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Paljonko saunominen kuluttaa nestettä kehosta – ja miksi nestetasapaino saunassa on tärkeää

How much fluid does sauna bathing consume from the body – and why fluid balance in the sauna is important

Sauna bathing is an essential part of well-being. It relaxes, cleanses and refreshes, but at the same time it affects the body's fluid balance . Sweating is a natural part of sauna bathing, and as a result, the body loses a significant amount of water and minerals. In this article, we will tell you how much fluid sauna bathing consumes from the body , what it means for well-being and how to avoid dehydration in the sauna .

How much fluid does the body lose in a sauna?

Fluid loss varies from person to person, but is also affected by the sauna temperature, humidity, and duration of sauna use. On average:

  • A 15–20 minute sauna session consumes approximately 0.5–1 liter of fluid.
  • A 30–40 minute sauna session can consume up to 1.5 liters or more
  • If you take several saunas, the total fluid loss can reach 2–3 liters.

In a sauna, the body temperature rises, and sweating acts as a cooling mechanism for the body. Fluid loss is often as much as during light exercise. Therefore, sauna bathing and dehydration are closely related.

What else besides water is removed when taking a sauna?

Sweat removes water from the body, but also important salts and minerals such as sodium, potassium, magnesium and calcium.
A healthy person's body can easily replace these through diet and water, but if you use saunas frequently, for a long time, or in particularly hot conditions, it is a good idea to supplement electrolytes .

Mineral water or a sports drink can help restore the body's salt balance, especially when sauna bathing is part of an active lifestyle or takes place in hot weather.

Drinking after sauna use – how much water should you drink?

Proper hydration is the most important part of safe and enjoyable sauna bathing. You should always drink water after sauna bathing , but it is also a good idea to drink small amounts of water before and even during sauna bathing.

Recommendation:

  • Before the sauna: 2–3 dl of water or other liquid
  • During sauna bathing: small amounts as needed
  • After the sauna: at least 0.5–1 liter of water (or more if you feel dry)

There is no need to drink too much water, but it is worth listening to your body's signals carefully. If you feel tired, dizzy or have a headache after a sauna, it may be a sign of mild dehydration .

How do you know if your fluid balance is okay?

The color of your urine is a good indicator: a light color indicates adequate hydration.
If your urine is dark and you feel weak, you should increase your fluid intake and immediately avoid alcohol, which dehydrates the body even more.

Fluid balance in a sauna means, in practice, that sweating and fluid replacement remain in balance - this way the body recovers faster and sauna bathing feels good.

Sauna bathing and recovery – why hydration is also important for well-being

Sauna bathing is an excellent way to relax and recover from the stresses of everyday life. The heat increases blood circulation, boosts metabolism, and helps remove toxins.
To ensure that the body benefits from this in the best possible way, it is important to ensure adequate fluid and mineral intake .

Athletes and active people often use saunas to support recovery precisely because of these effects – and then replacing fluids is especially important.

Summary: How much fluid does sauna use and how can it be replaced?

The average fluid loss in a sauna is 0.5–1.5 liters , sometimes even more.
To keep sauna bathing safe and enjoyable, it is important to drink enough water before and after the sauna, and if necessary, consume electrolytes or mineral water.

When the fluid balance in the sauna is maintained, you will also feel light, relaxed and refreshed after the sauna - exactly how a Finnish sauna should be.

Tip: Finish your sauna evening with a refreshing Sauna Menthol sauna ice. The cooling effect of menthol makes breathing easier and refreshes the body – the perfect addition to a relaxing sauna experience.

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