An isotonic drink is a drink that has the same salt sugar content with our body fluids' sugar salt. With the concentration equation, the given fluid pressure will be the same with the pressure of body fluids, which also affects the speed of absorption.
Anytime our body fluids are lost due to daily activities.
An ion is a part of an electrolyte, the mineral salts that are naturally present in our body. Electrolytes in our bodies will break down into ions, both positive and negative, which are important in helping all the processes happening in our body. These electrolytes cannot be produced by the body itself, so they have to be replenished through the intake of food / drinks.
Our body fluid is salty in taste (e.g. tears and sweat).
In general, isotonic drinks consists of water-sugar-salt, as well as oral rehydration salts. The function of salts in isotonic drinks is to replace body ions that are lost along with the fluids, so that the fluid balance between water and ions is maintained. If we only drink water, the electrolyte levels in the body becomes too diluted causing the body to get rid of excess fluids. This can cause the body to become dehydrated (Voluntary Dehydration).
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