Beer is made mostly of water, so at first glance, it might seem like it could help with hydration. However, the presence of alcohol complicates things. Despite its liquid content, beer is not considered a hydrating beverage. In fact, its effects on the body can contribute to dehydration.

Alcohol is a diuretic, meaning it increases urine production. When you drink beer, the alcohol in it prompts your kidneys to release more fluid than you’re taking in. This leads to a net loss of water from the body. So even though beer contains water, the diuretic effect of alcohol outweighs the hydration it provides.

The level of alcohol matters. A low-alcohol beer, such as a light beer or near-beer with less than 2 percent alcohol by volume, has less of a dehydrating effect than stronger varieties. Some studies have shown that beverages with very low alcohol content may not disrupt fluid balance significantly, especially when consumed in moderation. But once the alcohol level rises, the likelihood of dehydration increases.

Other ingredients in beer, such as sodium and sugar, can also affect hydration. Sugary or salty drinks tend to draw water out of cells, further reducing hydration. Beer typically has some level of both, depending on the type, adding to the challenge.

One important distinction is the difference between feeling refreshed and being truly hydrated. Beer might feel cooling and satisfying when consumed cold, especially on a hot day. However, the long-term effects on your fluid balance are not the same as drinking water, herbal tea, or electrolyte-rich drinks.

In short, beer is not hydrating. While it does contain water, the presence of alcohol and other compounds cancels out any significant hydrating benefit. If you’re thirsty or recovering from exercise or heat, it’s best to reach for water or a rehydrating drink. Beer may have a place in social settings or relaxation, but it should never be a replacement for proper hydration.