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Why Do I Get White Lines on My Body and Clothes After a Workout?

Dark running shirt with visible white salt marks after a long workout, showing electrolyte loss through sweat
electrolytes3 min read

How Salt Is Made — And Why It Matters Here

Do you know where we get common salt from?

Well, the largest source of salt is the salty water from the oceans and seas. But we do not directly pour this salty seawater into our food, right? We use powdered salt & this powdered salt comes from processing seawater at saltpans.

Traditional Indian saltpan with white salt crystals forming as seawater evaporates, illustrating how sweat leaves salt behind on skin and clothes

Seawater is let into these pans & once the sun and winds help the seawater evaporate, a white layer of leftover salts and minerals appears in the saltpan.

This also answers the prime question we are asking here: Why do you get white lines on your body and clothes after a workout!

What Are Those White Lines?

Those white lines are nothing but the salts or electrolytes that are left behind after your sweat has evaporated from the surface of your skin and your clothes.

As it turns out, your body has electrically charged salts called electrolytes in your body. They are responsible for a host of functions and are crucial for endurance sports athletes.

Now when you sweat, your body is not only losing fluids but these salts as well. If you are utilising moisture wicking fabrics, your sweat is constantly being transported to the outer surface of your attire where the sun and wind help the fluid evaporate, quite similar to the water in the saltpan.

When the fluid content evaporates, all that is left behind are the salts or electrolytes which form a white patch or layer on your skin and/or your attire.

This occurrence is quite common among people who workout for long durations and also people who are salty sweaters. This is completely natural and there is nothing to be worried about. The only thing you have to do is replenish these lost salts.

To do that, you will need to calculate how much sodium you are losing through sweat. Now this will require a sweat test which might not be possible. The one way around it is to figure out if you are a “salty sweater” and need to consume a greater amount of electrolytes as compared to a “not-so-salty sweater”.

Who Is a Salty Sweater?

The tell-tale signs to figure this out are:

  • You are left with white patches or lines on your attire after you workout or exercise.

  • Your sweat tastes salty and burns when it comes in contact with your eyes or any cuts and bruises.

  • You crave salty foods after a hard workout.

These are a few signs that indicate that you are a “salty sweater” and need to replenish electrolytes a bit more than others.

How to Replenish What You Lose

Close up of an athlete adding Ascend electrolyte powder to a bottle of water, indicating that the athlete has finished their workout and will now rehydrate to replenish electrolyte levels.
  1. Before your workout: Mix 1 sachet of Ascend electrolytes in 500ml of chilled water and start sipping on it 1 hour before you begin.

  2. During your workout: Consume 1-2 sachets every 45 - 60 minutes of activity, mixed in 500 ml - 1 litre of chilled water. The longer and harder the session, the more important it is to stay hydrated.

  3. After your workout: Have 1 sachet within 30 minutes of finishing to restore electrolyte balance and enhance recovery.

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