Factors That Affect Fluid Needs
Various factors can increase or decrease the amount of fluid your body needs to function at its best.
Birth Sex
Compared with people born female, those born male generally need more fluid to support their increased body mass, lower average body fat, and increased calorie burn each day.
Body Weight
Hydration needs are influenced by the surface area of the body, metabolic rate, and body weight, per a paper published in the July 2016 Annals of Family Medicine. As a result, as body weight increases, fluid needs increase as well, notes the University of Missouri System.
Life Stage
Similarly, when someone is pregnant, they require additional fluids to maintain amniotic fluid levels and keep the baby growing steadily, as PennState discusses. If you’re nursing a growing baby, you’ll need to drink more fluids so that your body can make enough milk, according to the Academy of Nutrition and Dietetics.
Diet Quality
As the Mayo Clinic points out, the foods you eat will also affect your hydration and the amount of fluid you’ll need to drink. For example, if you get ample fruits and veggies each day (both of which are packed with hydrating fluid), you won’t need to gulp down as much water.
Soup is another food that is fluid-rich and can help you meet your target water intake.
If you eat a lot of these foods each day, you won’t need to drink quite as much. But if your fruit and vegetable intake is low on any given day, a few extra glasses of water will compensate for the fluid you’ll miss.
Activity Level
When you sweat during exercise or on a hot summer day, you’ll need to replace the fluids you’ve lost by drinking more H2O. As the American College of Sports Medicine points out, the intensity and duration of exercise affects how much you sweat and your subsequent fluid needs. According to a study published in Sports Medicine in March 2017, genetics and how accustomed you are to a given climate can also influence sweat volume.
Unfortunately, calculating exact hydration losses from physical activity is complicated, because people sweat at drastically different rates, according to the American College of Sports Medicine. In other words, even in the exact same conditions, two people of the same gender, weight, and with similar diets will sweat differently — and thus need different amounts of fluid.
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