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Can protein powder cause dehydration?

It is important to note that protein powder itself does not cause dehydration. However, if protein powder is consumed without adequate fluid intake, it can contribute to dehydration.

Protein is a macronutrient that requires water for proper digestion and utilization. When protein powder is consumed, it requires fluids to be broken down and absorbed by the body. Inadequate fluid intake can result in reduced hydration levels, leading to dehydration.

Research has shown that adequate fluid intake is important for individuals who consume high-protein diets or supplements, including protein powders. A study published in the Journal of the International Society of Sports Nutrition found that high-protein diets can increase urinary output, which can lead to dehydration if fluids are not adequately replenished (1).

In addition, some protein powders may contain added ingredients, such as caffeine or diuretics, which can contribute to dehydration. It is important to carefully read the ingredient label of any protein powder before use and to ensure adequate fluid intake throughout the day.

Overall, while protein powder itself does not cause dehydration, it is important to consume it with adequate fluid intake to prevent dehydration.


  1. Judelson DA, et al. Effect of hydration state on resistance exercise-induced endocrine markers of anabolism, catabolism, and metabolism. Journal of the International Society of Sports Nutrition. 2014;11:18.
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