Hydration: It’s Not Just Water
When it comes to taking care of your health, hydration is easy to overlook—but it matters. Water helps regulate body temperature, maintain blood volume, support digestion, and keep your brain, heart, kidneys, and muscles functioning properly.
And as we get older, staying on top of hydration becomes even more important. Thirst may not always be a reliable signal to drink enough, so making hydration part of your daily routine is a smart habit.
So, how much water should you drink?
There isn’t one magic number that works for everyone. Your fluid needs depend on your body size, activity level, environment, diet, and how much you sweat.
A simple rule of thumb to get started is:
Aim for roughly ½ of your body weight in ounces of fluids per day.
For example, if you weigh 160 pounds, a reasonable starting point would be around 80 ounces of fluids per day.
Think of this as a starting point—not a hard-and-fast rule. You may need more when you’re exercising, sweating heavily, spending time in hot or humid weather, or recovering from an illness.
The National Academies’ recommendations also recognize that water comes from both beverages and the foods we eat, so your total daily water intake isn’t necessarily the same as the amount you need to drink. National Academies: Dietary Reference Intakes for Water
But hydration isn’t just about water!
Here’s the part that often gets overlooked: electrolytes matter too.
Electrolytes such as sodium, potassium, magnesium, and calcium help regulate fluid balance and play important roles in nerve and muscle function.
When you sweat, you lose both water and electrolytes. If you’re exercising for longer periods, working out in the heat, or sweating heavily, replacing fluid without considering electrolytes may not fully replace what you’ve lost.
This is especially relevant during:
💦 Longer or harder workouts
☀️ Hot or humid weather
🥵 Heavy sweating
🤒 Vomiting or diarrhea
🚶♀️ Increased physical activity
When your sweat losses increase, electrolytes—particularly sodium—can become a useful part of your hydration strategy.
Don’t wait until you’re thirsty!
One of the easiest ways to improve your hydration is to make it a habit rather than something you think about only when you’re thirsty.
Start with roughly ½ your body weight in ounces of fluids per day. Drink consistently throughout the day, and increase your intake when activity, heat, or sweating increases.
And remember:
Hydration isn’t just about how much you drink. It’s about replacing what your body actually loses.
Water + electrolytes + consistency = a better hydration strategy.
If you have heart, kidney, or blood-pressure concerns, take medications that affect fluid or electrolyte balance, or have been instructed to limit sodium or fluids, talk with your healthcare provider before significantly increasing your fluid or electrolyte intake.
References
National Academies of Sciences, Engineering, and Medicine. Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate. National Academies Press. 2005.
Popkin BM, D’Anci KE, Rosenberg IH. Water, hydration, and health. Nutrition Reviews. 2010;68(8):439–458. doi:10.1111/j.1753-4887.2010.00304.x.
Institute of Medicine. Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate. National Academies Press. 2005.
