Wearables now track your sweat score to optimize hydration

Your smartwatch already tells you how many steps you took. Your fitness app already counts your calories. So what is the next piece of information your body can share? The answer is simple: how much water you need to drink.

A new wave of hydration technology is arriving in gyms, running clubs, and homes around the world. These devices track sweat loss during exercise. They measure electrolytes—the minerals your body loses when you sweat. Some even estimate your personal "sweat score," a number that shows how much fluid you should drink to stay healthy.

The idea sounds useful. Athletes and people who exercise regularly do need to know how much water to drink. Staying hydrated affects your performance, your mood, and even your ability to think clearly. In hot weather or during intense workouts, dehydration happens fast. A device that gives you a personal target could help prevent problems.

But here is where the story gets interesting. Not everyone agrees these gadgets are necessary. Some doctors and fitness experts question whether the average person really needs this level of detail. Your body already sends you signals. Thirst is a powerful message. If you feel thirsty, you should drink water. Your urine color also tells a story—dark yellow means you need more water. These simple signs have worked for thousands of years.

There is also a concern about information overload. When you track everything, you can start to feel anxious. What if your sweat score seems wrong? What if you cannot meet the number the device suggests? For some people, constant data creates stress instead of solutions. The boundary between helpful information and too much information can be very thin.

The technology itself is impressive. Some devices use sensors that measure body temperature. Others analyze sweat directly from your skin. The science is real, and the data is accurate. The question is not about whether the devices work. The question is about whether you need them.

Athletes training for marathons or competing in sports might find real value here. Someone training in the desert heat, or a person with a specific health condition that affects hydration, could benefit from precise tracking. For most people who exercise casually or live in moderate climates, however, the basic signals your body sends might be enough.

The hydration tech market will likely keep growing. Companies will make devices smaller, cheaper, and more convenient. More people will try them. And that is okay. Technology is a tool. The real skill is knowing when to use it and when to trust your own body's wisdom.

What matters most is listening to your body and developing healthy habits. Whether you use a device or simply remember to drink water throughout the day, the goal is the same: feel good, perform well, and stay healthy. Sometimes the oldest advice is still the best advice. So the next time you feel thirsty, pause and think—do you really need a device to tell you to reach for water?

Inspired by reporting from BBC News.