drowsiness due to depression or anxiety disorders.


A well-known study found that when compared to a placebo at lower doses (50 mg), 200 mg of caffeine caused less fatigue in participants who were not diagnosed with psychiatric disorders. The dose was even higher (300 mg) for those who had been diagnosed with a psychiatric disorder but still showed benefits in reducing fatigue when compared to a placebo.

Caffeine in coffee: Happy consumer

While this may seem counterintuitive since caffeine is known for being an energizing substance, it’s important to remember that everyone is different—and what works for one person may not work for another.

For adults, the FDA says consuming up to 400 milligrams daily is not generally associated with negative effects. But some research suggests limits for many people should be lower than that.

While caffeine isn’t addictive in the same way that nicotine or alcohol is, some people can develop a dependence on it—and there’s no clear consensus on what’s considered too much. Some (of many) studies have found that more than 400 milligrams per day can cause insomnia and high blood pressure.

Insomnia and high blood pressure

A review published in 2017 by researchers at the University of North Carolina School of Medicine found a “small” increase in risk for heart disease among those who consumed more than 700 milligrams of caffeine each day; other studies have found an association between heavy caffeine consumption and depression and anxiety disorders as well as increased risk for stroke and other cardiovascular diseases among women who drank six or more cups of coffee each day—something is known as the “J-shaped curve.”


Doctors recommend that pregnant women limit caffeine intake to less than 200 mg per day.

The American College of Obstetricians and Gynecologists recommends that pregnant women limit their caffeine intake to less than 200 milligrams (mg) per day. This is about 2 cups of coffee or 4 cups of black tea, but would also mean the consumption of fewer than 2 cans of energy drink and only 1 cup of chocolate. 200 milligrams of caffeine is also found in 2 cups of green tea.

Pregnant woman

Caffeine in coffee: Drinking coffee has been linked to a lower risk of developing multiple diseases.

  • Type 2 diabetes
  • Parkinson’s disease
  • Liver cancer
  • Heart disease
  • Stroke
So, how much coffee should you drink?

The research suggests that the more coffee you drink, the lower your risk of heart disease and stroke. The ACSH report says that up to three cups a day is okay for most people. But even moderate amounts of caffeine can lead to problems like insomnia and restlessness if you still haven’t gotten a full understanding of your body and what it needs. A logical and loving answer would be choosing balance and logical decision-making based on scientific research.

Caffeine in coffee: Chemex

Chronic use of caffeine can cause headaches and withdrawal symptoms when the person stops taking it suddenly.

  • Headaches
  • Fatigue
  • Irritability

Caffeine withdrawal symptoms can also include:

  • Increased blood pressure and heart rate (for some people)
  • Diarrhoea, nausea, or vomiting
  • Dizziness

Coffee drinker

Some headache research suggests that caffeine can be an effective pain reliever for some people when taken in combination with pain relievers such as aspirin or acetaminophen (Tylenol). 

Scientists believe that caffeine works as a mild analgesic by blocking adenosine, a chemical in your brain that causes pain and inflammation. Caffeine also stimulates the release of endorphins—the body’s natural opiates—and increases blood flow to the brain, which reduces pain and swelling.

Brain skeleton

Caffeine will not relieve severe headaches that come on suddenly, but it may help prevent or reduce milder headaches. For example, if you get migraines once or twice a week, taking 200 milligrams of caffeine about 30 minutes before bedtime could help prevent them from happening again during the next 24 hours.

In addition to its well-known effects on alertness and mood, caffeine has numerous other biological effects.

Caffeine increases the rate of breathing and heart rate, raises blood pressure and may also increase blood flow to skeletal muscles.

The effect of caffeine on alertness and mood is related to its ability to mimic a class of substances called adenosine receptor antagonists (receptors are proteins that transmit information within cells). This action prevents adenosine from binding with the receptors in neurons.

Adenosine chemical

Adenosine is released when you’re tired or stressed out, causing your body to relax by making you feel drowsy—a state known as being “in the zone.” So when you drink coffee before a night out, it can make you feel ready for action instead of sluggish like most people are feeling at that time.

However, there’s also evidence suggesting that increased adenosine levels in your brain lead directly to better performance in memory tasks involving short-term memory or working memory which explains why people often turn towards caffeine after sleeping poorly all night long. It’s no coincidence.

Morning brew

Caffeine in coffee: The amount of caffeine in your cup of coffee depends on several factors.

The type of coffee beans used can make a big difference in how much caffeine you get from your cup.

Which has more caffeine, light or dark roast?

Light roast coffee is roasted for less time, so this factor makes it denser and heavier than dark roast. As a result, each particle of ground light roast contains more caffeine than a particle of ground dark roast. For example, when equal volumes are measured, the light roast will thus pack more caffeine. However, the grind size will also affect your brew’s caffeine potency: finer grounds will allow more water through them at once, leading to higher concentrations in each sip.

Fine ground

A darker roast also makes for stronger flavour notes, that’s why intuitively one may think that darker roasts have more caffeine due to the bold flavours and jolt they get when taking a sip. However, many have contended that lighter roasts are more caffeinated because the caffeine burns off in the roasting process. Darker roasts have less caffeine than lighter ones because the bean’s surface area is exposed for longer periods of time during roasting and therefore leaches more potential caffeine out of itself as it cooks into oblivion.


It’s important to remember that this only applies if you’ve chosen a light or medium roast; dark-roasted coffees can still be quite high in terms of their overall amount of milligrams per serving size (and are often recommended by doctors as alternative sources for those who want something stimulating but don’t want all the health risks associated with energy drinks).

Bean roasts

Also worth noting here: Finely ground coffee will contain more dissolved solids because there aren’t any spaces between each particle through which those solids may escape; this means that finely ground coffee will generally contain higher levels of both soluble components like polysaccharides along with any remaining unwanted particulates (like pebbles) along with whatever else might’ve gotten mixed up during processing!


Caffeine in coffee: Roasting techniques can significantly affect how much caffeine is contained in a cup of coffee.

It’s key to know that the amount of caffeine in your cup depends on how the coffee is brewed as well. There are many tactics for extracting the maximum amount of caffeine with different types of brewing methods.


Roasting time: The longer a coffee bean is roasted, the more caffeine it loses.

Roasting temperature: Higher temperatures during roasting lead to lower caffeine content in finished beans.

Roasting method: French and Italian roast methods use higher temperatures than American-style roasts, which leads to less caffeine in your cup of joe.


If you’re used to drinking coffee, it’s probably fine for your health. If you’re thinking about starting to drink coffee or switching from tea or soda, keep in mind that there are pros and cons to both options.

Caffeine free

It’s important to have a balanced perspective on caffeine consumption so that you can make informed decisions about how much is right for you. At the end of the day, what matters is to drink responsibly.


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