Why don the results for my Estimated Total Daily Hydration Needs change when I change the weight input?
Although the Hydration Calculator asks for your weight in the first screen, this information is only used to generate results in the second section of tool, which examines how factors related to physical activity affect hydration needs. Changing the Calculator’s weight input while exploring the exercise-related hydration section will affect the results. On the other hand, results for the first part of the tool, which estimates basic (non-exercise related) hydration needs do not change when the weight input is changed. This is because the basic or general hydration results are is based on the 2004 Adequate Intake (AI) recommendations for water developed by the U.S. Institute of Medicine (IOM) — which varies only with age and gender. The IOM recommendations estimate the amount of water from food and beverages in the diet that will provide adequate hydration for healthy, inactive individuals living in temperate climates in the U.S.
