What Happens in the Brain and Body When You Develop Alcohol Dependence

According to the video, the pleasure of drinking arises because alcohol suppresses excitation in the central nervous system, that is, the brain and nerves, while also acting on the reward system involved in pleasure. The result is a distinctive sense of relaxation and euphoria. At the same time, this beverage has many downsides, and the video presents alcohol dependence as one example.

The symptoms of alcohol dependence it lists include being unable to limit how much you drink, cutting back on important social or occupational activities in order to drink, experiencing withdrawal symptoms, and continuing to drink even while knowing it is causing problems.

Why do people become hooked on alcohol? The video describes the mechanism as "remarkably logical." In the early stages of drinking, alcohol repeatedly stimulates the reward system, bringing euphoria and relief from anxiety. This becomes imprinted in the brain as "alcohol = a positive experience," leading to cravings for drinking and the formation of a habit.

Later, once someone has become dependent and tries to quit, they are hit by withdrawal symptoms such as sleep disturbances, physical illness, discomfort, and mental distress. To escape that suffering, they reach for a drink again. The video describes alcohol dependence as a "downward spiral" brought about by alcohol's negative side.

The video points out that the symptoms of alcohol dependence are often misunderstood. Medically, it is defined by the presence of at least 2 of 11 symptoms within a 12-month period. Summarizing a few of them: "often consuming alcohol in larger amounts or over a longer period than intended," and "having a strong desire, urge, or craving to consume alcohol." A person who meets these two criteria is medically classified as having mild dependence, according to the video.

In other words, the video explains, dependence does not refer only to trembling hands or a collapsed social life; it spans a spectrum depending on the severity of symptoms.

Because it is so familiar, alcohol's dangers tend to go unrecognized, but the video says that when viewed as "a drug that acts on the brain," it is a rather vicious chemical. As evidence, it cites a study that evaluated 20 drugs, including alcohol, heroin, cocaine, and methamphetamine, for the harm they cause to users themselves and to others. In this study, alcohol ranked first by a wide margin with a score of 72, followed by heroin at 55 and crack cocaine at 54.

When alcohol is consumed, several distinct reactions occur in the brain, the video explains.

One is the activation of GABAA receptors. This strengthens inhibitory signals and suppresses brain excitation. Another is the inhibition of NMDA receptors, which suppresses excitatory signals and also contributes to effects such as impaired short-term memory. In addition, alcohol triggers dopamine release in the ventral striatum, including the nucleus accumbens, which reinforces drinking.

The video restates this in plain terms. Drinking amplifies the action of GABAA receptors, the brain's brakes, forcibly inducing a relaxed state, while suppressing the action of NMDA receptors, the accelerator, dulling judgment, blurring memory, and bringing you closer to what we call being drunk. This experience is then learned by the brain as "something that feels good" through dopamine, leading to the next drink.

Why can't people quit even when they know it's poison? The video names two factors that cannot be ignored.

The first is the low social barrier. Alcohol is available 24 hours a day at any convenience store or supermarket, and TV commercials are full of images portraying drinking as a positive experience. In such an environment, the video says, it is clearly difficult to break free of alcohol's grip.

The second is the downward spiral of drinking and quitting. The human brain reportedly has a tendency for neural excitability to increase each time it goes through a cycle of drinking, withdrawal, and drinking again, worsening future withdrawal symptoms. This concept is called "kindling," and the video identifies it as one of the major reasons people cannot escape alcohol's grip.

Once dependent, a person is constantly driven by the desire to consume alcohol, and attempts to resist fail. Abuse can leave them unable to fulfill important roles at work, school, or home. Alcohol is always at the center of their life, and they may even abandon social activities. Even so, they cannot stop drinking, and a great deal of time comes to be spent solely on obtaining and drinking alcohol, the video describes.

Even a firm resolve of "I can't go on like this, I'm going to quit drinking" is stubbornly resisted by alcohol, the video says. That resistance takes the form of withdrawal symptoms.

Severity varies, but mild to moderate symptoms begin within a few hours of stopping drinking, as early as within 6 hours. These include shaking hands, headaches, physical weakness, uncontrollable sweating, and nausea. Some people may have convulsive seizures; the video stresses that these are alcohol withdrawal seizures and something entirely different from a mere hangover.

In more severe cases, people may experience auditory hallucinations, such as hearing voices condemning them. In some cases, they may fall into confusion, insomnia, terrifying nightmares even when they do sleep, profuse sweating, and severe depression, and fear-inducing hallucinations may occur repeatedly. Once someone is in deep, the video's view is that parting ways with alcohol is by no means easy.

On physical damage, the video mentions effects on the liver such as steatohepatitis and cirrhosis, and then states that alcohol is also linked to at least seven types of cancer. Specifically: cancers of the mouth, pharynx, larynx, esophagus, liver, and colorectum, and in women, breast cancer. The video's point is that alcohol is not only bad for the liver but may raise the risk of cancer in various parts of the body.

Finally, the video considers why people become hooked on alcohol from the perspective of evolutionary biology. Alcohol originally arises as a volatile liquid when sugars in natural fruit are fermented by yeast, and it evaporates and disperses into the air even at room temperature. As a result, the presence of alcohol signals that ripe fruit, a source of energy, is nearby.

There is reportedly a theory that, in ancient times, humanity's distant tree-dwelling ancestors relied on this scent to search for high-calorie ripe fruit and came down to the ground. The video says that if this hypothesis is correct, it would be fair to say that a signal to crave and be captivated by alcohol is inscribed in human DNA. This desire may have been useful when alcohol was a scarce and precious natural resource, but it is not adapted to the modern era, in which alcohol can be bought anywhere for pocket change. The video suggests, as speculation, that the true nature of alcohol dependence may be a tragedy born of this evolutionary mismatch.

The video acknowledges that alcohol is an appealing drink that enhances the joy of food, enriches communication between people, and sometimes fills lonely hours spent alone. It goes on to say, however, that if the distance is misjudged, it turns into a highly addictive poison. Calling alcohol "humanity's most beloved poison," the video closes by expressing the hope that viewers will continue to keep an appropriate distance from it.