Is Caffeine Safe?

07 Mar

Above: top left – coffee, top middle – energy drinks, top right – soda, bottom – caffeinated drinks.

While volunteering in the hospital this week, I came across an interesting situation that I feel could really affect anyone. I was instructed to not provide caffeinated drinks to patients who have tachycardia or rapid heart rate. Thinking about how caffeine stimulates the body and the mind, it is reasonable that patients with this type of arrhythmia are not allowed caffeinated drinks. It is important to control their heart rate, not to speed it up any further with caffeinated drinks.

Although the doctor only prohibited caffeine use by the tachycardia patients, the reason behind her restriction prompted me, a college student who consumes too much coffee, to reevaluate the effects of caffeine on the body of a healthy person. Is caffeine really safe for everyone to consume? Is it harmful to increase one’s heart rate often by consuming caffeinated drinks such as soda, coffee, and energy drinks? These questions led me to search for some answers.

Dr. David Katz, a physician at Yale University, provided the answer to the question of what are the health dangers of caffeinated drinks like Red Bull and whether these beverages are safe to consume. According to Dr. Katz, the amount of caffeine in an 8 oz can of Red Bull could be dangerous to people with heart arrhythmias, high blood pressure, and sensitivity to caffeine because of caffeine’s stimulating effect on the body. However, it is reassuring to know that a can of Red Bull or a strong cup of coffee, both of which contain about 80mg of caffeine, should be safe for a healthy person to consume. In fact, an individual may consume up to approximately 350mg of caffeine everyday without any danger to health.

Even though 350mg of caffeine can be consumed safely, it is not safe to indulge in too much coffee, soda, or energy drinks. The amount of caffeine in these beverages vary widely and it is easy to consume too much of these products, leading to a caffeine overload and damaging side effects. For example, five cups of coffee with a total of 400mg of caffeine can produce nervousness, irritation, tremulousness, and insomnia. Despite the fact that caffeine is safe to consume for healthy people, Dr. Katz still advises consumption of this stimulant in moderation.

In the same article on MSN Health, Dr. Katz expresses his concern with combining caffeinated drinks with alcoholic drinks. Dr. Katz explains that more and more young people are drinking caffeinated drinks to stay awake in order to consume more alcohol. Preventing the body from turning on the protective mechanism of falling asleep to prevent further ingestion of alcohol could lead to excessive consumption of this sedative substance. Overdosing in alcohol can be extremely dangerous and potentially lethal. Dr. Katz’s concern reminded me an article a few months ago about the banning of several caffeinated alcoholic drinks by the FDA. This ban reflects Dr. Katz and many other scientists’ concern on the safety of mixing caffeinated drinks with alcohol. Research into the harmful side effects of these two substances resulting from their pharmacological interactions, facilitated overdosing in alcohol, and the physical injuries resulting from their ingestion all point to the need to regulate these drinks.

According to CNN’s article “Companies stop shipping 7 caffeine-alcohol drinks” published a few months ago, seven caffeinated alcoholic beverages were taken off the market by their respective manufactures amid warnings from U.S. Food and Drug Administration claiming that these drinks were unsafe and pose a public health concern. Caffeinated alcoholic beverages, such as Four Loko, Joose, and Moonshot, had become increasingly popular among teenagers and young adults, replacing the pure alcoholic drink and pure caffeinated energy drinks. Despite their rapid rise to popularity, until recently few research studies had been down on whether this combination of a stimulant and sedative could pose a danger to health. With the FDA claiming that the labeling of these caffeinated alcoholic drinks as dangerous to health was based on expert studies showing that caffeine can mask certain subjective experiences of alcohol consumption, thus preventing the drinker from realizing the extent of his intoxication, it gives rise to question of whether caffeine and alcohol really interact with each other to impair the drinker’s judgment of his intoxication level.

In their 2006 research study titled “Effects of Energy Drink Ingestion on Alcohol Intoxication”, Ferreira et al. found that when taken together, caffeine can reduce the perception of certain symptoms such as headaches, dry mouth, and impaired motor movements caused by alcohol consumption. Ferreira et al.’s well-desired randomized study tested the effect of vodka alcohol alone, caffeinated energy drink Red Bull alone, and combined vodka and Red Bull ingestion in 26 research participants. Subjective tests such as participants’ perception of their degree of intoxication and objective tests on breath alcohol concentration, visual reaction time, and motor coordination were then given to each test subject.

Ferreira et al. observed that although the subjects sensed reduced symptoms of alcohol intoxication, their objective tests indicate that they are just as impaired as when they were taking alcohol alone in both motor coordination and reaction time. Similarly, the blood alcohol concentration did not change whether caffeine is added to the alcoholic drink of not. Therefore, it can be concluded with a scientific basis that caffeine does interact with alcohol and the resulting impairments could pose a health risk. Furthermore previous studies by the authors suggest that this impairment might be due to caffeine’s ability to decrease the depressant effects of alcohol.

For fun…food for thought.
Cartoon: insomnia caused by caffeine
Above: Cartoon by Jason Love. This cartoon illustrates one of the side effects of caffeine use, insomnia.


Posted by on March 7, 2011 in In our food...


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4 responses to “Is Caffeine Safe?

  1. brittdubs

    March 18, 2011 at 10:22 pm

    Because you refer to articles that you’ve found, I think it would be good to hyperlink to the original. You only include the link at the bottom, but I think it would be good for readers to be able to access the source immediately. You could also block quote the sections of the articles you find particularly important/interesting or vital to your argument.

  2. Ellen Moeller

    March 21, 2011 at 1:32 pm

    I have thought about this topic many times during my long nights hyped up on caffeine in the library. While I don’t need it to get through the day, it certainly does help, and I am a much happier person after having my morning cup of coffee. But the mixture of alcohol and caffeine does scare me. I’m not going to lie, I drank drinks like Four Loko a few times when they was legal–we’re all tired at the end of the week and what better way to stay awake and still go out? But the health problems are concerning and I do not plan on mixing caffeine and alcohol in the future. I agree that it might be helpful to have links to your articles.

  3. Tina Wu

    March 21, 2011 at 6:09 pm

    I thought this post was really interesting as I function on caffeine. I can’t function without caffeine, and even if I have a full 8 hours of sleep I still drink a large coffee from Alpine or Von der Hayden. Its funny because caffeine Ive head had a double edge sword with headaches (that I’ve heard). Once when I had a horrible headache, my roommate told me “go drink some soda, it helps”…being skeptical I looked this up, and I found that this was true! (caffeine constricts blood vessels) But as your post mentioned, too much caffeine is harmful (causing alcohol withdrawals)! It makes me wonder about 5 hour energy (and those types of drinks) and if there are any harmful affects that they can produce.

  4. wbrody

    March 21, 2011 at 6:17 pm

    Really good choice of article as caffeine is being questioned more and more as new beverages come out. Once of the best examples is what Ellen noted in Four Loko. Most people drank it because its effects were immediately noticeable. It gave you energy but at the same time had played the same role as any other alcoholic beverage. I’m pretty sure most people understood how bad the drink was for your health, but at the same time it did not stop people consuming.

    Something I am always curious about is the buyer beware notion. Should consumers be able to decide whatever it is they would like to drink, or should there be limitations in place given what we know about there effects?


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