Is milk good for rehydration?
A dehydrated athlete needs to drink fluid to replace sweat losses. Fluids that contain electrolytes, such as milk, help the body to absorb more fluids. Milk contains about the same amount of sodium as other sports drinks and it is just as effective as commercial sports drinks or water for rehydration. It also contains other electrolytes (e.g. potassium), which help the body to absorb and retain fluid.
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For effective rehydration, fluid intake should replace sweat losses. Electrolyte-containing fluids ensure greater retention of fluids in the body. Milk and liquid dairy foods provide the body with a great source of water and electrolytes. The sodium concentration of milk is similar to that of other sports drinks, with several studies showing that it is equally effective (or even better) than commercially prepared sports drinks or water for rehydration. Milk also contains additional electrolytes such as potassium, which will assist in fluid absorption.