On any summer afternoon, the beaches and terraces are filled with people seeking refuge from the high temperatures, and the instinct of the vast majority is to order a cold beer. This classic drink in Spain gives a false sensation of immediate coolness and temporary relief, but here the question we must ask ourselves is: is it really useful to drink it to alleviate the sensation of heat?
A myth. Given this classic scene, science suggests that it is a bad idea to have a beer to quench thirst, since alcohol causes exactly the opposite by triggering a response that dehydrates us. And this is explained by a fundamental hormone called vasopressin or antidiuretic hormone.
As its name indicates, its function is to retain water in the kidneys when the body needs it because it is dehydrated, and alcohol suppresses it almost immediately. And it is something proven, since studies show that ethanol blocks the release of vasopressinpointing out that after ingesting alcohol, an acute drop in this hormone is observed in the bloodstream. This causes the kidneys to stop reabsorbing fluids and begin to expel water at a rapid rate to promote the production of urine and, therefore, the loss of fluids.
an experiment key here demonstrated that the subjects studied lost up to 0.9 kg of water weight in just two hours. That is, for every beer you drink to “hydrate” your body expels more liquid than it consumes. And this is a context of heat and high sweating; It is a one-way ticket to a state of dehydration if you do not also drink water.
The broken thermostat. The second big problem with drinking alcohol in the sun is thermal. Alcohol is a powerful vasodilator and this means that it widens the blood vessels, bringing more blood to the surface of the skin, which produces that typical facial flushing and sudden feeling of heat when we drink. And although at first the breeze on the skin may make us feel cooler, we are actually compromising our ability to regulate internal temperature.
A model published in International Journal of Legal Medicine demonstrated that drinking alcohol before facing a high temperature environment drastically worsens the body’s response. Alcohol literally “hacks” the brain nuclei responsible for thermoregulation, activating abnormal responses of the body to heat.
Water is the best. Drinking a cold beer has logically become socially rooted in our society, but when you are thirsty and have been sweating for a long time, it is best to hydrate with water first. And this also confirms that there is no alcohol that is “safe” from a medical point of view.
Non-alcoholic beer can be an option since, since it is composed mainly of water and lacks alcohol, it does not have an effect on our antidiuretic hormone.
Images | Nicolas Postiglioni
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