Can Smart Bottles Stop Kidney Stones From Returning?

Kidney stones cause very sharp pain and often send people to the emergency room. In the United States, about 1 in 11 adults will get a stone, and almost half of them will get another one later.

A big clinical trial led by the Urinary Stone Disease Research Network and organized by the Duke Clinical Research Institute wanted to know if a special program could help people drink enough water to keep stones from coming back.

The results were published in The Lancet. They show why stopping stones is hard, even when patients are motivated and receive extra help.

Smart Bottles and Coaching Did Not Cut Stone Recurrence

Study volunteers were split into two groups. One group received normal care. The other got a hydration program that used Bluetooth‑enabled water bottles, personalized drinking goals, reminder texts, small cash rewards, and health coaching.

Each person’s “fluid prescription” was set by comparing their usual urine output with the amount needed to reach at least 2.5 L of urine per day.

People in the program did drink more water and produced more urine, but the increase was not enough to lower the number of new or growing kidney stones across the whole group.

Largest Behavioral Study of Its Kind

The trial included 1,658 teenagers and adults from six major U.S. centers (UT Southwestern, Washington University, University of Pennsylvania/Children’s Hospital of Philadelphia, University of Washington, Mayo Clinic, and Cleveland Clinic). Researchers followed participants for two years, checking for new stones with surveys and imaging.

Why Staying Hydrated Is So Tough

The study shows how difficult it is for anyone to consistently drink large amounts of fluid every day, even with gadgets and coaching. One single water target may not fit everyone because needs change with age, body size, activity level, and health.

"Instead of giving every patient the same goal, we should find out who benefits from which target, learn why people stop following the plan, and create better behavioral and medical tools," said a study investigator.

Moving Toward Personalised Prevention

Future work may involve more individual drinking goals, ways to beat daily‑routine barriers, and medicines that keep stone‑forming minerals dissolved in urine.

"Most people would love a simple method to lower their chance of another painful episode," a researcher added.

The study, and other work from the Urinary Stone Disease Research Network, was funded by the National Institute of Diabetes and Digestive and Kidney Diseases.